【摘要】 制备了高分散性负载型5%Ru/C催化剂,采用X射线衍射、X射线光电子能谱和高分辨透射电镜对催化剂进行了表征.结果表明,所制得的5%Ru/C催化剂分散度高,金属钌的平均粒径小于5nm.在喹啉加氢反应中,催化剂显示出很高的催化活性和生成1,2,3,4-四氢喹啉的选择性,但未检测到十氢喹啉生成.补加新鲜催化剂后,1,2,3,4-四氢喹啉可全部转化为十氢喹啉.对喹啉加氢机理进行了探讨.更多还原

【Abstract】 A highly dispersed Ru-containing catalyst (5%Ru/C) was prepared and characterized by X-ray diffraction, X-ray photoelectron spectroscopy, and high resolution transmission electron microscopy. The results showed that ruthenium was reduced to zero valence, and the average particle diameter of Ru crystallites was smaller than 5 nm. The ruthenium-based catalyst exhibited the highest activity for the hydrogenation of quinoline compared with other activated carbon-supported catalyst. Under the optimum reaction conditions of 100 ℃, p(H2)=3.0 MPa, and Ru/quinoline molar ratio of 4/1 000, the main product obtained was the partially hydrogenated 1,2,3,4-tetrahydroquinoline, and the selectivity was up to 98.5%. The decahydroquinoline was not found in the products. However, after the fresh 5%Ru/C catalyst was added, 1,2,3,4-tertrahydroquinoline was completely transformed to decahydroquinoline. The mechanism of quinoline hydrogenation was also discussed.更多还原