Reciprocal Regulation Between Support Defects And Strong Metal-Support Interactions For Highly Efficient Reverse Water Gas Shift Reaction Over Pt/Tio2 Nanosheets Catalysts

Strong metal-support interaction (SMSI) is regarded as one of the most important concepts in heterogeneous catalysis; however, few researches are focused on SMSI regulating the support structure, properties and their roles on the catalytic performance. Herein, anatase TiO2{001} nanosheets pretreated in different atmosphere were used to load Pt for reverse water gas shift reaction. The Pt/N-doped TiO2 catalysts exhibited significantly superior catalytic performance. The investigation demonstrated that defects and doped-N enhance the Pt dispersion while Pt and SMSI in turn promote defects regeneration during activation in H-2. During reaction, surface defects enable CO2 activation to generate active intermediates which easily decompose into CO. Furthermore, the small Pt particles and SMSI facilitate H-2 dissociative adsorption and spillover to replenish both surface defects and bulk Ti3+. Besides, a novel reaction route has been observed that the stable bulk Ti3+ in N-doped TiO2 migrate and transform to surface defects, enhancing catalytic performance.