催化作用
X射线光电子能谱
Crystal(编程语言)
材料科学
基质(水族馆)
解吸
化学工程
纳米晶
单晶
结晶学
纳米技术
化学
物理化学
吸附
有机化学
工程类
地质学
海洋学
程序设计语言
计算机科学
作者
Lichen Liu,Xianrui Gu,Yuan Cao,Xin‐Kan Yao,Lei Zhang,Changjin Tang,Fei Gao,Lin Dong
摘要
In this work, Au nanoparticles are loaded on TiO2 nanocrystals with different crystal planes exposed ({100}, {101}, and {001} planes) to investigate the crystal-plane effect on the catalytic properties of Au/TiO2 catalyst. Kinetic studies of CO oxidation show that the catalytic activities of three as-prepared Au/TiO2 samples follow this order: Au/TiO2-{100} > Au/TiO2-{101} > Au/TiO2-{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/TiO2 interfaces are investigated. We find that the activation of O2 and the formation and desorption of carbonates are greatly dependent on the crystal planes of the TiO2 support. Furthermore, we use CO oxidation as a probe reaction to study the relationships between surface structures and catalytic properties in Au/TiO2. The catalytic behaviors of three Au/TiO2 catalysts are well correlated with the spectroscopic results. On the basis of this work, we believe that tuning the crystal plane of TiO2 support will be an effective strategy to control the catalytic properties of Au/TiO2.
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