EP0024930A1
Expired / Lapsed
EP
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A method of preparing active ion-exchanged zeolite catalysts
Assignee: BP PLC
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Filing: 1980-08-29
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Granted: —
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Expires: 2000-08-29
Abstract
Abstract This invention relates to an improved method of preparing a zeolite composition in which some or all of the cations have been exchanged for gallium ions. The zeolite has a high silica to alumina ratio and is prepared by crystallisation from an aqueous solution containing a mixture of a source of silica, a source of alumina, and at least two other components selected from the group of alkali metal ions, ammonia and an organic nitrogen containing base. The improvement lies in washing the crystallized zeolite with acidified and / or deionised water, calcining the washed product at an elevated temperature, contacting the calcined product with an acid, refluxing the acid treated zeolite with a solution of a gallium compound to produce a gallium exchange zeolite and washing the gallium exchanged zeolite with waterto render it substantially free from any impregnated gallium or gallium compound. The zeolite composition is useful as a catalyst for hydrocarbon conversion reactions.
Inventors
- 👤 Clive David Telford
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-05 18:42
CPC Classifications
C; C07; C07C; C07C2/00; C07C2/76; B; B01; B01J; B01J29/00; B01J29/04; B01J29/06; B01J29/70; B01J29/7049; B01J2229/00; B01J2229/10; B01J2229/26; B01J2229/30; B01J2229/42; C07C2529/00; C07C2529/87
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
140 words
An improved method of preparing a catalyst composition comprising a zeolite in which some or all of the cations have been exchanged for gallium ions, said zeolite having a high silica to alumina ratio and being prepared by crystallisation from an aqueous solution comprising a mixture of a source of silica, a source of alumina, and at least two other components selected from the group of alkali metal ions, ammonia and an organic nitrogen containing base, said improvement comprising washing the crystallised zeolite with acidified and/or deionised water, calcining the washed product at an elevated temperature, contacting the calcined product with an acid, contacting the acid-treated product with a solution of a gallium compound to produce a gallium exchanged zeolite and washing the gallium exchanged zeolite with water to render it substantially free from any impregnated gallium or gallium compound.
Claim 2
Dependent Claim
140 words
An improved method of preparing a catalyst composition comprising a zeolite in which some or all of the cations have been exchanged for gallium ions, said zeolite having a high silica to alumina ratio and being prepared by crystallisation from an aqueous solution comprising a mixture of a source of silica, a source of alumina, and at least two other components selected from the group of alkali metal ions, ammonia and an organic nitrogen containing base, said improvement comprising washing the crystallised zeolite with acidified and/or deionised water, calcining the washed product at an elevated temperature, contacting the calcined product with an acid, contacting the acid-treated product with a solution of a gallium compound to produce a gallium exchanged zeolite and washing the gallium exchanged zeolite with water to render it substantially free from any impregnated gallium or gallium compound.
Claim 3
Dependent Claim
32 words
A method according to claim 1 wherein the organic nitrogen-containing base is selected from a quaternary ammonium base, a pyrrolidine, an alkyldiamine containing from 2 to 20 carbon atoms and an alkanolamine.
Claim 4
Dependent Claim
18 words
A method according to claim 2 wherein the alkanolamine is selected from mono-ethanolamine, di-ethanolamine, mono-propanolamine and di- propanolamine.
Claim 5
Independent Claim
43 words
A method according to any one of the preceding claims wherein the ratio of the silica source to the alumina source is in the range from . 10:1 to 500:1 based on the equivalent moles of silica and alumina in the respective sources.
Claim 6
Independent Claim
43 words
A method according to any one of the preceding claims wherein the alkali metal ion or ammonia source is present in an amount from 0.01 to 50 moles of alkali metal per mole equivalent of total silica and alumina in the respective sources.
Claim 7
Independent Claim
37 words
A method according to any one of the preceding claims wherein the organic nitrogen-containing base is present in an amount from 0.02 to 50 moles per mole equivalent of total silica and alumina in their respective sources.
Claim 8
Independent Claim
25 words
A method according to any one of the preceding claims wherein the acid used is a mineral acid selected from nitric,sulphuric, hydrochloric and hydrofluoric acid.
Claim 9
Dependent Claim
30 words
A process according to any one of the preceding claims wherein the crystallised zeolite is subjected to one or more treatments with ammonia before or after contact with the acid.
Claim 10
Dependent Claim
102 words
An improved method of preparing a catalyst composition according to claim 1 said improvement comprising washing the crystallised zeolite with acidified and/or deionised water, calcining the water washed product at a temperature between 300 and 800°C, contacting the calcined product with an acid, contacting the acid treated zeolite with ammonia or ammonium ions, recalcining the ammonia treated product at a temperature between 350° and 700°C, refluxing the recalcined product with a solution of a gallium compound to produce a gallium exchanged zeolite and washing the gallium exchanged zeolite with water to render it substantially free from any impregnated gallium or gallium compound.
Claim 11
Independent Claim
52 words
A method according to any one of the preceding claims wherein the recalcined product is subjected to a gallium exchange by refluxing the (re-) calcined zeolite with a solution of gallium nitrate and washed with deionised water so that gallium exchanged zeolite is substantially free from any impregnated gallium or gallium compound.
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