The role of the oxidic support on the deactivation of Pt catalysts during the CO2 reforming of methane

Abstract

Pt supported on y-Al2O3, TiO2 and ZrO2 are active catalysts for the CO2 reforming of methane to synthesis gas. The stability of the catalysts increased in the order Pt / y-Al2O3 < Pt / TiO2 < Pt / ZrO2. For all catalysts, the decrease in activity with time on stream is caused by carbon formation, which blocks the active metal sites for reaction. With Pt / TiO2 and Pt / ZrO2, deactivation started imediately after the start of the reaction, While the Pt / y-Al2O3 catalyst showed an induction period during which carbon was accumulated without affecting the catalytic activity.