This invention relates to an ethylene oxide catalyst which contains silver and one or more alkali metal promoters supported on a carrier prepared by a process comprising the use of ceramic particle components with particle sizes chosen to ensure that a desired degree of porosity is obtained without the use of organic burnout materials.

Ethylene oxide catalyst and process

A silver catalyst for ethylene oxidation to ethylene oxide is provided containing a promoter combination consisting of an alkali metal component, a sulfur component, and a fluorine component, the catalyst being essentially free of rhenium and transition metal components.

Ethylene oxide catalyst

A method for improving the selectivity of a supported highly selective epoxidation catalyst comprising silver in a quantity of at most 0.19 g per m2 surface area of the support, which method comprises - contacting 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, and - subsequently decreasing the catalyst temperature to a value of at most 250 °C; and a process for the epoxidation of an olefin, which process comprises - contacting a supported highly selective epoxidation catalyst comprising silver in a quantity of at most 0.19 g per m2 surface 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, and - subsequently decreasing the catalyst temperature to a value of at most 250 °C and contacting the catalyst with the feed comprising the olefin and oxygen.

A method for improving the selectivity of a catalyst and a process for the epoxidation of an olefin

Towards highly selective ethylene epoxidation catalysts using hydrogen peroxide and tungsten- or niobium-incorporated mesoporous silicate (KIT-6)

A catalyst for oxidizing ethylene and producing ethylene oxide, said catalyst being prepared by pretreating a porous carrier with a solution containing a lithium compound and a cesium compound, thereafter, impregnating a solution containing a silver compound and a cesium compound in the pretreated porous carrier and then heat-treating the impregnated porous carrier. The use of the catalyst of this invention provides high selectivity in the production of ethylene oxide by the vapor contact oxidation of ethylene.

Catalyst for production of ethylene oxide

The invention relates to ethylene oxide catalysts containing silver, alkali metal promoters, rhenium promoters and optionally rhenium co-promoters selected from sulfur, molybdenum, tungsten, chromium and mixtures thereof supported on a carrier consisting of at least 85 percent by weight of alpha alumina, from about 0.01 to about 6 percent by weight (measured as the oxide) of an added alkaline earth metal in the form of an oxide, from about 0.01 to about 5 percent by weight (measured as the dioxide) of added silicon in the form of an oxide and from zero to about 10 percent by weight (measured as the dioxide) of added zirconium in the form of an oxide. The invention also relates to an ethylene oxide process using the above catalyst.

The invention relates to ethylene oxide catalysts containing silver, alkali metal promoters, rhenium promoters and optionally rhenium co-promoters selected from sulfur, molybdenum, tungsten, chromium and mixtures thereof supported on a carrier consisting of at least 85 percent by weight of alpha alumina, from 0.05 to 6 percent by weight (measured as the oxide) of an added alkaline earth metal in the form of an oxide, from 0.01 to 5 percent by weight (measured as the dioxide) of added silicon in the form of an oxide and from zero to 10 percent by weight (measured as the dioxide) of added zirconium in the form of an oxide. The invention also relates to an ethylene oxide process using the above catalyst.

Ethylene oxide catalyst and process for its preparation and use

PURPOSE: To provide a silver-contg. catalyst suitable for prepn. of ethylene oxide and a process for prepn. of ethylene oxide using the catalyst. CONSTITUTION: An ethylene oxide catalyst contains silver, an alkali metal promoter, a rhenium promoter, and if necessary an rhenium co-promoter selected from sulfur, molybdenum, tungsten, chromium and mixtures thereof supported on a carrier consisting of at least 85 wt.% of α-alumina, 0.05-6 wt.% (measured as the oxide) of added alkaline earth metal in the form of an oxide, 0.01-5 wt.% (measured as the dioxide)of added silicon in the form of an oxide and 0-10 wt.% (measured as the dioxide) of added zirconium in the form of an oxide.

Ethylene oxide catalyst and method

FIELD: catalyst for production of ethylene oxide. SUBSTANCE: catalyst for production of ethylene oxide contains silver and one or several promoters from alkali metal applied to carrier whose crushing strength is at least 2-3 kg and definite bulk density of at least 0.48 kg/l, which includes the first and second components of alpha-aluminum oxide. In this case, the first component of alpha-aluminum oxide in the form of particles having average size of crystallites of 0.4-4 mcm amounts from 95 to 40% of total weight of alpha-aluminum oxide in carrier; the second component of alpha-aluminum oxide produced in situ by sol-gel process makes up the remaining amount of alpha-aluminum oxide in carrier. Titanium oxide is optionally added to carrier. The invention also covers description of the method of producing carrier of the catalyst. Catalyst have unique carrier from aluminum oxide . EFFECT: improved selectivity and/or activity. 17 cl, 6 tbl

Buffum John Edward

Papers

Ethylene oxide catalyst

Ethylene oxide catalyst and process for its preparation and use

Ethylene oxide catalyst and method

Catalyst for vapor-phase epoxidation of olefins and method of production of catalyst carrier