Preparation of palladium / gold catalyst on a support when prepared from halide free precursors

摘要

Disclosed is a method of producing a catalyst or pre-catalyst suitable for assisting in the production of alkenyl alkanoates (such as vinyl acetate), comprising: a) contacting at least one catalytic precursor solution comprising palladium and gold to a support material wherein the at least one catalytic precursor solution is an aqueous solution that comprises one or more of Pd(NH3)2(NO2)2, Pd(NH3)4(OH)2, Pd(NH3)4(NO3)2, Pd(NH3)4(OAc)2, Pd(NH3)2(OAc)2, Pd(NH3)2(HCO3)2, NaAuO2, NMe4AuO2, HAu(NO3)4 in nitric acid or combinations thereof, wherein the aqueous solution is substantially free of chlorine; and b) reducing the palladium or gold by contacting a reducing environment to the support material.