预处理方法对Ru/SBA-15催化丙三醇氢解反应性能的影响

催化学报 , 2014, (5): 677-683. doi: 10.1016/S1872-2067(14)60032-2

预处理方法对Ru/SBA-15催化丙三醇氢解反应性能的影响

1.清华大学化学系，有机光电子与分子工程教育部重点实验室，北京100084

2.清华大学化学系，有机光电子与分子工程教育部重点实验室，北京100084; 清华大学防化指挥工程学院，北京102205

3.清华大学化学系，有机光电子与分子工程教育部重点实验室，北京100084

4.清华大学化学系，有机光电子与分子工程教育部重点实验室，北京100084

基金项目: the Analytical Foundation of Tsinghua University of China 国家自然科学基金(20973098,21033004) 清华大学分析测试基金.This work was supported by the National Natural Science Foundation of China(20973098,21033004)

关键词：钌 , 负载型催化剂 , 丙三醇 , 氢解反应 , 预处理 , 结构敏感反应

Influence of pretreatment on the catalytic performance of Ru/SBA-15 catalysts for glycerol hydrogenolysis

Keywords： Ruthenium , Supported catalyst , Glycerol , Hydrogenolysis , Pretreatment , Structure sensitive reaction

使用浸渍法结合不同预处理方法制备了一系列的Ru/SBA-15催化剂，并将其应用于丙三醇氢解反应中。使用N2吸附-脱附、X射线衍射、CO化学吸附以及透射电子显微镜等方法对所制备Ru/SBA-15进行了表征。结果表明，催化剂前驱体经过空气焙烧后再经H2还原的Ru/SBA-15催化剂上Ru的分散度较低，而直接使用H2处理较高。同时，随着H2还原温度提高， Ru分散度逐渐降低。保持反应活性接近时，随着Ru分散度的降低， TOF增加。表明Ru/SBA-15催化剂上丙三醇氢解是结构敏感反应。

Ru/SBA-15 catalysts were prepared by impregnation and were pretreated under different condi-tions, and were characterized by N2 adsorption-desorption, X-ray diffraction, CO chemisorption, transmission electron microscopy, and the reaction of glycerol hydrogenolysis. The catalyst calcined in air had larger Ru particles, while the direct reduction of the catalysts with H2 without air pre-calcination made the Ru particles dispersed well. As the H2 reduction temperature increased, the Ru dispersion decreased. The turnover frequency (TOF) of the catalysts increased as the Ru dispersion decreased, indicating that Ru/SBA-15 catalyzed glycerol hydrogenolysis is a structure sensitive reaction.

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