Metal-Loaded Zeolite Catalysts for the Halogen-Free Conversion of Dimethyl Ether to Methyl Acetate

Abstract

A catalyst for the carbonylation of dimethyl ether to methyl acetate. The catalyst comprises a zeolite, such as a mordenite zeolite, at least one Group IB metal, such as copper, and/or at least one Group VIII metal, such as iron, and at least one Group IIB metal, such as zinc. Such a catalyst with combined metals provides enhanced catalytic activity, improved stability, and improved selectivity to methyl acetate, and does not require a halogen promoter, as compared to a metal-free or copper only zeolite.

Claims

1-60. (canceled)

61. A method of treating a catalyst comprising: (i) an ammonium or acidic or protonated form of a zeolite; (ii) at least one Group IIB metal; and (iii) at least one metal selected from the group consisting of Group IB metals and Group VIII metals, consisting essentially of contacting said catalyst with a gas comprising oxygen and an inert gas.

62. The method of claim 61 wherein said zeolite is selected from the group consisting of mordenite zeolites, zeolite Beta, ferrierite, zeolite Y, ZSM-5, ZSM-23, ZSM-35, and ZSM-57.

63. The method of claim 62 wherein said zeolite is a mordenite zeolite.

64. The method of claim 61 wherein said at least one metal selected from the group consisting of Group IB metals and Group VIII metals is at least one Group IB metal.

65. The method of claim 64 wherein said at least one Group IB metal is copper.

66. The method of claim 61 wherein said at least one metal selected from the group consisting of Group IB metals and Group VIII metals is at least one Group VIII metal.

67. The method of claim 66 wherein said at least one Group VIII metal is iron.

68. The method of claim 66 wherein said at least one Group VIII metal is palladium.

69. The method of claim 61 wherein said at least one Group IIB metal is zinc.

70. The method of claim 61 wherein said at least one metal selected from the group consisting of Group IB metals and Group VIII metals, and said at least one Group IIB metal are present in said catalyst at a molar ratio of Group IB metal and/or Group VIII metal to Group IIB metal of from about 0.01 to about 20.

71. The method of claim 70 wherein said at least one metal selected from the group consisting of Group IB metals and Group VIII metals, and said at least one Group IIB metal are present in said catalyst to a molar ratio of Group IB metal and/or Group VIII metal to Group IIB metal of from about 0.1 to about 5.

72. The method of claim 61 wherein said catalyst comprises: (i) a zeolite; (ii) at least one Group IIB metal; (iii) at least one Group IB metal; and (iv) at least one Group VIII metal.

73. The method of claim 72 wherein said at least one Group VIII metal is selected from the group consisting of palladium, platinum, and nickel.

74. The method of claim 61 wherein said catalyst is free of halogens and halogen-containing compounds.

75. The method of claim 61 wherein said inert gas is helium.

76. The method of claim 61 wherein said catalyst is heated to a temperature of from about 20 C. to about 800 C.

77. The method of claim 76 wherein said catalyst is heated to a temperature of from about 20 C. to about 550 C.

78. The method of claim 61 wherein said oxygen is present in said gas in an amount of from about 1 vol. % to about 20 vol. %.

79. The method of claim 78 wherein said oxygen is present in said gas in an amount of from about 5 vol. % to about 15 vol. %.

80. The method of claim 79 wherein said oxygen is present in said gas in an amount of about 10 vol. %.

81. The method of claim 75 wherein said helium is present in said gas in an amount of from about 80 vol. % to about 99 vol. %.

82. The method of claim 81 wherein said helium is present in said gas in an amount of from about 85 vol. % to about 95 vol. %.

83. The method of claim 82 wherein said helium is present in said gas in an amount of about 90 vol. %.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0077] The invention now will be described with respect to the drawings, wherein:

[0078] FIG. 1 is a graph showing the conversion of dimethyl ether over time on stream in the presence of NH.sub.4-MOR (Example 1), Cu/NH.sub.4-MOR (Example 2), 1.3Cu-1Zn/NH.sub.4-MOR (Example 3), 1Cu-2.6Zn/NH.sub.4-MOR (Example 4), and 1Cu-3.5Zn/NH.sub.4-MOR catalysts (Example 5). 50.8% CO/2.4% DME/3.11% H.sub.2/43.69% He, 15 ml/min (STP), 0.3 g catalyst, 20 bar, 210 C., inert-exclusive WHSV (STP) 2.1 h.sup.1;

[0079] FIG. 2 is a graph showing the selectivity towards methyl acetate, methanol, and others (oxygenates and hydrocarbons) for the catalysts and reactions in FIG. 1;

[0080] FIG. 3 is a graph showing the methyl acetate productivity for the catalysts and reactions in FIG. 1;

[0081] FIG. 4 is a graph showing the conversion of dimethyl ether over time on stream in the presence of 1Cu-2.6Zn/NH.sub.4-MOR catalysts that were subjected to full reduction (Example 4), half reduction (Example 6), or no reduction (Example 7);

[0082] FIG. 5 is a graph showing the selectivity towards methyl acetate, methanol, and others (oxygenates and hydrocarbons) for the catalysts and reactions of Examples 4, 6 and 7;

[0083] FIG. 6 is a graph showing the methyl acetate productivity for the catalysts and reactions of Examples 4, 6 and 7;

[0084] FIG. 7 is a graph showing the effect of in situ regeneration at 20 bar hydrogen on dimethyl ether conversion for a 1.3Cu-1Zn/NH.sub.4-MOR catalyst (Example 8), 50.8% CO/2.4% DME/3.11% H.sub.2/43.69% He, 15 mL/min (STP), 0.15 g catalyst, 20 bar, 220 C, inert-exclusive WHSV (STP) 4.1 .sup.1;

[0085] FIG. 8 is a graph showing the selectivity towards methyl acetate, methanol, and other oxygenates and hydrocarbons for the regeneration procedure in FIG. 7;

[0086] FIG. 9 is a graph showing the methyl acetate productivity for the regeneration procedure in FIG. 7;

[0087] FIG. 10 is a graph showing the conversion of dimethyl ether over time on stream for the 1Cu-1Zn/HMOR catalyst synthesized via a dry impregnation method (Example 9). 93% CO/5% He/2% DME at 15 mL/min (STP), 0.3 g catalyst, 10 bar, inert-exclusive WHSV (STP) 3.6 h.sup.1;

[0088] FIG. 11 is a graph showing the selectivity towards methyl acetate, methanol, and to other oxygenates and hydrocarbons for the catalyst and reaction in FIG. 10;

[0089] FIG. 12 is a graph showing the methyl acetate productivity over time on stream for the catalyst and reaction in FIG. 10;

[0090] FIG. 13 is a graph showing the conversion of dimethyl ether over time on stream for Cu/Na-MOR (Example 10), 1Cu-1Zn/Na-MOR (Example 12), and 2Cu-1Zn/Na-MOR (Example 13). 50.8% CO/2.4% DME/3.11% H.sub.2/43.69% He, 15 mL/min (STP), 0.3 g of catalyst, 20 bar, 230 C., inert-exclusive WHSV (STP) 2.1 h.sup.1;

