Ethylene oxide catalyst and process

Details Ethylene oxide catalyst and process Ethylene oxide catalyst and process

1994-12-29

1997-01-28

Pal, Asok

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

Catalyst or precursor therefor

Metal, metal oxide or metal hydroxide

502308, 502319, 502321, 502344, 502347, 502350, B01J 2106, B01J 2304, B01J 2350

Patent

active

055977731

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: 5081096 (1992-01-01), Monnier et al.
patent: 5187140 (1993-02-01), Thorsteinson et al.
patent: 5418202 (1995-05-01), Evans et al.

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