Effect of Thermal Activation of Supported Catalysts Pt/MeO_x, Where MO_x = Al_2O_3, CeO_2, La_2O_3, and ZrO_2, for Complete Oxidation

摘要

A sharp increase in the atomic catalytic activity (ACA) of supported platinum catalysts in the model reaction of n-pentane complete oxidation is found on going from the preliminary calcination temperature of 500-600 ℃ to a temperature of 700 ℃, ACA increases by an order of magnitude for the Pt/γ-Al_2O_3 system, ～3 times for Pt/ZrO_2, and ～1.5 times for Pt/CeO_2. The per-gram activities of all catalysts decrease because of a decrease in the dispersion of supported platinum with an increase in the temperature of preliminary calcination.