Claims
- 1. A method for the conversion of synthesis gas comprising:
- contacting synthesis gas which comprises hydrogen and carbon monoxide with a catalytically effective amount of a crystalline aluminosilicate composition, under conversion conditions effective to provide C.sub.2+3 hydrocarbons at a carbon yield of at least about 20% and a carbon selectivity of at least about 80%, said conversion conditions comprising a temperature of 325.degree.-500.degree. C. and a pressure of 50-1000 psig and said aluminosilicate composition being prepared by a method which comprises:
- (a) contacting a crystalline aluminosilicate with a platinum or palladium salt solution to provide a platinum or palladium crystalline aluminosilicate containing about 0.2 to about 5.0% by weight of platinum or palladium, said crystalline aluminosilicate being ZSM-5 or chabazite;
- (b) calcining the platinum or palladium crystalline aluminosilicate in air at a temperature of about 300.degree. C. to about 600.degree. C. for at least 4 hours;
- (c) heating the calcined palladium or platinum crystalline aluminosilicate in the presence of hydrogen from ambient temperature to an elevated temperature of about 300.degree. C. to about 400.degree. C. at a rate of temperature increase of about 0.5 to about 2.0.degree. C. per minute;
- (d) maintaining said crystalline aluminosilicate at said elevated temperature for about 0.75 to about 1.25 hours;
- (e) cooling said crystalline aluminosilicate to ambient temperature in the presence of hydrogen; and
- (f) mixing said crystalline aluminosilicate with a methanol synthesis catalyst in a weight ratio of methanol synthesis catalyst to crystalline aluminosilicate of about 0.3 to about 5, said methanol synthesis catalyst comprising chromium oxide-zinc oxide or copper oxide-zinc oxide.
- 2. A method according to claim 1, where in step (a) said platinum or palladium salt solution is ion-exchanged onto said crystalline aluminosilicate.
- 3. A method according to claim 1, where in step (a) said platinum or palladium salt solution is impregnated onto said crystalline aluminosilicate.
CROSS-REFERENCE TO RELATED APPLICATIONS
This is a divisional of copending application Ser. No. 201,663, filed on June 2, 1988, now U.S. Pat. No. 4,980,326, which is a continuation-in-part of application Ser. No. 117,453, filed Oct. 26, 1987, now abandoned, which is a continuation of application Ser. No. 750,119, filed July 1, 1985, now abandoned.
US Referenced Citations (14)
Divisions (1)
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201663 |
Jun 1988 |
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Continuations (1)
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750119 |
Jul 1985 |
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