[0091] FIG. 14 is a graph showing the selectivity towards methyl acetate, methanol, and to other oxygenates and hydrocarbons over reaction time for the catalysts and reactions in FIG. 13;

[0092] FIG. 15 is a graph showing the methyl acetate productivity for the catalysts and reactions in FIG. 13;

[0093] FIG. 16 is a graph showing the conversion of dimethyl ether over time on stream for a 2Cu-1Zn-0.3Pd/Na-MOR catalyst (Example 14). 93% CO/2% DME/5% He at 15 mL/min (STP), 0.3 g of catalyst, 10 bar, inert-exclusive WHSV (STP) 3.6 h.sup.1;

[0094] FIG. 17 is a graph showing the selectivity towards methyl acetate, methanol, and other oxygenates and hydrocarbons over time on stream for the catalyst and reaction in FIG. 16; and

[0095] FIG. 18 is a graph showing the methyl acetate productivity for the reaction and catalyst in FIG. 16;

[0096] FIG. 19 is a graph showing the conversion of dimethyl ether over time on stream for NH.sub.4-MOR, Fe(II)/NH.sub.4-MOR (Example 16), 3Fe(II)-1Zn/NH.sub.4-MOR (Example 17), and 1Fe(II)-1Zn/NH.sub.4-MOR (Example 18) catalysts. 50.0% CO/2.39% DME/2.86% H.sub.2/44.75% He, 15 mL/min (STP), 0.3 g of catalyst, 20 bar, 210 C., inert-exclusive WHSV (STP) of 2.1 h.sup.1.

[0097] FIG. 20 is a graph showing the selectivity towards methyl acetate, methanol, and to other oxygenates and hydrocarbons over time on stream for the catalysts and reactions in FIG. 19;

[0098] FIG. 21 is a graph showing the methyl acetate productivity for the catalysts and reactions in FIG. 19;

[0099] FIG. 22 is a graph showing the conversion of dimethyl ether over time on stream for H-MOR with a Si/Al ratio of 6.5 (Example 19), hierarchical H-MOR with a Si/Al ratio of 10.2 (Example 20), and hierarchical H-MOR with a Si/Al ratio of 15.4 (Example 21). 50.0% CO/2.39% DME/2.86% H.sub.2/44.75% He at 15 mL/min (STP), 0.2 g (Example 19), 0.3 g (Example 20), or 0.468 g (Example 21) of catalyst, 20 bar, 210 C.;

[0100] FIG. 23 is a graph showing the selectivity toward methyl acetate, methanol, and to other oxygenates and hydrocarbons over time on stream for the catalysts and reactions in FIG. 22;

[0101] FIG. 24 is a graph showing the methyl acetate productivity for the catalysts and reactions in FIG. 22;

[0102] FIG. 25 is a graph showing the conversion of dimethyl ether over time on stream for H-MOR with a Si/Al ratio of 6.5 (Example 19), hierarchical H-MOR with a Si/Al ratio of 7.7 (Example 22), and hierarchical H-MOR with a Si/Al ratio of 8.6 (Example 23). 50.0% CO/2.39% DME/2.86% H.sub.2/44.75% He at 15 mL/min (STP), 0.2 g (Example 19), 0.232 g (Example 22), and 0.254 g (Example 23) of catalyst, 20 bar, 210 C.;

[0103] FIG. 26 is a graph showing the selectivity toward methyl acetate, methanol, and to other oxygenates and hydrocarbons over time on stream for the catalyst and reactions in FIG. 25;

[0104] FIG. 27 is a graph showing the methyl acetate productivity for the catalysts and reactions in FIG. 25;

[0105] FIG. 28 is a graph showing the conversion of dimethyl ether over time on stream for 1Cu-4Zn/NH.sub.4-MOR (Example 24) and Zn/NH.sub.4-MOR (Example 25). 50.0% CO/2.39% DME/2.86% H.sub.2/44.75% He, 15 mL/min (STP), 0.3 g of catalyst, 20 bar, 210 C., inert-exclusive WHSV (STP) of 2.1 h.sup.1;

[0106] FIG. 29 is a graph showing the selectivity towards methyl acetate, methanol, and to other oxygenates and hydrocarbons over time on stream for the catalysts and reactions in FIG. 28;

[0107] FIG. 30 is a graph showing the methyl acetate productivity for the catalysts and reactions in FIG. 28;

[0108] FIG. 31 is a graph showing the conversion of dimethyl ether over time on stream for hierarchical 3Fe-1Zn/NH.sub.4-MOR with a Si/Al ratio of 8.6 (Example 26), 93% CO/2% DME/5% He, 15 mL/min (STP), 0.15 g of catalyst, 20 bar, 210 C., inert-exclusive WHSV (STP) of 7.2 h.sup.1;

[0109] FIG. 32 is a graph showing the selectivity towards methyl acetate, methanol, and to other oxygenates and hydrocarbons over time on stream for the catalyst and reaction in FIG. 31; and

[0110] FIG. 33 is a graph showing the methyl acetate productivity for the catalyst and reaction in FIG. 31.

EXAMPLES

[0111] The invention now will be described with respect to the following examples; it is to be understood, however, that the scope of the present invention is not intended to be limited thereby.

[0112] In the following examples, three different iterations of mordenite are used. The sodium-exchanged form (Na-MOR) was converted to the NH.sub.4-MOR form via liquid-based ion-exchange using ammonium nitrate, as described in Example 1. The NH.sub.4-MOR form was converted to the H-MOR form in situ, as described in Example 1.

[0113] The carbonylation reaction was carried out using a Micromeritics Autochem 2950 HP. The catalyst was loaded into a stainless steel tube with an inner diameter of 7.5 mm and a wall thickness of approximately 1 mm. Quartz wool was loaded into the stainless steel tube before and after the sample. This tube was mounted into the Autochem 2950 HP with the thermocouple positioned so that it was touching the outside of the stainless steel sample tube. The internal valves of the Autochem 2950 HP were kept at a constant temperature of 110 C. except for the sampling valve which is kept at a constant temperature of 150 C.

[0114] Pretreatment of the catalyst was conducted in the same stainless steel tube prior to a reaction. Pretreatment was conducted at slightly above atmospheric pressure. Typical pretreatment consisted of a high temperature calcination using a gas containing oxygen. This calcination may be followed by no further treatments prior to reaction. Further treatments include/but were not limited to high temperature treatment in pure inert gas or reduction in a hydrogen-containing gas at high temperature. After pretreatment, the catalyst was stored under inert gas until used in the reaction.

[0115] The Autochem 2950 HP was attached to a Pfeiffer Vacuum Thermostar GSD 320 T1 mass spectrometer. The capillary tube was maintained at a temperature of 200 C. and inlet maintained at a temperature of 120 C.

[0116] Prior to each reaction, the mass spectrometer was calibrated using the reactant mixture for carbon monoxide, dimethyl ether, helium, and hydrogen with helium being used as the internal standard for calibration and amounts based on what is reported for the cylinder by Praxair. The mass points used for determination of the concentration of relevant species were 2 amu for H.sub.2.4 amu for He, 12 amu for CO, 32 amu for MeOH, 46 amu for DME, and 74 amu for MeOAc.

