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US 5,703,253 AGranted
Ethylene oxide catalyst and process
AssigneeShell Oil Company
InventorsWayne E. Evans, Carolus Matthias Anna Maria Mesters
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AssigneeShell Oil Company
InventorsWayne E. Evans, Carolus Matthias Anna Maria Mesters
Estimating the term…
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.
A process for the production of ethylene oxide comprising the steps of contacting ethylene in the vapor phase with an oxygen-containing gas at ethylene oxide forming conditions at a temperature ranging between about 180.degree. C. and 330.degree. C. in the presence of a catalyst comprising a porous refractory support having deposited thereon a catalytically effective amount of silver, a promoting amount of alkali metal, a promoting amount of rhenium, and a promoting amount of Group IVB metal applied to the support in the form of oxycation-containing compound(s), wherein said Group IVB metal is selected from the group consisting of titanium, zirconium, and hafnium.
A process for the epoxidation of olefins having no allylic hydrogen comprising the steps of contacting the olefins in the vapor phase with an oxygen-containing gas maintain at a ratio of olefin to oxygen in the range of 0.01 up to 20, at epoxide forming conditions at a temperature in the range of from about 75.degree. C. to about 325.degree. C. in the presence of an organic halide, inorganic halides, acid halides, or elemental halogens, and a catalyst comprising a porous refractory support having deposited by impregnation thereon a catalytically effective amount of silver, a promoting amount of alkali metal, a promoting amount of rhenium, and a promoting amount of Group IVB metal applied to the support in the form of oxycation-containing compound(s);
A process for the production of ethylene oxide comprising the steps of contacting ethylene in the vapor phase with an oxygen-containing gas at ethylene oxide forming conditions at a temperature ranging between about 180.degree. C. and 330.degree. C. in the presence of a catalyst prepared by a process which comprises the steps of:
Dependencies are inferred from the claim text.