Hydrogenation of aromatic hydrocarbons in a mixture with thiophene on sulfided Pd/Al2O3 catalysts

摘要

The activity and stability of aluminum-palladium catalysts in the hydrogenation of aromatic hydrocarbons mixed with thiophene were studied. The catalysts were obtained by impregnation of gamma-A(2)O(3) with aqueous solutions of salts of palladium complexes. Preliminary sulfiding followed by oxidative activation of Pd/Al2O3 catalysts were found to favor the formation of such palladium state on the surface at which the hydrogenation of aromatic hydrocarbons in the presence of sulfur-containing impurities proceeds without a noticeable change in the activity with time. IR spectroscopy showed that the palladium metal surface fragments forming CO complexes with a characteristic absorption band at 1998 cm(-1) are resistant to poisoning with sulfur-containing compounds in the hydrogenation of aromatic hydrocarbons.