The present invention relates to a process for the preparation of a zeolitic material having a structure comprising YO.sub.2 and optionally comprising X.sub.2O.sub.3, preferably comprising YO.sub.2 and X.sub.2O.sub.3, wherein said process comprises the steps of (1) providing a mixture comprising one or more ammonium compounds of which the ammonium cation has the formula (I):
[R.sup.1R.sup.2NR.sup.3R.sup.4].sup.+(I) and further comprising one or more sources for YO.sub.2 and one or more sources for X.sub.2O.sub.3; (2) crystallizing the mixture provided in (1);
wherein Y is a tetravalent element, and X is a trivalent element, and
wherein in formula (I)
R.sup.1 and R.sup.2 are independently from one another derivatized or underivatized methyl, and
R.sup.3 and R.sup.4 are independently from one another derivatized or underivatized (C.sub.3-C.sub.5)alkyl, and
wherein the molar ratio of ammonium cation having the formula (I) to Y in the mixture provided in step (1) and crystallized in step (2) is equal to or greater than 0.25.

The present invention relates to a process for the preparation of a zeolitic material having a structure comprising YO.sub.2 and optionally comprising X.sub.2O.sub.3, preferably comprising YO.sub.2 and X.sub.2O.sub.3, wherein said process comprises the steps of (1) providing a mixture comprising one or more ammonium compounds of which the ammonium cation has the formula (I):
[R.sup.1R.sup.2NR.sup.3R.sup.4].sup.+(I) and further comprising one or more sources for YO.sub.2 and one or more sources for X.sub.2O.sub.3; (2) crystallizing the mixture provided in (1);
wherein Y is a tetravalent element, and X is a trivalent element, and
wherein in formula (I)
R.sup.1 and R.sup.2 are independently from one another derivatized or underivatized methyl, and
R.sup.3 and R.sup.4 are independently from one another derivatized or underivatized (C.sub.3-C.sub.5)alkyl, and
wherein the molar ratio of ammonium cation having the formula (I) to Y in the mixture provided in step (1) and crystallized in step (2) is equal to or greater than 0.25.

The invention relates to the production of aromatic hydrocarbon by the conversion of a feed comprising saturated hydrocarbon. At least a portion of the saturated hydrocarbon is converted to olefinic hydrocarbon. Aromatic hydrocarbon is produced from at least a portion of the olefinic hydrocarbon using at least one dehydrocyclization catalyst comprising dehydrogenation and molecular sieve components.

The present invention relates to an SCM-10 molecular sieve, a process for producing same and use thereof. The molecular sieve has an empirical chemical composition as illustrated by the formula the first oxide.Math.the second oxide, wherein the ratio by molar of the first oxide to the second oxide is less than 40, the first oxide is at least one selected from the group consisting of silica and germanium dioxide, the second oxide is at least one selected from the group consisting of alumina, boron oxide, iron oxide, gallium oxide, titanium oxide, rare earth oxides, indium oxide and vanadium oxide. The molecular sieve has specific XRD pattern and can be used as an adsorbent or a catalyst for converting an organic compound.

Accordingly, the present invention provides a catalyst composition suitable for converting light naphtha comprising one or more of C5 to C8 carbon atoms to aromatic compounds ranging from C6 to C10 carbon atoms, said catalyst composition comprising: (a) a medium pore size zeolite; (b) 0.1 to 5.0 wt % of zinc; and (c) 0.1 to 5 wt % of gallium. Also, the present invention provides a process for converting light naphtha comprising one or more of C5 to C8 carbon atoms to aromatic compounds ranging from C6 to C10 carbon atoms, said process comprising the step of contacting a feedstock comprising the light naphtha with a catalyst composition comprising (a) a medium pore size zeolite; (b) 0.1 to 5.0 wt % of zinc; and (c) 0.1 to 5 wt % of gallium in presence of carrier gas at temperatures ranging from 400 to 600 C.

The invention relates to the production of aromatic hydrocarbon by the conversion of a feed comprising C.sub.2+ non-aromatic hydrocarbon, e.g., natural gas. The invention is particularly useful in converting natural gas to liquid-phase aromatic hydrocarbon, which can be more easily transported away from remote natural gas production facilities. The conversion is carried out in the presence of a dehydrocyclization catalyst comprising dehydrogenation and molecular sieve components. The dehydrocyclization catalyst has an average residence time of 90 seconds or less.

Process for the carbonylation of dimethyl ether with carbon monoxide in the presence of a catalyst to produce methyl acetate reaction product. The carbonylation process is conducted in the presence of hydrogen at a molar ratio of hydrogen to carbon monoxide of greater than 1 and the catalyst is a mordenite zeolite prepared from a synthesis mixture comprising at least one organic structure directing agent.

Process for the carbonylation of dimethyl ether with carbon monoxide in the presence of a catalyst to produce methyl acetate reaction product. The carbonylation process is conducted in the presence of hydrogen at a molar ratio of hydrogen to carbon monoxide of greater than 1 and the catalyst is a mordenite zeolite prepared from a synthesis mixture comprising at least one organic structure directing agent.

A passive NO.sub.x adsorber is disclosed. The passive NO.sub.x adsorber is effective to adsorb NO.sub.x at or below a low temperature and release the adsorbed NO.sub.x at temperatures above the low temperature. The passive NO.sub.x adsorber comprises a noble metal and a molecular sieve having an LTL Framework Type. The invention also includes an exhaust system comprising the passive NO.sub.x adsorber, and a method for treating exhaust gas from an internal combustion engine utilizing the passive NO.sub.x adsorber.