[0117] When running a reaction, the stainless steel tube was heated to the reaction temperature and allowed to stabilize for approximately 30 minutes. After recalibration of the Thermostar GSD 320, the reactant gas is directed to flow through the stainless steel tube containing the catalyst and the system is pressurized to the desired reaction pressure. A general mass spectrum stair scan was started using the Thermostar GSD 320 set to measure the raw ion current for 0 to 74 amu. The raw ion current data then was converted to concentrations and molar flow rates using the calibration constants given by the Thermostar GSD 320 software.

[0118] The conversion of dimethyl ether as depicted in the figures was calculated as the fraction of the total dimethyl ether (DME) that is reacted, or:

[00001]$X_{\mathrm{DME}}=\frac{\begin{array}{c}\mathrm{Molar}.Math..Math.\mathrm{flow}.Math..Math.\mathrm{of}.Math..Math.\mathrm{DME}.Math..Math.\mathrm{in}.Math..Math.\mathrm{inlet}.Math..Math.\mathrm{gas}-\\ \mathrm{Molar}.Math..Math.\mathrm{flow}.Math..Math.\mathrm{of}.Math..Math.\mathrm{DME}.Math..Math.\mathrm{in}.Math..Math.\mathrm{effluent}\end{array}}{\mathrm{Molar}.Math..Math.\mathrm{Flow}.Math..Math.\mathrm{of}.Math..Math.\mathrm{DME}.Math..Math.\mathrm{in}.Math..Math.\mathrm{inlet}.Math..Math.\mathrm{gas}}$

[0119] Selectivity towards the desired products methyl acetate (MeOAc) and methanol (MeOH) was calculated based on their molar flow rates in the effluent gas and the total molar amount of dimethyl ether which was converted:

[00002]$S_{\mathrm{MeOAc}}=\frac{\mathrm{Molar}.Math..Math.\mathrm{flow}.Math..Math.\mathrm{of}.Math..Math.\mathrm{MeOAc}.Math..Math.\mathrm{in}.Math..Math.\mathrm{effluent}}{\begin{array}{c}\mathrm{Molar}.Math..Math.\mathrm{flow}.Math..Math.\mathrm{of}.Math..Math.\mathrm{DME}.Math..Math.\mathrm{in}.Math..Math.\mathrm{inlet}.Math..Math.\mathrm{gas}-\\ \mathrm{Molar}.Math..Math.\mathrm{flow}.Math..Math.\mathrm{of}.Math..Math.\mathrm{DME}.Math..Math.\mathrm{in}.Math..Math.\mathrm{effluent}\end{array}}$$S_{\mathrm{MeOH}}=\frac{\mathrm{Molar}.Math..Math.\mathrm{flow}.Math..Math.\mathrm{of}.Math..Math.\mathrm{MeOH}.Math..Math.\mathrm{in}.Math..Math.\mathrm{effluent}}{2\left(\begin{array}{c}\mathrm{Molar}.Math..Math.\mathrm{flow}.Math..Math.\mathrm{of}.Math..Math.\mathrm{DME}.Math..Math.\mathrm{in}.Math..Math.\mathrm{inlet}.Math..Math.\mathrm{gas}-\\ \mathrm{Molar}.Math..Math.\mathrm{flow}.Math..Math.\mathrm{of}.Math..Math.\mathrm{DME}.Math..Math.\mathrm{in}.Math..Math.\mathrm{effluent}\end{array}\right)}$

[0120] In order to account for dimethyl ether not converted to methyl acetate or methanol, selectivity to others was calculated assuming 1:1 molar stoichiometry of DME to the unidentified products. The amount of other products was calculated as the difference between the amount of dimethyl ether that has been reacted and the amounts of methyl acetate and methanol in the feed. The raw ion profiles from the mass spectrometer also were considered when determining the selectivity to others. The selectivity towards other compounds is calculated as:

[00003]$S_{\mathrm{others}}=\frac{\begin{array}{c}\mathrm{Molar}.Math..Math.\mathrm{flow}.Math..Math.\mathrm{of}.Math..Math.\mathrm{DME}.Math..Math.\mathrm{in}.Math..Math.\mathrm{inlet}.Math..Math.\mathrm{gas}-\\ \mathrm{Molar}.Math..Math.\mathrm{flow}.Math..Math.\mathrm{of}.Math..Math.\mathrm{DME}.Math..Math.\mathrm{in}.Math..Math.\mathrm{effluent}-\\ \mathrm{Molar}.Math..Math.\mathrm{flow}.Math..Math.\mathrm{of}.Math..Math.\mathrm{MeOAc}.Math..Math.\mathrm{in}.Math..Math.\mathrm{effluent}-\\ 0.5\mathrm{Molar}.Math..Math.\mathrm{flow}.Math..Math.\mathrm{of}.Math..Math.\mathrm{MeOH}\end{array}}{\begin{array}{c}\mathrm{Molar}.Math..Math.\mathrm{flow}.Math..Math.\mathrm{of}.Math..Math.\mathrm{DME}.Math..Math.\mathrm{in}.Math..Math.\mathrm{inlet}.Math..Math.\mathrm{gas}-\\ \mathrm{Molar}.Math..Math.\mathrm{flow}.Math..Math.\mathrm{of}.Math..Math.\mathrm{DME}.Math..Math.\mathrm{in}.Math..Math.\mathrm{effluent}\end{array}}$

[0121] Selectivity to others thus includes unidentified hydrocarbons, oxygenates, as well as coke left on the catalyst. Mass balance with respect to DME was closed below 5% error. At the conditions reported in the examples below, no acetic acid was produced or detected on analysis.

Example 1Production and Testing of Metal-Free NH.SUB.4.-MOR Catalyst

[0122] Received Na-MOR was washed and dried overnight in an oven at 60 C. before being used in the liquid-based ion-exchange process. An NH.sub.4-MOR catalyst was produced by liquid phase ion exchange of Na-MOR (Zeolyst International, Si/Al ratio of 6.5) in 1M NH.sub.4NO.sub.3 solution at 70 C. for 3 hours, followed by filtration, washing with deionized water, and drying overnight in an oven at 60 C. The ion exchange procedure was repeated 4 times with fresh 1M NH.sub.4NO.sub.3 solutions. The catalyst was denoted as NH.sub.4-MOR.

[0123] The catalyst was calcined in situ prior to the catalytic reaction in order to convert to H-MOR. The calcination was performed stepwise in a 10% O.sub.2/90% He gas mixture to avoid sieve damage by steaming at 110 C. for 3 hours, 350 C. for 1 hour, and 550 C. for 3 hours, followed by treatment for 2 hours in He at 650 C. The catalyst then was tested in a reaction mixture of 50.8% CO/2.4% DME/3.11% H.sub.2/43.69% He at 15 ml/min (STP). 0.3 g catalyst at 20 bar total pressure at 210 C. and an inert-exclusive WHSV (STP) of 2.1 h.sup.1. The results of the reaction are shown in FIGS. 1 through 3. The catalyst shows a short lifetime before being deactivated: as the catalyst deactivated, the formation of methanol and other oxygenates and hydrocarbons were favored equally while the selectivity towards methyl acetate decreased.

