| 摘要 |
A catalyst effective for the production of vinyl acetate by reaction of ethylene, oxygen and acetic acid, comprising a porous support on the porous surfaces of which is deposited catalytically effective amounts of metallic palladium and gold, and optionally, one or more additional catalytically active metals such as copper, prepared by steps comprising impregnating the support with one or more aqueous solutions, of water-soluble compounds of the metals, fixing the metals on the support as water-insoluble compounds in one or more fixing steps by reaction with an appropriate alkaline compound, at least one of said fixing steps being carried out in a solution of the alkaline compound in which the impregnated support is immersed, while sonicating, i.e., applying ultrasound waves to, such solution, and reducing the water-insoluble compounds of the catalytically active metals to their free metallic form.
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