Abstract
IR and TPD data suggest that ultra-dispersed Co catalysts (~10 – 20 Å) prepared via thermal decomposition of supported Co carbonyl complexes have a lower reactivity towards CO dissociation and a higher stability towards carbonization in a CO and/or CO-H 2 mixture compared to low-dispersed Co catalysts. The Co catalysts studied have at least two surface carbon species which differ in reactivity as shown by a radioisotopic study ( 14CO) of the carbonization catalysts. The ultra-dispersed Co particles are characterized by an essentially lower surface carbon coverage than the large particles. It has been assumed that the limited CO dissociation on dispersed Co particles, as compared to large ones, is caused by electron and geometric effects as well as by a greater modification of their properties brought about by oxygen and carbon atoms which appear after dissociation of the initially adsorbed CO molecules. Different types of CO adsorption on Co particles having different sizes determine their specific catalytic activity and selectivity towards CO hydrogenation.
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