Promotion and inhibition of hydrogen spillover on Pt/Al 2 O 3 catalysts

1.The deposition of platinum on Al2O3 or zeolites brings about a marked reduction in the temperature required for heteromolecular exchange of deuterium with the surface hydroxyl groups of the aluminum oxide.2.Heteromolecular exchange and hydrogen spillover are highly sensitive to changes in the degree of purity of the metal surface and the conditions of preliminary treatment of the Pt/Al2O3 catalyst. Preliminary adsorption of hydrocarbons on the Pt/Al2O3 catalyst inhibits, and oxidational treatment promotes, the exchange of D2 with the surface OH groups.