Reciprocal regulation between support defects and strong metal-support interactions for highly efficient reverse water gas shift reaction over Pt/TiO2 nanosheets catalysts

作者：Chen, Ziyang; Liang, Long; Yuan, Huan; Liu, Huan; Wu, Peng; Fu, Mingli; Wu, Junliang; Chen, Peirong; Qiu, Yongcai; Ye, Daiqi; Chen, Limin^*

来源：Applied Catalysis B: Environmental , 2021, 298: 120507.

DOI：10.1016/j.apcatb.2021.120507

• TiO2 nanosheets
• Doped-N
• Bulk Ti3+
• Surface defects
• Strong metal-support interaction (SMSI)

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.