Example 2. Production and Testing of Cu/NH.SUB.4.-MOR Catalyst

[0124] The NH.sub.4-MOR material was produced as described in Example 1. It then was ion-exchanged further using 0.2 M Cu(NO.sub.3).sub.2 aqueous solutions. The ion exchange was repeated 4 times to achieve a 2.6 wt % Cu loading, as per neutron activation analysis (NAA) of the final dried powders.

[0125] The catalyst was calcined in situ prior to the catalytic reaction to convert the NH.sub.4-MOR to H-MOR. The calcination was performed step-wise in a 10% O.sub.2/90% He mixture to avoid sieve damage by steaming at 110 C. for 3 hours, 350 C. for 1 hour, and 550 C. for 3 hours. The temperature then was lowered to 400 C., followed by metal reduction in 10% H.sub.2/90% Ar for 20 min at 400 C. and for 1 hour at 550 C. The temperature then was lowered to 400 C., the flow was switched to He and returned to ambient temperature, followed by the catalytic test.

[0126] This catalyst was tested in a reaction mixture of 50.8% CO/2.4% DME/3.11% H.sub.2/43.69% He at 15 mL/min (STP), 0.3 g of catalyst at 20 bar total pressure at 210 C., and an inert-exclusive WHSV (STP) of 2.1 h.sup.1. The results for the reaction are shown in FIGS. 1 through 3. The catalyst has high peak dimethyl ether conversion but deactivates quickly. The selectivity towards methyl acetate drops substantially as the catalyst deactivates with the favored product during deactivation being methanol.

Example 3Production and Testing of 1.3Cu-1Zn/NH.SUB.4.-MOR Catalyst

[0127] The NH.sub.4-MOR catalyst was prepared as described in Example 1. This catalyst then was ion exchanged using 0.089M Cu (NO.sub.3) and 0.111 M Zn(NO.sub.3).sub.2 aqueous solutions. The ion exchange was repeated 4 times to achieve a 1.8 wt. % Cu loading and a 1.4 wt. % Zn loading, per neutron activation analysis (NAA) of the final dried powders.

[0128] The catalyst was calcined, reduced in situ, and tested in DME carbonylation as described in Example 2. The results are presented in FIGS. 1 through 3. As shown, a very high peak conversion (100%) was achieved as compared to the highest peak conversion of the H-MOR form of approximately 65%. The selectivity towards methyl acetate also was maintained at a very high level (approximately 100%) during the entirety of reaction even as the catalyst had begun to deactivate.

Example 4. Production and Testing of 1Cu-2.6Zn/NH.SUB.4.-MOR Catalyst

[0129] The NH.sub.4-MOR material was produced as described in Example 1. It was ion-exchanged further using 0.033M Cu(NO.sub.3).sub.2 and 0.167M Zn(NO.sub.3).sub.2 aqueous solutions; the ion-exchange was repeated 4 times to achieve a 0.9 wt % Cu loading and a 2.4 wt % Zn loading (as per NM of the final dried powders).

[0130] The catalyst was calcined in situ prior to the catalytic reaction to convert to the H-MOR. The calcination was performed stepwise in a 10% O.sub.2/90% He gas mixture to avoid sieve damage by steaming, at 110 C. for 3 hours, 350 C. for 1 hour, and 550 C. for 3 hours. The temperature then was lowered to 400 C. followed by metal reduction in 10% H.sub.2/90% Ar for 20 min. at 400 C. and for 2 hours at 650 C. The temperature then was lowered to 400 C., the flow was switched to He and returned to ambient temperature, followed by the catalytic test.

[0131] The catalyst was tested in DME carbonylation as described in Example 2. The results are presented in FIGS. 1 through 3. The additional zinc has a substantial stabilizing effect on the catalyst, extending the catalyst lifetime to over 50 hours without regeneration. While some methanol is formed at the very start of reaction, the main product during the entire time of reaction is methyl acetate with a selectivity near 100%. As the catalyst deactivated, the primary product of reaction still was methyl acetate with the high selectivity of nearly 100% maintained.

Example 5 Production and Testing of 1Cu-3.5Zn/NH.SUB.4.-MOR Catalyst

[0132] The NH.sub.4-MOR material was produced as described in Example 1. It was ion-exchanged further using 0.023M Cu(NO.sub.3).sub.2 and 0.177M Zn(NO.sub.3).sub.2 aqueous solutions; the ion-exchange was repeated 4 times to achieve an approximate molar ratio of 1:3.5 Cu:Zn and approximate metal loading of 0.7 wt. % Cu and 2.6 wt. % Zn.

[0133] The catalyst was calcined in situ prior to the catalytic reaction to convert to the H-MOR. The calcination was performed stepwise in a 10% O.sub.2/90% He gas mixture to avoid sieve damage by steaming, at 110 C. for 3 hours, 350 C. for 1 hour, and 550 C. for 3 hours. The temperature then was lowered to 300 C., the flow was switched to He and returned to ambient temperature, followed by the catalytic test.

[0134] The catalyst was tested in DME carbonylation as described in Example 2. Results are presented in FIGS. 1 through 3. The additional zinc has a substantial stabilizing effect on the catalyst, extending the catalyst lifetime to over 90 hours without regeneration. While some methanol is formed at the very start of reaction, the main product during the entire time of reaction is methyl acetate with a selectivity near 100%. As the catalyst deactivated, the primary product of reaction still was methyl acetate with the high selectivity of nearly 100% maintained.

Example 6. Production and Testing of a 1Cu-2.6Zn/NH.SUB.4.-MOR Catalyst

[0135] The 1Cu-2.6Zn/NH.sub.4-MOR catalyst was prepared as described in Example 4.

[0136] The catalyst was calcined in situ, prior to the catalytic reaction to convert to the H-MOR. The calcination was performed stepwise in a 10% O.sub.2/90% He gas mixture to avoid sieve damage by steaming, at 110 C. for 3 hours, 350 C. for 1 hour, and 550 C. for 3 hours. The temperature then was lowered to 400 C. followed by metal half-reduction in 10% H.sub.2/90% Ar for 20 min. at 300 C. and for 2 hours at 325 C. The temperature then was lowered to 300 C., the flow was switched to He and returned to ambient temperature, followed by the catalytic test.

[0137] The catalyst was tested in DME carbonylation as described in Example 2. Results are presented in FIGS. 4 through 6 labelled as half reduction. As compared to the fully reduced sample, the peak conversion of DME is substantially higher along with a greatly increased lifetime (a lifetime of 50 hours for the fully reduced 1Cu-2.6Zn/NH.sub.4-MOR has been extended to 75 hours). While some methanol still is formed at the very start of reaction, the main product during the entire time of reaction is methyl acetate with a selectivity near 100%. As the catalyst deactivated, the primary product of reaction still was methyl acetate with the high selectivity of nearly 100% maintained.

