Method for improving the selectivity of a catalyst and a...

Details Method for improving the selectivity of a catalyst and a... Method for improving the selectivity of a catalyst and a...

2003-06-26

2009-02-03

Hailey, Patricia L (Department: 1793)

Catalyst, solid sorbent, or support therefor: product or process

Catalyst or precursor therefor

Sulfur or compound containing same

C502S202000, C502S208000, C502S209000, C502S210000, C502S211000, C502S212000, C502S213000, C502S214000, C502S215000, C502S219000, C502S305000, C502S306000, C502S307000, C502S308000, C502S309000, C502S310000, C502S311000, C502S312000, C502S313000, C502S314000, C502S315000, C502S316000, C502S317000, C502S318000, C502S319000, C502S320000, C502S321000, C502S322000, C502S323000, C502S324000, C502S344000, C502S347000, C502S348000

Reexamination Certificate

active

07485597

ABSTRACT:
A method for improving the selectivity of a supported highly selective epoxidation catalyst comprising silver in a quantity of at most 0.17 g per m2surface area of the support, which method comprisescontacting the catalyst, or a precursor of the catalyst comprising the silver in cationic form, with a feed comprising oxygen at a catalyst temperature above 250° C. for a duration of up to 150 hours, andsubsequently decreasing the catalyst temperature to a value of at most 250° C.; anda process for the epoxidation of an olefin, which process comprisescontacting a supported highly selective epoxidation catalyst comprising silver in a quantity of at most 0.17 g per m2surface area of the support, or a precursor of the catalyst comprising the silver in cationic form, with a feed comprising oxygen at a catalyst temperature above 250° C. for a duration of up to 150 hours, andsubsequently decreasing the catalyst temperature to a value of at most 250° C. and contacting the catalyst with the feed comprising the olefin and oxygen.

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