PROCESS FOR PREPARING A GROUP VIII-METAL CONTAINING CATALYST, USE THEREOF FOR PREPARING AN ALKENYL CARBOXYLATE

摘要

A process for preparing a catalyst which process comprises the steps of (a) selecting a carrier which is a silica based carrier which has been subjected to a series of washings with one or more aqueous liquids consisting of aqueo us liquids which have a pH of least 3, when measured at 20~C, or which is a silica based carrier which is formed from materials one or more of which hav e been subjected to a said series of washings,(b) precipitating a Group 8 meta l compound onto the carrier, (c) converting the precipitated Group 8 metal compound into metallic species, and (d) subjecting the Group 8 metal/carrier composition to a purification treatment, before or after step (c); a catalys t which is obtainable by this process; and a process for preparing an alkenyl carboxylate comprising reacting a mixture comprising an olefin, a carboxylic acid and oxygen in the presence of the catalyst.