Example 7. Production and Testing of a 1Cu-2.6Zn/NH.SUB.4.-MOR Catalyst

[0138] The 1Cu-2.6Zn/NH.sub.4-MOR catalyst was prepared as described in Example 4.

[0139] The catalyst was calcined in situ prior to the catalytic reaction to convert to the H-MOR. The calcination was performed stepwise in a 10% O.sub.2/90% He gas mixture to avoid sieve damage by steaming, at 110 C. for 3 hours, 350 C. for 1 hour, and 550 C. for 3 hours. The temperature then was lowered to 300 C., the flow was switched to He and returned to ambient temperature.

[0140] The catalyst was tested in DME carbonylation as described in Example 2. Results are presented in FIGS. 4 through 6 labelled as no reduction. As compared to the fully reduced sample, the peak conversion of DME again is substantially higher along with a greatly increased lifetime (a lifetime of 50 hours for the fully reduced 1Cu-2.6Zn/NH.sub.4-MOR has been extended to 75 hours). Compared to the half-reduced 1Cu-2.6Zn/NH.sub.4-MOR, peak conversion of DME is not as high but overall the same amount of MeOAc is produced. The behavior of this catalyst with no reduction was very similar to that of the half reduced sample described in Example 6. At the very start of reaction some MeOH is produced but the main product still is methyl acetate. As the catalyst deactivated, the primary product of reaction still was methyl acetate with the high selectivity of nearly 100% maintained.

Example 8. Regeneration of 1.3Cu-1Zn/NH.SUB.4.-MOR Catalyst

[0141] The catalyst was produced and pretreated (calcined/reduced) analogously to the procedure presented in Example 3.

[0142] This catalyst was tested in a reaction mixture of 50.8% CO/2.4% DME/3.11% H.sub.2/43.69% He at 15 mL/min (STP), 0.15 g of catalyst at 20 bar total pressure at 220 C., and an inert-exclusive WHSV (STP) of 4.1 h.sup.1. After conversion of DME had dropped to about 20% and the selectivity towards MeOAc just had begun to decrease, which occurred after approximately 19 hours, the flow of 50.8% CO/2.4% DME/3.11% H.sub.2/43.69% He was stopped and pure H.sub.2 was introduced to the reactor. After 15 min at 220 C., the temperature was increased at a rate of 1.6 C./min to 400 C. The catalyst was kept under H.sub.2 flow at 400 C. for a period of 10 hours. Hydrogen pressure was 20 bar (no regeneration could be achieved at 1 bar pressure). The reactor was depressurized and H.sub.2 flow was stopped and a flow of 10% H.sub.2/90% Ar was introduced. The catalyst was kept under 10% H.sub.2/90% Ar flow and at 400 C. for a period of 30 min before the temperature was increased to 550 C. where it was maintained for a period of 1 h. The catalyst was cooled to 400 C. and flow through the catalyst was switched to Ar. The catalyst was cooled further to the reaction temperature of 220 C. and the reaction began again. The regenerated catalyst was tested using the same 50.8% CO/2.4% DME/3.11% H.sub.2/43.69% He mixture at 15 mL/min(STP), 20 bar total pressure at 220 C., and an inert-exclusive WHSV (STP) of 4.1 h.sup.1. The regenerated catalyst was tested until conversion of DME dropped to 0%, which occurred at a time on stream of approximately 40 hours. The reaction results are shown in FIGS. 7 through 9. Prior to regeneration, the catalyst achieved a peak dimethyl ether conversion of approximately 72%. After regeneration, the peak conversion achieved was approximately 55%. As shown, after regeneration, the selectivity towards methyl acetate was maintained at a very high level (approximately 100%) with the only other by-product being very low levels of methanol.

Example 9. Production and Testing of 1Cu-1Zn/H-MOR Catalyst Via Dry Impregnation

[0143] NH.sub.4-MOR catalyst was produced as in Example 1. This NH.sub.4-MOR catalyst was converted to H-MOR by heating in a furnace at 550 C. for a period of 16 hours. Cu and Zn then were loaded onto the H-MOR via a dry impregnation process. An equimolar solution of Cu(NO.sub.3).sub.2 and Zn(NO.sub.3).sub.2 was prepared and added dropwise while stirring and ultrasonic mixing to dry H-MOR powder until 2.5 wt % (relative to total catalyst weight) was achieved for each of Cu and Zn. The catalyst was dried overnight in an oven at 60 C. to produce 1Cu-1Zn/H-MOR. The catalyst was calcined in situ in a 10% O.sub.2/90% He mixture at 550 C. followed by treatment for 2 hours in 10% H.sub.2/90% Ar at 500 C. for 2 hours. The catalyst then was tested in a reaction mixture of 93% CO/5% He/2% DME at 15 mL/min (STP), 0.3 g catalyst at 10 bar total pressure starting at a temperature of 200 C., and an inert-exclusive WHSV (STP) of 3.6 h.sup.1. The temperature was increased during the reaction to an approximate temperature of 240 C. to facilitate higher conversion. The results of the reaction are shown in FIGS. 10 through 12. A peak DME conversion of approximately 42% was achieved with very high selectivity of nearly 100% towards methyl acetate. The example shows applicability of the dry impregnation method in the catalyst production.

Example 10. Production and Testing of Cu/Na-MOR Catalyst

[0144] The Na-MOR was ion-exchanged using a 0.2 M aqueous solution of Cu(NO.sub.3).sub.2 at a volume of 50 mL/g of Na-MOR. The slurry was stirred and kept at 70 C. for 3 hours before being vacuum filtered to retrieve the catalyst. The catalyst was dried overnight at 60 C. This ion-exchange procedure was repeated 4 times to achieve a final Cu loading of 4.6 wt %.

[0145] The catalyst was calcined in situ prior to the catalytic reaction. Calcination was performed at 550 C. in a flowing dry 10% O.sub.2/90% He gas mixture for 3 hours followed by treatment in flowing 10% H.sub.2/90% Ar at 500 C. for a period of 2 hours. The catalyst was stored under He and returned to ambient temperature, followed by the catalytic test.

[0146] The catalyst was tested in a reaction mixture of 50.8% CO/2.4% DME/3.11% H.sub.2/43.69% He at 15 mL/min (STP), 0.3 g of catalyst at 20 bar total pressure at 230 C. and an inert-exclusive WHSV (STP) of 2.1 h.sup.1. The results are presented in FIGS. 13 through 15. The lifetime of the catalyst is short and selectivity towards methyl acetate begins to decrease as other products and methanol increasingly are favored.

Example 11. Production and Testing of Zn/Na-MOR Catalyst

[0147] Na-MOR was ion-exchanged using a 0.2 M aqueous solution of Zn(NO.sub.3).sub.2. The ion exchange was repeated 4 times to achieve a 4.8 wt % Zn loading, per neutron activation analysis of the final dried powders.

[0148] The catalyst was calcined in situ prior to the catalytic reaction. Calcination was performed at 550 C. in a flowing dry 10% O.sub.2/90% He gas mixture for 3 hours followed by treatment in flowing 10% H.sub.2/90% Ar at 550 C. for a period of 2 hours. The catalyst was stored under He and returned to ambient temperature, followed by the catalytic test.

