The present invention relates to a catalyst for the selective hydrogenation of an unsaturated compound, based on a noble metal and/or a noble-metal oxide on an aluminum oxide support, and to a process for the preparation of the catalyst. The present invention further relates to a process
A nickel/aluminum oxide catalyst having a nickel content from 10 to 60% by weight, based on the total catalyst, in which the nickel is in the form of crystallites having an average diameter ranging from 15 nm to 50 nm.