Hydrogenation catalyst, its preparation and use

摘要

The present invention discloses a hydrogenation catalyst comprising metallic palladium supported on activated carbon support, wherein the penetration depth of metallic palladium in the support is at least about 10 mum and up to about 100 mum, the crystallite size of palladium is between about 40 Å and about 120 Å, and the palladium in the surface layer from the surface of support to a depth of 1 mum is from about 5% to about 40% based on the total atom number of palladium and other elements. The present invention further discloses a process for preparing the hydrogenation catalyst, and a use of said hydrogenation catalyst in the purification of crude terephthalic acid.