Two step gold addition method for preparing a vinyl acetate catalyst
AssigneeHoechst Celanese Corporation
InventorsIoan Nicolau, Azael T. Flores
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Abstract
A method for preparing a catalyst wherein a catalytic carrier is impregnated with water-soluble palladium and gold compounds followed by fixing and then reducing the fixed palladium and gold compounds to palladium and gold metal followed by impregnating the carrier with a second amount of a water-soluble gold compound. The second amount of gold compound is fixed then reduced to gold metal. The catalyst then is impregnated with an alkali metal acetate such as potassium acetate. The catalyst can be employed to synthesize unsaturated esters such as vinyl acetate.
Claims29
In a process for preparing a catalyst for synthesizing unsaturated esters, wherein a catalyst carrier is impregnated with a water soluble palladium compound and a water soluble gold compound, fixing the water soluble palladium compound and the water soluble gold compound to the carrier as a water insoluble palladium compound and a water insoluble gold compound and reducing the water insoluble palladium compound to palladium metal and the water insoluble gold compound to gold metal, the improvement comprising impregnating and fixing the water soluble gold compound in two steps, wherein a first amount of the water soluble gold compound is impregnated on the carrier and then fixed to the carrier as a first amount of the water insoluble gold compound followed by impregnating the carrier with a second amount consisting essentially of the water soluble gold compound and fixing the second amount of the water soluble gold compound as a second amount of the water insoluble gold compound.
Dependencies are inferred from the claim text.