A bifunctional catalyst for example for conversion of oxygenates, the bifunctional catalyst comprising zeolite, alumina binder, Zn and P, wherein Zn is present at least partly as ZnAl.sub.2O.sub.4.

Catalysts for the production of an alcohol and/or an ether from synthesis gas, methods of making the catalysts, and uses thereof are described. The catalyst can include catalytic Cu metal particles or oxides thereof and/or Ni metal particles or oxides thereof on an alkali metal or alkaline earth metal silicate support.

Catalysts for the production of an alcohol and/or an ether from synthesis gas, methods of making the catalysts, and uses thereof are described. The catalyst can include catalytic Cu metal particles or oxides thereof and/or Ni metal particles or oxides thereof on an alkali metal or alkaline earth metal silicate support.

The present invention relates to the preparation of various types of natural zeolite catalysts from natural zeolites such as clinoptilolite and the method of producing dimethyl ether from methyl alcohol using these natural zeolite catalysts.

The present invention relates to the preparation of various types of natural zeolite catalysts from natural zeolites such as clinoptilolite and the method of producing dimethyl ether from methyl alcohol using these natural zeolite catalysts.

A bifunctional catalyst for example for conversion of oxygenates, said bifunctional catalyst comprising zeolite, alumina binder, Zn and P, wherein Zn is present at least partly as ZnAl.sub.2O.sub.4.

Provided is a method for directly preparing dimethyl ether by synthesis gas, the method comprises: the synthesis gas is passed through a reaction zone carrying a catalyst, and reacted under the reaction conditions sufficient to convert at least a portion of the raw materials to obtain the reaction effluent comprising dimethyl ether; and the dimethyl ether is separated from the reaction effluent, wherein the catalyst is zinc aluminum spinel oxide. In the present invention, only one zinc aluminum spinel oxide catalyst is used, which can make the synthesis gas to highly selectively form dimethyl ether, the catalyst has good stability and can be regenerated. The method of the present invention realizes the production of dimethyl ether in one step by the synthesis gas, and reduces the large energy consumption problem caused by step-by-step production.

Provided is a method for directly preparing dimethyl ether by synthesis gas, the method comprises: the synthesis gas is passed through a reaction zone carrying a catalyst, and reacted under the reaction conditions sufficient to convert at least a portion of the raw materials to obtain the reaction effluent comprising dimethyl ether; and the dimethyl ether is separated from the reaction effluent, wherein the catalyst is zinc aluminum spinel oxide. In the present invention, only one zinc aluminum spinel oxide catalyst is used, which can make the synthesis gas to highly selectively form dimethyl ether, the catalyst has good stability and can be regenerated. The method of the present invention realizes the production of dimethyl ether in one step by the synthesis gas, and reduces the large energy consumption problem caused by step-by-step production.

A process for dehydrating methanol to dimethyl ether product in the presence of an aluminosilicate zeolite catalyst and a promoter selected from (i) aldehyde of formula R.sup.1CHO (Formula I) in which R.sup.1 is hydrogen, a C.sub.1-C.sub.11 alkyl group or a C.sub.3-C.sub.11 alkyl group in which 3 or more carbon atoms are joined to form a ring; or (ii) acetal derivative of an aldehyde of Formula I; and the molar ratio of promoter to methanol is maintained at 0.1 or less.

A process for dehydrating methanol to dimethyl ether product in the presence of an aluminosilicate zeolite catalyst and a promoter selected from (i) aldehyde of formula R.sup.1CHO (Formula I) in which R.sup.1 is hydrogen, a C.sub.1-C.sub.11 alkyl group or a C.sub.3-C.sub.11 alkyl group in which 3 or more carbon atoms are joined to form a ring; or (ii) acetal derivative of an aldehyde of Formula I; and the molar ratio of promoter to methanol is maintained at 0.1 or less.