Influence of the conditions of cooling of a nickel-alumina alloy on activity of the skeletal nickel catalyst produced

Abstract

Hydrogenation of glucose in distilled water and in buffer solution has been performed with promoted Raney nickel catalysts. The catalysts have been prepared from Ni2-xMx Al3, (where M = Cr,Fe,Co,Cu,Mo and x ≤ 0.4). The promoter metal, with thf 'exception of cobalt, favours aluminum retention in the catalyst, this high residual aluminum content could be partially responsible for the increase of the nickel activity observed in the presence of a metal M. Iron which is the most efficient promoter loses totally its activity in phosphate buffer at pH 6.1. The activity of Cr or Mo promoted nickel catalyst is about twice that of the unpromoted Raney nickel; in phosphate buffer the activity of these catalysts is enhanced but remains similar to that of the Raney nickel. Cobalt and copper present in small amounts do not change the properties of the Ni-Al system.