Synergistic Mechanism of Platinum-GaO x 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 x (Pt-GaO x ) on propane dehydrogenation. The presence of Pt promotes H 2 dissociation and surface coverage of hydrogen species, which is beneficial for the activation of C-H in propane. With excessive Pt, Ga δ+ can be further reduced to form Pt-Ga alloy with less surface hydrogen species. Consequently, the relative propylene formation rate between Pt-GaO x and the summed contribution of individual Pt and GaO x increases linearly with the content of hydrogen species. Optimally, the relative propylene formation rate of Pt-GaO x with 0.03 wt % Pt exceeds 25 % of the summed contribution of individual components.