催化学报

催化学报 ›› 2011, Vol. 32 ›› Issue (7): 1269-1274.DOI: 10.3724/SP.J.1088.2011.10223

• 研究论文 • 上一篇    下一篇

La2O3 助剂对 Au/TiO2 催化肉桂醛选择性加氢性能的影响

刘迎新1,*, 孟令富１, 魏作君２, 时洪涛１   

  1. １浙江工业大学催化加氢研发基地, 浙江杭州 310032; 2浙江大学化学工程与生物工程学系, 浙江杭州 310027
  • 收稿日期:2011-02-21 修回日期:2011-04-27 出版日期:2011-07-18 发布日期:2014-11-28

Effect of La2O3 Promoter on the Performance of Au/TiO2 Catalyst for Selective Hydrogenation of Cinnamaldehyde

LIU Yingxin1,*, MENG Lingfu1, WEI Zuojun2, SHI Hongtao1   

  1. 1Research and Development Base of Catalytic Hydrogenation, Zhejiang University of Technology, Hangzhou 310032, Zhejiang, China; 2Department of Chemical and Biological Engineering, Zhejiang University, Hangzhou 310027, Zhejiang, China
  • Received:2011-02-21 Revised:2011-04-27 Online:2011-07-18 Published:2014-11-28

PDF

1074

被引次数

28

摘要： 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.

关键词: 金, 负载型催化剂, 氧化镧, 助剂, 肉桂醛, 选择性加氢, 肉桂醇

Abstract: Using TiO2 and La2O3-doped TiO2 as supports, which were prepared by the sol-gel method, a series of Au catalysts were prepared by the deposition-precipitation method. Their catalytic performance for selective hydrogenation of cinnamaldehyde was tested and their physical and chemical properties were investigated by the techniques of N2 adsorption-desorption, X-ray diffraction, high-resolution transmission electron microscopy, temperature-programmed reduction, and X-ray photoelectron spectroscopy. The results show that a moderate amount of La2O3 (10%–15%) can obviously improve the catalytic activity and selectivity of Au/TiO2 for the hydrogenation. The presence of La2O3 in TiO2 increases its surface area, restrains the growth of TiO2 crystallites, enhances the interaction between Au and support, and makes the particle size distribution of Au crystallites more evenly. The Au on the surface of Au/TiO2 exists mainly as Au0, but on the La2O3 doped catalyst there is a small portion of Au3+ species besides Au0.

Key words: gold, supported catalyst, lanthanum oxide, promoter, cinnamaldehyde, selective hydrogenation, cinnamyl alcohol