Abstract
For the design of a high-performance platinum group metal-free three-way catalyst, we propose a new C3H6-preferential oxidation (C3H6-PROX) catalyst under stoichiometric automobile exhaust gas (NOCOC3H6O2) using supported vanadia catalysts. Among various V2O5 supported catalysts, V2O5/TiO2 (anatase, coverage of around one monolayer) showed the best activity for C3H6-PROX with preferable formation of CO. The tandem catalyst combination using V2O5/TiO2 as the upstream C3H6-PROX catalyst and Cu/CeO2 as the downstream NOCO reaction catalyst showed comparable activity for NO reduction as a Rh/ZrO2 catalyst. The reaction mechanism of C3H6 oxidation was analyzed using in situ Infrared spectroscopy. The C3H6 oxidation progressed with the formation of surface acetate as an intermediate, and acetate consumption was the key step of C3H6 oxidation. It is suggested that the Brønsted acid promoted the cleavage of the CC bond of acetate, therefore, the number of Brønsted acid sites is one of the critical factors for the higher performance of C3H6-PROX catalysts.
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