No abstract

No abstract

In this work, Au nanoparticles are loaded on TiO 2 nanocrystals with different crystal planes exposed ({100}, {101}, and {001} planes) to investigate the crystal-plane effect on the catalytic properties of Au/TiO 2 catalyst. Kinetic studies of CO oxidation show that the catalytic activities of three asprepared Au/TiO 2 samples follow this order: Au/TiO 2 -{100} > Au/TiO 2 -{101} > Au/TiO 2 -{001}. Furthermore, different mechanisms exist at low temperatures (<320 K) and high temperatures (>320 K). With the help of ex-situ XPS and in situ DRIFTS, the interactions between substrate molecules and different Au/TiO 2 interfaces are investigated. We find that the activation of O 2 and the formation and desorption of carbonates are greatly dependent on the crystal planes of the TiO 2 support. Furthermore, we use CO oxidation as a probe reaction to study the relationships between surface structures and catalytic properties in Au/TiO 2 . The catalytic behaviors of three Au/TiO 2 catalysts are well correlated with the spectroscopic results. On the basis of this work, we believe that tuning the crystal plane of TiO 2 support will be an effective strategy to control the catalytic properties of Au/TiO 2 .

No abstract

No abstract