Abstract
Reactions of CO H 2 mixtures have been studied on a series of Pd SiO 2 catalysts (2 wt% Pd) with and without a promoting additive. Mg and La compounds were used as promoters. It appeared that promoters (i) influence the activity of the catalysts and (ii) increase the selectivity for “oxygenates” and suppress the selectivity for CH 4. The activity for methanol synthesis is linearly correlated with the amount of Pd extractable from the reduced and used catalysts as Pd-acetylacetonate. Since it is known that promoters also create a new type of ionic adsorption center for CO and NO adsorption, it is concluded that Pd “ions” are indeed the centers for activation of CO toward methanol whereas Pd metal supplies hydrogen atoms for hydrogenation.
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