[0149] The catalyst was tested in a reaction mixture of 50.8% CO/2.4% DME/3.11% H.sub.2/43.69% He at 15 mL/min (STP), 0.3 g of catalyst at 20 bar total pressure at a starting temperature of 230 C. and an inert-exclusive WHSV (STP) of 2.1 h.sup.1. The temperature was increased to 270 C. during the time on stream. This catalyst showed no activity at any of the temperatures tested, indicating that zinc alone does not facilitate the carbonylation of DME.

Example 12. Production and Testing of 1Cu-1Zn/Na-MOR Catalyst

[0150] Na-MOR then was ion-exchanged using 0.057 M Cu(NO.sub.3).sub.2 and 0.143 M Zn(NO.sub.3).sub.2 aqueous solutions. The ion exchange was repeated 4 times to achieve a 2.4 wt % Cu loading and a 2.3 wt % Zn loading, per neutron activation analysis of the final dried powders.

[0151] The catalyst was calcined, reduced, and tested in the reaction as in Example 9. The results are shown in FIGS. 13 through 15. The impact of the zinc is shown in the selectivity profiles, where the amount of other oxygenates and hydrocarbons produced during reaction is considerably lower at the end of reaction, with selectivity at the end of reaction shifting to favor methanol.

Example 13. Production and Testing of 2Cu-1Zn/Na-MOR Catalyst

[0152] Na-MOR was ion-exchanged using 0.089 M Cu(NO.sub.3).sub.2 and 0.111 M Zn(NO.sub.3).sub.2 aqueous solutions. The ion exchange was repeated 4 times to achieve a 3.1 wt. % Cu loading and a 1.7 wt. % Zn loading, per neutron activation analysis of the final dried powders.

[0153] The catalyst was calcined, reduced and tested in the reaction as in Example 9. The results are shown in FIGS. 13 through 15. The presence of produced oxygenates and hydrocarbon by-products is suppressed entirely with the only by-product of reaction being methanol. The addition of zinc is shown to have a positive stabilizing effect on the product profile during reaction.

Example 14. Production of 2Cu-1Zn-0.3Pd/Na-MOR Catalyst

[0154] Na-MOR was ion-exchanged using 0.089 M Cu(NO.sub.3).sub.2 and 0.111 M Zn(NO.sub.3).sub.2 aqueous solutions. The ion exchange was repeated 4 times to achieve a 3.1 wt. % Cu loading and a 1.7 wt. % Zn loading, per neutron activation analysis of the final dried powders.

[0155] After this procedure, a mixture of Pd(OAc).sub.2 dissolved in toluene was added dropwise to the 2Cu-1Zn/NaMOR while being stirred and sonicated. This mixture was dried overnight at 60 C. to produce a catalyst with 0.8 wt. % Pd loading as compared to total catalyst weight, forming the final 2Cu-1Zn-0.3Pd/Na-MOR catalyst.

[0156] The catalyst underwent temperature programmed reduction in situ prior to the catalytic reaction tests. Starting from ambient conditions, the catalyst was treated in 10% H.sub.2/90% Ar and heated at a rate of 10 C./min to a final temperature of 750 C. before being returned to a reaction temperature of 200 C. under a low flow of He.

[0157] The catalyst was tested in a reaction mixture of 93% CO/2% DME/5% He at 15 mL/min (STP), 0.3 g of catalyst at 10 bar total pressure at a starting temperature of 200 C. and an inert-exclusive WHSV (STP) of 3.6 h.sup.1. Temperature was increased during time on stream to a final temperature of 230 C. The results are shown in FIGS. 16 through 18. The formation of other oxygenates and hydrocarbons was suppressed during the entirety of the reaction test.

Example 15. Production and Testing of a CuZn/Al.SUB.2.O.SUB.3 .Catalyst

[0158] -Al.sub.2O.sub.3 (Sigma-Aldrich, 0.58 nm pore size, 150 mesh) was impregnated via an incipient wetness technique using solutions of Cu(NO.sub.3).sub.2 and Zn(NO.sub.3).sub.2. The powder was dried overnight in an oven at 60 C. The final catalyst contained 2.11 wt. % Cu and 2.18 wt. % Zn as compared to the total catalyst weight.

[0159] The catalyst was calcined in situ prior to the catalytic reaction. The calcination was performed by heating the catalyst to 500 C. in a flow of 10% O.sub.2/90% He gas mixture for 3 hours followed by treatment in 10% H.sub.2/90% Ar at 500 C. for 2 hours.

[0160] The catalyst then was tested in a reaction mixture of 93% CO/2% DME/5% He at 15 mL/min (STP), 0.3 g of total catalyst at 10 bar total pressure and temperature starting at 200 C. and an inert-exclusive WHSV (STP) of 3.6 h.sup.1. Temperature was increased during reaction to a fihal temperature of 420 C.

[0161] This catalyst showed no activity for DME carbonylation at any of the temperatures tested, indicating that the zeolite is necessary for the activation of reactant(s).

Example 16. Production and Testing of a Fe(II)/NH.SUB.4.-MOR Catalyst

[0162] The NH.sub.4-MOR material was produced as described in Example 1. The NH.sub.4-MOR was mixed physically with hydrated FeCl.sub.2 so as to achieve a 100% loading of Fe(II) relative to total Al content in the NH.sub.4-MOR. This physical mixture was ground together using a mortar and pestle until homogeneity was achieved and then heated in a packed bed reactor under flowing dry air to 600 C. to facilitate an oxidative solid state ion exchange. The mixture was left at 600 C. under flowing air for a period of 6 hours. The catalyst was retrieved and stored in a desiccator until it was used for carbonylation of DME. The loading of Fe(II) achieved was 3.45 wt. %, which is approximately 72% loading of Fe(II) relative to total Al content on a molar basis.

[0163] The catalyst was calcined following the procedure as described in Example 2. The catalyst was reduced in situ at a temperature of 325 C. in 10% H.sub.2/Ar for a period of 2 hours. After this reduction the flow was switched to He and the catalyst was returned to ambient temperature, followed by the catalytic test.

[0164] The catalyst was tested in a reaction mixture of 50.0% CO/2.39% DME/2.86% H.sub.2/44.75% He at 15 mL/min (STP), 0.3 g of catalyst at 20 bar total pressure at 210 C., and an inert-exclusive WHSV (STP) of 2.1 h.sup.1. The results for the reaction are shown in FIGS. 19-21. As compared to NH.sub.4-MOR, substantially higher conversion is achieved despite that the conversion does not achieve a steady state. As was seen with the CuZn/NH.sub.4-MOR catalysts, the selectivity to methyl acetate (MeOAc) is stabilized even as the catalyst begins to deactivate with the main by-product being methanol (MeOH). No other hydrocarbons were detected. MeOAc productivity achieved a relatively stable level for a period of approximately 25 hours before it began to decrease as the catalyst deactivated.

