Carbon Monoxide Adsorption Studies on an Ru:Mn Bimetallic Alloy System for the Determination of Active Metal Sites

Abstract

A supported ruthenium:manganese bimetallic alloy system dispersed on a high surface area alumina support was prepared by the co-impregnation method. The adsorption of CO at atmospheric pressure was carried out in order to determine the number of active metal sites present. The data indicate that manganese was present as a covering layer on the surface of the ruthenium. With increasing manganese loading decreasing adsorption of CO was observed, indicating that the presence of manganese masked the active ruthenium sites responsible for CO adsorption. No CO adsorption occurred on isolated manganese sites. The data were interpreted in terms of the geometric and possible electronic effects caused by the addition of manganese.