Adsorption of Hydrogen and Carbon Monoxide by Palladium-Silica Alumina Catalysts

Abstract

The adsorption of hydrogen and carbon monoxide by palladium supported on silicaialumina and the reaction of the adsorbed hydrogen with gaseous ethylene were investigated at 20° C. The desorption process of the adsorbed carbon monoxide was examined by means of the secondary isotherms, and it was found that CO is adsorbed in two states, strongly adsorbed CO and weakly adsorbed CO. The result of the co-adsorption of hydrogen and carbon monoxide shows that the main adsorbed species in the presence of both gases are strongly adsorbed CO and weakly adsorbed Ha (including dissolved H). The strongly adsorbed H is readily reacted with gaseous ethylene to form ethane quantitatively.