SC.sub.2 activation of supported chromium oxide catalysts

Details SC.sub.2 activation of supported chromium oxide catalysts SC.sub.2 activation of supported chromium oxide catalysts

1980-09-03

1981-12-22

Levin, Stanford M.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Polymers from only ethylenic monomers or processes of...

252458, 526100, 526352, C08F 424

Patent

active

043072143

ABSTRACT:
A method for producing activated catalysts in which a catalyst containing chromium on a silica-containing support is (1) contacted with a gaseous environment consisting essentially of sulfur dioxide and oxygen at a temperature in a range of about 450.degree. C. to about 1100.degree. C. for a time ranging from about one to about five hours and (2) subsequently maintaining a temperature within the contact temperature range while contacting the catalyst with a gaseous environment consisting essentially of oxygen and gases inert to reaction with the catalyst. In another embodiment of the invention the temperature for a succeeding step is not raised above that attained in the previous step. In an embodiment of the invention 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.

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