Example 17. Production and Testing of a 3Fe(II)-1 Zn/NH.SUB.4.-MOR Catalyst

[0165] The NH.sub.4-MOR material was produced as described in Example 1. The NH.sub.4-MOR was mixed physically with hydrated FeCl.sub.2 and ZnCl.sub.2 so as to achieve a 100% loading of Fe and Zn relative to total Al content in the NH.sub.4-MOR and a molar ratio of Fe:Zn of 3.1. The solid state ion exchange was conducted as described in Example 16. The loading of Fe(II) and Zn achieved was 3.00 wt. % and 1.2 wt. %, respectively, which is an approximate 83% loading of Fe(II) and Zn relative to Al content on a molar basis.

[0166] The catalyst was calcined and reduced as described in Example 16.

[0167] The catalyst was tested for DME carbonylation as described in Example 16. The results for the reaction are shown in FIGS. 19 to 21. As compared to Fe(II)/NH.sub.4-MOR, a slightly lower conversion of DME is achieved but stays at a higher level for longer. Selectivity to MeOAc is slightly better over the entirety of the reaction as compared with the Fe(II)/NH.sub.4-MOR and remains high as the catalyst deactivates. Aside from MeOH, no other hydrocarbons were detected. MeOAc productivity achieved a relatively stable level for a period of approximately 30 hours and was slightly higher as compared to Fe(II)/NH.sub.4-MOR.

Example 18. Production and Testing of a 1Fe(II)-1 Zn/NH.SUB.4.-MOR Catalyst

[0168] The NH.sub.4-MOR material was produced as described in Example 1. The NH.sub.4-MOR was mixed physically with hydrated FeCl.sub.2 and ZnCl.sub.2 so as to achieve a 100% loading of Fe and Zn relative to total Al content in the NH.sub.4-MOR and a molar ratio of Fe:Zn of 1.1. The solid state ion exchange was conducted as described in Example 16. The loading of Fe(II) and Zn achieved was 1.90 wt. % and 2:40 wt. %, respectively, which is an approximate 82% loading of Fe(II) and Zn relative to Al content on a molar basis.

[0169] The catalyst was calcined and reduced as described in Example 16.

[0170] The catalyst was tested for DME carbonylation as described in Example 16. The results for the reaction are shown in FIGS. 19 to 21. As compared to Fe(II)/NH.sub.4-MOR, a much lower conversion of DME is achieved but still higher than NH.sub.4-MOR. Selectivity to MeOAc is not as high over the entirety of the reaction as compared with the 3Fe(II)/NH.sub.4-MOR but does remain in favor of MeOAc with the only by-product detected being MeOH.

Example 19. Production and Testing of H-MOR Catalyst with a Si/Al Ratio of 6.5

[0171] The NH.sub.4-MOR material was produced as described in Example 1.

[0172] The catalyst was calcined in situ to H-MOR via stepwise increases in temperature. Under a 10% O.sub.2/90% He gas mixture, the catalyst was heated to 110 C. for 3 hours, 350 C. for 1.5 hours, and 550 C. for 3 hours. The temperature then was decreased to 325 C., active gas flow switched to pure He, and the temperature was decreased further to ambient temperature. The H-MOR contains 5.1 wt. % Al.

[0173] The catalyst was tested in a reaction mixture of 50.0% CO/2.39% DME/2.86% H.sub.2/44.75% He at 15 mL/min (STP), 0.2 g of catalyst at 20 bar total pressure at 210 C., and an inert-exclusive WHSV (STP) of 3.09 h.sup.1. The results for the reaction are shown in FIGS. 22 to 24. As was seen in Example 1, metal-free H-MOR does not survive very long in reaction, and selectivity to MeOAc decreases as the catalyst deactivates.

Example 20. Production and Testing of Hierarchical H-MOR with a Si/Al Ratio of 10.2

[0174] The NH.sub.4-MOR material was produced as described in Example 1. The NH.sub.4-MOR then was mixed with 5 M HNO.sub.3 at 50 C. at a ratio of 1 g of NH.sub.4-MOR to 50 mL of solution. The mixture was covered and stirred for one hour using a magnetic stir bar. The mixture then was vacuum filtrated to recover the solids and washed excessively with deionized water. The recovered powder was dried overnight at 60 C.

[0175] The catalyst was calcined and prepared for reaction as described in Example 19.

[0176] The catalyst was tested for DME carbonylation as described in Example 19 with the only difference being the amount of catalyst used. To maintain approximately the same amount of Al in the reactor as in Example 19, the amount of catalyst used was increased to 0.3 g which gives an inert-exclusive WHSV of 2.1 h.sup.1 (catalyst contained approximately 3.4 wt. % Al).

[0177] The results for the reaction are shown in FIGS. 22 to 24. As compared to H-MOR with a Si/Al ratio of 6.5, the catalyst is slightly more stable at the cost of reduced activity. The same decrease in selectivity to MeOAc as seen with H-MOR with a Si/Al ratio of 6.5 was seen as the catalyst deactivates.

Example 21. Production and Testing of Hierarchical H-MOR with a Si/Al Ratio of 15.4

[0178] To produce Na-MOR with a Si/Al ratio of 15.4, 3 g of Na-MOR with a Si/Al ratio of 6.5 was mixed with 50 mL of 0.55 M HNO.sub.3 and heated subsequently under reflux to the point that the mixture was beginning to boil. The mixture was stirred and left boiling for a period of one hour before it was cooled quickly and filtered to recover the solids. The recovered powder was washed excessively with deionized water. The recovered powder then was converted to NH.sub.4-MOR as described in Example 1.

[0179] The catalyst was calcined and prepared for reaction as described in Example 19.

[0180] The catalyst was tested for carbonylation of dimethyl ether as described in Example 19 with the difference being the amount of catalyst used. To keep the Al content in the reactor approximately constant, 0.468 g of hierarchical NH.sub.4-MOR was used which gave an inert-exclusive WHSV of 1.32 h.sup.1 (catalyst contained approximately 2.35 wt. % Al). The results for the reaction are shown in FIGS. 22 to 24. As compared to H-MORs with Si/Al ratios of 6.5 and 10.2, activity is decreased significantly and peak conversion is approximately 20%. Selectivity to MeOAc also is lower with selectivity to MeOH increased from what was seen at the ratios tested in Examples 19 and 20. MeOAc productivity is significantly less with peak productivity around 30 g.sub.MeoAc kg.sub.cat.sup.1 h.sup.1.

Example 22. Production and Testing of Hierarchical H/MOR with a Si/Al Ratio of 7.7

[0181] To produce Na-MOR with a Si/Al ratio of 7.7, 3 g of Na-MOR with a Si/Al ratio of 6.5 was mixed with 50 mL of 0.08.M HNO.sub.3 and heated subsequently to approximately 50 C. The mixture was stirred and left boiling for a period of one hour before it was cooled and filtered quickly to recover the solids. The recovered powder was washed excessively with deionized water. The recovered powder then was converted to NH.sub.4-MOR as described in Example 1.

[0182] The catalyst was calcined and prepared for reaction as described in Example 19.

