预处理方法对Ru/SBA-15催化丙三醇氢解反应性能的影响

摘要

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.