Mobil Oil Corporation

Charles J Plank

Edward J Rosinski

Mae K Rubin

Edwin N Givens

George T Kerr

Albert B Schwartz

Harry G Doherty

A method of producing zeolites particularly ZSM-5 and ZSM-11 by strictly controlling the composition of the forming bath such that no organic is required. In a preferred embodiment the forming bath can contain seeds, lower aliphatic alcohols and/or ammonium hydroxide. The as-crystallized product has no organic in its pore structures and has a relatively low silica to alumina ratio.

Method for producing zeolites

As synthesized by previous methods, ZSM-5 or ZSM-11 zeolites are crystallized in the presence of substantial amounts of a nitrogen-containing compound. When synthesized in this way, they contain an organic ammonium cation as well as a metal cation such as sodium. To obtain a more active form, the sodium ion must be exchanged out. Such exchange, especially with ZSM-5 and ZSM-11, is difficult unless there is calcination of the zeolite to remove the obstructing organo compounds. By making these zeolites in the presence of (1) seeds of the desired zeolite, (2) mixtures of them with ammonium hydroxide and/or alcohol, (3) the alcohol per se or (4) mixtures of the alcohol with ammonium hydroxide, a product substantially deficient in organic ammonium cation is obtained. These products can be exchanged directly without any calcination.

Conversion, e.g. dehydration of aliphatic organic oxygenates having up to about 6 carbon atoms by contact with a crystalline aluminosilicate zeolite, preferably ZSM-5, having a silica to alumina ratio substantially greater than 10, at a temperature of about 70.degree. to 1400.degree. F., depending upon the exact nature of the reactant and product.

Conversion of ethers using a zeolite catalyst

Conversion of polar compounds using a ZSM-5 zeolite catalyst

ZSM-5 type zeolites as more specifically defined hereinabove, are added to reforming catalysts in order to produce a new catalyst composition with high catalytic activity and excellent selectivity. These new catalysts when utilized in reforming naphtha, reduce the C.sub.1 plus C.sub.2 concentrations in reformer gas product, while increasing the C.sub.3 plus C.sub.4 concentrations.

Novel reforming catalysts

A new crystalline zeolite, designated 'ZSM-25', a method of making the zeolite and using the zeolite in catalytic conversion of hydrocarbons, is the subject of this application. The new zeolite has a composition in the anhydrous state expressed in terms of mole ratios of oxides as follows:

Crystalline zeolite ZSM-25

A new crystalline zeolite, designated ZSM-43, a method of making same and the use thereof in catalytic conversion of organic compounds is the subject of this application. The new zeolite has a composition, in the anhydrous state, expressed in terms of mole ratios of oxides, as follows:

Crystalline zeolite, synthesis and use thereof

Alkylation of aromatics using a high silica zeolite

Crystalline zeolite ZSM-43 synthesis thereof

Crystalline aluminosilicate zeolites are mixed with conventional reforming catalysts to produce new catalytic compositions with high catalytic activity and selectivity and excellent aging characteristics. These new catalytic compositions may be utilized alone or in conjunction with conventional reforming catalysts. The acidic activity of the total catalyst system is controlled within defined limits. When so controlled the utility of these catalyst systems in reforming hydrocarbon mixtures is to reduce the C.sub.1 and C.sub.2 concentrations in reformer gas product, while increasing the C.sub.3 and C.sub.4 concentrations and maintaining high liquid yield at high octane numbers.

Reforming catalysts

A process for converting hydrocarbons with stabilized crystalline aluminosilicate catalysts. The catalysts contain zinc, and are stabilized by adding thereto another metal of Group IB or Group VIII (e.g. copper or nickel). Germanium, rhenium and the rare earth metals may also be added.

Aromatization of C.sub.2 -C.sub.10 hydrocarbons over stabilized

A method is disclosed for synthesizing a crystalline aluminosilicate zeolite containing an organic nitrogen cation in the presence of a primary monoalkylamine having 2 to 9 carbon atoms in the alkyl portion. The method produces a zeolite having a very low percentage, i.e. less than about 0.14 weight percent, generally less than about 0.1 weight percent of alkali metal, e.g. sodium, in the as-synthesized form. The product can be used directly as a catalyst without intermediate precalcination and cation exchange. This is not possible with zeolites such as those of the ZSM-5 type synthesized by the methods of the art.

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Woodbury, NJ, United States of America

Charles J Plank