Catalysts having enhanced stability, efficiency and/or activity for alkylene oxide production
View Patent ↗A catalyst for the manufacture of alkylene oxide, for example ethylene oxide, by the vapor-phase epoxidation of alkene containing impregnated silver and at least one efficiency-enhancing promoter on an inert, refractory solid support, said support incorporating a sufficient amount of zirconium component (present and remaining substantially as zirconium silicate) as to enhance at least one of catalyst activity, efficiency and stability as compared to a similar catalyst which does not contain the zirconium component.
1. A process for preparing a catalyst for the epoxidation of an olefin comprising:
incorporating fluoride anions and zirconium silicate into alumina;
calcining the alumina at a temperature between 1000° C. and 1400° C. to form a carrier comprising alpha-alumina; and
subsequently depositing a catalytic species comprising silver onto the carrier.
2. A process for preparing a catalyst for the epoxidation of an olefin comprising:
incorporating fluoride anions and zirconium silicate into alumina;
calcining the alumina at a temperature between 1000° C. and 1400° C. to form a carrier comprising alpha-alumina; and
subsequently depositing silver and rhenium components onto the carrier.