[0183] The catalyst was tested for DME carbonylation as described in Example 19 with the only difference being the amount of catalyst used. To maintain approximately the same amount of Al in the reactor as in Example 19, the amount of catalyst used was increased to 0.232 g which gives an inert-exclusive WHSV of 2.66 H.sup.1. The H-MOR contains 4.4 wt % Al. The results for the reaction are shown in FIGS. 25 to 27 compared against the results of H/MOR with a Si/Al ratio of 6.5 as described in Example 19. As compared to H/MOR with a Si/Al ratio of 6.5, peak conversion is slightly less with a Si/Al ratio of 7.7, but the reaction time is double that of H/MOR with a Si/Al ratio of 6.5. This leads to a substantially higher amount of MeOAc produced per unit of Al at no loss in selectivity as shown in FIGS. 26 and 27.

Example 23. Production and Testing of Hierarchical H-MOR with a Si/Al Ratio of 8.6

[0184] To produce a Na-MOR with a Si/Al ratio of 8.6, 3 g of Na-MOR with a Si/Al ratio of 6.5 was mixed with 50 mL of 0.139 M HNO.sub.3 and heated subsequently to approximately 50 C. The mixture was stirred and left boiling for a period of one hour before it was cooled and filtered quickly to recover the solids. The recovered powder was washed excessively with deionized water. The recovered powder then was converted to NH.sub.4-MOR as described in Example 1.

[0185] The catalyst was calcined and prepared for reaction as described in Example 19.

[0186] The catalyst was tested for DME carbonylation as described in Example 19 with the only difference being the amount of catalyst used. To maintain approximately the same amount of Al in the reactor as in Example 19, the amount of catalyst used was increased to 0.254 g which gives an inert-exclusive WHSV of 2.43 H.sup.1. The H-MOR contains 4.0 wt. % Al. The results for the reaction are shown in FIGS. 25 to 27. As compared to H-MOR with a Si/Al ratio of 7.7, the results were similar.

Example 24. Production and Testing of 1Cu-4Zn/NH.SUB.4.-MOR Catalyst

[0187] The NH.sub.4-MOR material was produced as escribed in Example 1. It was ion-exchanged further using 0.021 M Cu(NO.sub.3).sub.2 and 0.179 M Zn(NO.sub.3).sub.2 aqueous solutions; the ion exchange was repeated 4 times to achieve an approximate molar ratio of 1:4 Cu:Zn and metal loading of 0.58 wt. % Cu and 2.50 wt. % Zn. In the time between the final ion exchange and being used in the carbonylation reaction, this catalyst was stored in a furnace maintained at 60 C.

[0188] The catalyst was calcined following the procedure as described in Example 2. The catalyst was reduced in situ at a temperature of 325 C. in 10% H.sub.2/Ar for a period of 2 hours. After this reduction the flow was switched to He and the catalyst was returned to ambient temperature, followed by the catalytic test.

[0189] The catalyst was tested for DME carbonylation as described in Example 16. The results for the reaction are shown in FIGS. 28 to 30. As compared to the 1Cu-3.5Zn/NH.sub.4-MOR catalyst described in Example 5, the stability is improved slightly showing increased conversion of DME. The MeOAc productivity is improved significantly both in terms of stability and peak productivity (240 g.sub.MeOAckg.sub.cat.sup.1 h.sup.1 vs. 200 g.sub.MeOAcokg.sub.cat.sup.1 h.sup.1). The selectivity towards MeOAc is nearly 100% for the majority of the reaction, decreasing slightly as the catalyst deactivates with the only other by-product detected being MeOH.

Example 25. Production and Testing of Zn/NH.SUB.4.-MOR Catalyst

[0190] The NH.sub.4-MOR material was produced as described in Example 1. It was ion-exchanged further using a 0.2 M Zn(NO.sub.3).sub.2 aqueous solution; the ion exchange was repeated 4 times to achieve an approximate metal loading 3.05 wt. % Zn.

[0191] The catalyst was calcined following the procedure as described in Example 2.

[0192] The catalyst was reduced in situ at a temperature of 325 C. in 10% H.sub.2/Ar for a period of 2 hours. After this reduction the flow was switched to He and the catalyst was returned to ambient temperature, followed by the catalytic test.

[0193] The catalyst was tested for DME carbonylation as described in Example 16. The results for the reaction are shown in FIGS. 28 to 30. As compared to the Cu/NH.sub.4-MOR catalyst described in Example 2, the stability is improved significantly but does not achieve the same peak DME conversion. A slightly higher peak MeOAc productivity is achieved as well and selectivity also is enhanced greatly with the only other by-product detected being MeOH. As compared to the 1Cu-4Zn/NH.sub.4-MOR, however, the overall conversion and MeOAc productivity is decreased substantially as shown in FIGS. 28 to 30. The benefit of the bimetallic catalyst is apparent.

Example 26. Production and Testing of Hierarchical 3Fe-1Zn/NH.SUB.4.-MOR with a Ratio Si/Al Ratio of 8.6

[0194] The hierarchical NH.sub.4-MOR material with a Si/Al ratio of 8.6 was produced as described in Example 23. The hierarchical NH.sub.4-MOR with a Si/Al ratio of 8.6 was mixed physically with hydrated FeCl.sub.2 and ZnCl.sub.2 so as to achieve a 100% loading of Fe and Zn relative to total Al content in the NH.sub.4-MOR and a molar ratio of Fe:Zn of 3.1. The solid state ion exchange was conducted as described in Example 16. The loading of Fe(II) and Zn achieved was 2.40 wt. % and 0.94 wt. %, respectively, which is an approximate 80% loading of Fe(II) and Zn relative to Al content on a molar basis.

[0195] The catalyst was calcined in situ prior to the catalytic reaction. The calcination was performed stepwise in a 10% O.sub.2/90% He gas mixture to avoid sieve damage by steaming at 110 C. for 3 hours, 350 C. for 1.5 hours, and 550 C. for 3 hours. After calcination the catalyst was reduced in a 10% H.sub.2/90% Ar gas mixture at 325 C. for two hours. After these treatments the catalyst was stored under He.

[0196] The catalyst then was tested in a reaction mixture of 93% CO/2% DME/5% He at 15 mL/min (STP), 0.15 g of a catalyst at 20 bar total pressure and starting at 210 C., and an inert-exclusive WHSV (STP) of 7.2 h.sup.1. The results for the reaction are shown in FIGS. 31-33. The initial temperature of 210 C. was not sufficient to facilitate the reaction and a final temperature of 260 C. was used as shown in FIGS. 31 and 33. Selectivity during the entirety of reaction was constant with selectivity towards MeOAc being approximately 96%. Conversion of DME decreased at a constant rate during the entirety of the reaction. A peak MeOAc productivity of approximately 340 g.sub.MeOAckg.sub.cat.sup.1 h.sup.1 was achieved which was substantially higher than any other catalyst tested.

[0197] The disclosure of all patents and publications (including published patent applications) are incorporated herein by reference to the same extent as if each patent and publication were incorporated individually by reference.

[0198] It is to be understood, however, that the scope of the present invention is not to be limited to the specific embodiments described above. The invention may be practiced other than as particularly described and still be within the scope of the accompanying claims.