Claims
- 1. A method of preparing a crystalline aluminosilicate composition 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 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. 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 temperature for about 0.75 to about 1.25 hours; and
- (e) cooling said crystalline aluminosilicate to ambient temperature in the presence of hydrogen.
- 2. A method as defined in claim 1, where in step (a) said platinum or palladium salt solution is ion-exchanged onto said crystalline aluminosilicate.
- 3. A method of claim 1, where in step (a) said platinum or palladium salt solution is impregnated onto said crystalline aluminosilicate.
- 4. A method as defined in claim 1, including the following additional steps:
- (f) mixing said aluminosilicate with a methanol synthesis catalyst in a weight ratio of methanol synthesis catalyst to crystalline aluminosilicate of about 0.3 to about 5.
- 5. A method as defined in claim 4, wherein said methanol synthesis catalyst comprises chromium oxide-zinc oxide or copper oxide-zinc oxide.
- 6. A crystalline aluminosilicate composition prepared in accordance with the method of claim 1.
- 7. A crystalline aluminosilicate composition prepared in accordance with the method of claim 2.
- 8. A crystalline aluminosilicate composition prepared in accordance with the method of claim 3.
- 9. A crystalline aluminosilicate composition prepared in accordance with the method of claim 4.
- 10. A crystalline aluminosilicate composition prepared in accordance with the method of claim 5.
CROSS-REFERENCE TO RELATED APPLICATIONS
This is a continuation-in-part of application Ser. No. 117,453, filed Oct. 26, 1987 which is a continuation of application Ser. No. 750,119, filed Jul. 1, 1985,both now abandoned.
US Referenced Citations (16)
Foreign Referenced Citations (2)
Number |
Date |
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2746790 |
Apr 1978 |
DEX |
2848849 |
May 1980 |
DEX |
Continuations (1)
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Number |
Date |
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Parent |
750119 |
Jul 1985 |
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Continuation in Parts (1)
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Number |
Date |
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117453 |
Oct 1987 |
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