Abstract
IR spectroscopy of adsorbed pyridine, and temperature-programmed desorption (TPD) of hydrogen and deuterium were studied for several solid acid catalysts to examine whether the formation of protonic acid sites from hydrogen molecules occurs and promotes acid-catalyzed reactions. The catalysts examined were Co.Mo/SiO 2 -Al 2 O 3 , Co.Mo/Al 2 O 3 , SiO 2 -Al 2 O 3 , H-ZSM-5, physical mixture of Pt/SiO 2 and H-ZSM-5, and Pt/SO 4 2 -ZrO 2 , and the reaction chosen was cumene cracking. For all catalysts, the formation of protonic acid site was observed by heating in the presence of hydrogen, and the amount of hydrogen (or deuterium) adsorbed increased as the adsorption temperature was raised. The promotion effects of hydrogen on the catalytic activity for cumene cracking were observed for the catalysts containing metallic components. The concept “molecular hydrogen-originated protonic acid site” is proposed.
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