OALib Journal期刊
La2O3助剂对Au/TiO2催化肉桂醛选择性加氢性能的影响
DOI: 10.3724/SP.J.1088.2011.10223
Keywords: 金 ,负载型催化剂 ,氧化镧 ,助剂 ,肉桂醛 ,选择性加氢 ,肉桂醇
Abstract:
？以溶胶-凝胶法制得的TiO2和La2O3-TiO2为载体,采用沉积-沉淀法制备了一系列Au催化剂,用于肉桂醛选择性加氢反应,并运用N2吸附-脱附、X射线衍射、高分辨率透射电镜、程序升温还原和X射线光电子能谱等方法对催化剂进行了表征,系统考察了La2O3含量对Au/TiO2催化剂物化性质和催化性能的影响.结果表明,适量La2O3助剂(10%~15%)的掺杂可显著提高Au/TiO2催化剂的加氢活性和肉桂醇选择性.表征结果显示,La2O3的加入可增大催化剂的比表面积,抑制TiO2晶粒长大,增强Au与载体间的相互作用,提高催化剂表面Au纳米粒子尺寸的均匀度;Au/TiO2催化剂表面的Au物种主要以Au0存在,而在La2O3掺杂的Au/TiO2催化剂表面还存在少量的Au3+物种.
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