CARBON-DIOXIDE HYDROGENATION OVER IRON-CONTAINING CATALYSTS

Iron silicalite samples with a different degree of crystallinity have been synthesized and characterized. Reduced samples were then tested a s catalysts for carbon dioxide hydrogenation. It is observed that when ever the zeolitic phase is present, reduction of the iron species is s trongly encumbered. As a consequence, over such catalysts the reverse water-gas shift reaction occurs specifically while formation of hydroc arbons does not occur. This is attributed to the lack of formation of surface carbidic species which appear to be responsible for the hydroc arbon formation.