Synergistic Mechanism of Platinum-GaO Catalysts for Propane Dehydrogenation.

The synergy between metals and metal oxides can effectively improve the heterogeneous catalytic process. This paper describes the intrinsic effect of Pt modification over GaO (Pt-GaO ) on propane dehydrogenation. The presence of Pt promotes H dissociation and surface coverage of hydrogen species, which is beneficial for the activation of C-H in propane. With excessive Pt, Ga can be further reduced to form Pt-Ga alloy with less surface hydrogen species. Consequently, the relative propylene formation rate between Pt-GaO and the summed contribution of individual Pt and GaO increases linearly with the content of hydrogen species. Optimally, the relative propylene formation rate of Pt-GaO with 0.03 wt % Pt exceeds 25 % of the summed contribution of individual components.