Patent ID: 6794332
Filing Date: 2004-09-21
Classification: B01J,C07C

Abstract:
A process for producing a catalyst, which catalyzes a reaction of an alkene, an alkanoic acid and an oxygen-containing gas to produce an alkenyl alkanoate, that comprises support particles impregnated with palladium, gold and a potassium alkanoate, said process comprising the steps in the order of:(a) impregnating the support particles with aqueous solutions of water-soluble palladium and gold compounds so that the weight ratio of palladium to gold is in the range from 2:8 to 8:2; (b) precipitating water-insoluble palladium and gold compounds onto the support particles using alkali metal silicates or hydroxides as a precipitating agent; (c) washing the precipitated support with water until a decant of said wash water is negative to a silver nitrate test; (d) drying the washed precipitated support; (e) heating the dried washed precipitated support in a flow of inert gas from room temperature to 150Â° C. holding the temperature at 150Â° C. for 0.5 to one hour and then increasing the temperature; (f) converting the precipitated water-insoluble palladium and gold compounds to palladium and gold on the support particles using ethylene as a reducing agent at a temperature of greater than 150Â° C. up to 310Â° C., hydrogen as a reducing agent at a temperature of greater than 150Â° C. up to 299Â° C. or nitrogen as a reducing agent at a temperature of greater than 150Â° C. up to 500Â° C.; (g) further impregnating the support particles with said potassium alkanoate to a point of incipient wetness of the support particles; and (h) drying the catalyst.