Uop Lcc

Union Carbide Corporation

Gary W Skeels

Edith M Flanigen

Richard Ramos

Diane M Chapman

Donald W Breck, Deceased

Donald F Best

James G Vassilakis

By Harold Blass, Executor

Marilyn R Sears

Diane M Chapman-Snyder

The present invention relates to a zeolite beta catalyst characterized by critical limits of weak and strong acid species and exceptionally high catalytic activity. The catalyst is activated at a temperature effective to substantially reduce the concentration of strong acid species, i.e., hydronium cations, without substantially reducing the concentration of weak acid species, i.e., hydroxoaluminum cations, preferably following a calcining step wherein a synthesized zeolite beta catalyst containing a templating agent is calcined at a temperature in the range of from about 200.degree. to 1000.degree. C. in order to remove a substantial portion of the catalyst templating agent and an ion-exchanging step wherein the calcined catalyst is ion-exchanged with a salt solution containing at least one hydrogen forming cation selected from NH.sub.4.sup.+ and quaternary ammonium. Conversion processes utilizing the catalyst of the invention, including isomerization of paraffins and alkylaromatics and disproportionation of aromatics, also are disclosed.

Activated zeolite beta and its use for hydrocarbon conversion

Molecular sieve compositions are prepared by extracting aluminum and substituting chromium and/or tin for extracted aluminum to give molecular sieve products containing framework chromium and/or tin atoms. The process of preparing the chromium and/or tin-containing molecular sieves involves contacting a starting molecular sieve with a solution or slurry of at least one of a fluoro salt of chromium or a fluoro salt of tin under effective process conditions to provide for aluminum extraction and substitution of chromium and/or tin.

Substitution of Sn in place of Al in the framework of molecular sieve

The present invention relates to a zeolite beta catalyst characterized by critical limits of weak and strong acid species and exceptionally high catalytic activity. The catalyst is activated at a temperature effective to substantially reduce the concentration of strong acid species, i.e., hydronium cations, without substantially reducing the concentration of weak acid species, i.e., hydroxoaluminum cations, preferably following a calcining step wherein a synthesized zeolite beta catalyst containing a templating agent is calcined at a temperature in the range of from about 200.degree. to 1000.degree. C. in order to remove a substantial portion of the catalyst templating agent and an ion-exchanging step wherein the calcined catalyst is ion-exchanged with a salt solution containing at least one hydrogen forming cation selected from NH.sub.4.sup.+ and quaternary ammonium. Conversion processes utilizing the catalyst of the invention also are disclosed.

This invention relates to hydrocarbon conversion processes using novel molecular sieve compositions as the catalyst. These molecular sieves contain chromium in the framework structure along with aluminum and silicon. The process of preparing the chromium-containing molecular sieves involves contacting a starting molecular sieve with a solution or slurry of a fluoro salt of chromium under effective process conditions to provide for aluminum extraction and substitution of chromium.

Hydrocarbon conversion process using a chromium substituted molecular

This invention relates to molecular sieve compositions and processes for using the molecular sieves. The molecular sieves have a three-dimensional microporous crystalline framework structure of tetrahedral oxide units of AlO.sub.2, SiO.sub.2, TiO.sub.2 and/or FeO.sub.2. These molecular sieves can be prepared by contacting a starting zeolite with a solution or slurry of a fluoro salt of titanium and/or iron under effective process conditions to extract aluminum from the zeolite framework and substitute titanium and/or iron. The molecular sieves can be used as catalysts in hydrocarbon conversion processes and other processes.

Substituted aluminosilicate compositions and process for preparing

Silicon is inserted into the crystal lattice of zeolites containing defect sites by reaction with SiCl.sub.4 in the presence of oxygen. It has been found that by initially dehydrating the starting zeolite and removing the hydroxyl groups existing in the crystal defect sites, the generation of HCl from the SiCl.sub.4 reagent is avoided along with the undesirable aluminum hydrolysis reactions between the HCl thus-generated and the zeolite framework. The prior dehydration and dehydroxylation makes the presence of oxygen essential to the silicon insertion.

Insertion of silicon into the crystal framework of a zeolite

A novel aluminosilicate zeolite molecular sieve, denominated LZ-276, having effective pore diameters in the small to medium size range and possibly being topologically related to zeolite Phi, is synthesized hydrothermally in the TEAOH-Na.sub.2 O--SiO.sub.2 --Al.sub.2 O.sub.3 --H.sub.2 O system at a temperature of from 100.degree. C. to 150.degree. C.

Zeolite LZ-276 and process for preparing same

The combination of a steam-stabilized form of zeolite Y, known in the art as Y-85, and a form of zeolite beta which has been modified to maximize the weak acid sites and minimize the strong acid sites, is found to be a uniquely effective acidic component of a hydrocracking catalyst for the production of gasoline. Both the catalyst composition and the hydrocracking process utilizing the catalyst are disclosed.

Octane gasoline catalyst

A novel aluminosilicate zeolite, denominated LZ-277 is synthesized hydrothermally from aqueous gels in the Na.sub.2 O--Al.sub.2 O.sub.3 --SiO.sub.2 system and in the absence of an organic templating agent. The as-synthesized LZ-277 has a chemical composition on an anhydrous basis expressed in terms of molar oxide ratios of:

Zeolite LZ-277 and process for preparing same

Molecular sieve compositions are prepared by extracting aluminum and substituting chromium and/or tin for extracted aluminum to give molecular sieve products containing framework chromium and/or tin atoms. The process of preparing the chromium and/or tin-containing molecular sieves invovles contacting a starting molecular sieve with a solution or slurry of at least one of a fluoro salt of chromium or a fluoro salt of tin under effective process conditions to provide for aluminum extraction and substitution of chromium and/or tin. These compositions are effective as hydrocarbon conversion catalysts and for separating mixtures of molecular species.

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Brewster, NY, United States of America

Gary W Skeels