Claims
- 1. A method for producing an activated catalyst said method comprising:
- (1) contacting a catalyst comprising chromium on a silica-containing support with a gaseous environment consisting essentially of sulfur dioxide and oxygen at a temperature within a temperature range and for a time sufficient to activate the catalyst and subsequently
- (2) maintaining a temperature within the contact temperature range of step (1) while contacting said catalyst with a gaseous environment consisting essentially of oxygen and gases inert to reaction with the catalyst.
- 2. A method of claim 1 wherein the catalyst is contacted with a gaseous environment consisting essentially of oxygen and gases inert to reaction with the catalyst while the temperature is being increased prior to contact with sulfur dioxide.
- 3. A method of claim 1 wherein the catalyst is contacted with a gaseous environment consisting essentially of sulfur dioxide and oxygen while the temperature is being increased to the activation range.
- 4. A method of claim 1, 2 or 3 wherein the temperature for step (b) is not raised above that attained in step (a).
- 5. A method of claim 1, 2 or 3 wherein the mole ratio of sulfur dioxide:oxygen is in the range of about 1:0.55 to about 1:10.
- 6. A method of claim 1, 2 or 3 wherein said gaseous environment consisting essentially of sulfur dioxide and oxygen is within a temperature range of about 450.degree. to about 1100.degree. C. (840.degree. to 2000.degree. F.), the contact time between the gaseous environment of sulfur dioxide and oxygen is in the range of about 1 to about 5 hours, and the total contact time between catalyst and gaseous environment is in the range of about 2 to about 20 hours.
- 7. A method of claim 6 wherein the contact between the catalyst and the gaseous environment of sulfur dioxide and oxygen is within a temperature range of about 540.degree. to about 900.degree. C. (1000.degree.-1650.degree. F.).
- 8. An activated catalyst produced by the method of claims 1, 2, 3 or 6.
BACKGROUND OF THE INVENTION
This is a continuation-in-part application of copending application Ser. No. 002,633, filed Jan. 11, 1979 now abandoned.
US Referenced Citations (5)
Continuation in Parts (1)
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Number |
Date |
Country |
Parent |
2633 |
Jan 1979 |
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