CO HYDROGENATION OVER NI-BASED AND CO-BASED CATALYSTS - INFLUENCE OF ALKALI ADDITION ON MORPHOLOGICAL AND CATALYTIC PROPERTIES

CO hydrogenation over sodium-promoted nickel and cobalt catalysts was studied to better understand the specific effects of the alkali modifi er. The main catalytic effects were assigned to the weakening of the h ydrogenating ability of the metals, resulting from their transformatio n into bulk carbide phases. The easy CO dissociation resulting from a direct interaction with the alkali ions is proposed to explain the met al phase transformation.