Ethylene oxide catalyst and process

Details Ethylene oxide catalyst and process Ethylene oxide catalyst and process

1996-09-26

1997-12-30

Ivy, C. Warren

Organic compounds -- part of the class 532-570 series

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

502308, 502319, 502321, 502344, 502348, 502349, C07D30110

Patent

active

057032530

ABSTRACT:
This invention relates to ethylene oxide catalyst for the vapor phase production of ethylene oxide from ethylene and oxygen prepared by impregnating a porous, refractory support having a surface area ranging from about 0.05 to about 10 m.sup.2 /g with a solubilized catalytically effective amount of silver, a solubilized promoting amount of alkali metal, a solubilized promoting amount of rhenium, and a solubilized promoting amount of hafnium metal, wherein the Group IVB metal is provided in the form of Group IVB oxycation-containing salts. The catalyst provide substantial initial activity improvement as well as long term selectivity and activity stability improvement over prior art rhenium promoted catalyst, without any loss of initial selectivity advantage.

REFERENCES:
patent: 4459372 (1984-07-01), Arena
patent: 4908343 (1990-03-01), Bhasin
patent: 5057481 (1991-10-01), Bhasin
patent: 5418202 (1995-05-01), Evans et al.

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