Zheng Zhanfeng, Jia Jianfeng, Zhong Ziyi
J Nanosci Nanotechnol. 2014 Sep;14(9):6885-93. doi: 10.1166/jnn.2014.8943.
This work aims to understand the influence of TiO2 surface structure in Au/TiO2 catalysts on CO oxidation. Au nanoparticles (3 wt%) in the range of 4 to 8 nm were loaded onto four kinds of TiO2 surfaces, which had different surface structures and were synthesized by calcining hydrogen titanate nanotubes at various temperatures and in different atmospheres. The Au catalyst supported on anatase nanorods exhibited the highest activity in CO oxidation at 30 degrees C among all the five Au/TiO2 catalysts including the reference catalyst of Au/TiO2-P25. X-ray photoelectron spectroscopy (XPS) and infrared emission spectra (IES) results indicate that the anatase nanorods have the most active surface on which water molecules can be strongly adsorbed and OH groups can be formed readily. Theoretical calculation indicates that the surface OH can facilitate the O2 adsorption on the anatase surface. Such active surface features are conducive to the O2 activation and CO oxidation.
这项工作旨在了解金/二氧化钛催化剂中二氧化钛表面结构对一氧化碳氧化的影响。将粒径在4至8纳米范围内的金纳米颗粒（3重量%）负载到四种具有不同表面结构的二氧化钛表面上，这些二氧化钛表面是通过在不同温度和不同气氛下煅烧钛酸氢纳米管合成的。在包括金/二氧化钛-P25参比催化剂在内的所有五种金/二氧化钛催化剂中，负载在锐钛矿纳米棒上的金催化剂在30℃下的一氧化碳氧化反应中表现出最高活性。X射线光电子能谱（XPS）和红外发射光谱（IES）结果表明锐钛矿纳米棒具有最活跃的表面，水分子能够在其上强烈吸附并易于形成羟基。理论计算表明表面羟基能够促进氧气在锐钛矿表面的吸附。这种活跃的表面特性有利于氧气的活化和一氧化碳的氧化。
