Abstract
The effects of additives such as K, B, and P to Ru Al 2O 3 catalysts were investigated with regard to the adsortion and the catalytic hydrogenation of CO. Thermal desorption of CO and infrared bands of CO adsorbed indicated that the addition of K increased the strength of CO adsorption, by enhancing the back-donation from Ru to CO. As for the catalytic hydrogenation of CO, the addition of K significantly increased the olefin/paraffin ratios in product hydrocarbons and suppressed the methane formation, while the catalytic activity decreased by the addition. On the other hand, the addition of P or B brought about opposite changes in both CO adsorption and CO hydrogenation. The relationships between the electronic state of Ru and the activity and selectivity for this reaction have been interpreted on the basis of the inhibiting effect of strongly adsorbed CO for the hydrogenation.
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