Abstract
AbstractThe activity and selectivity of both unsupported Ru and carbon black‐supported Ru catalysts toward the hydrogenation of CO and CO2 have been investigated in order to learn about the effect of metal particle size on both reactions. The specific activity for both reactions decreases with metal particle size and the product distribution obtained in the hydrogenation of CO (the hydrogenation of CO2 only yields methane) is also a function of metal dispersion; thus, the proportion of methane produced increases and the olefin/paraffin decreases with decreasing Ru particle size. This behaviour is attributed to changes in the electronic properties of the Ru crystallites in close contact with the graphitised carbon black used as support.
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