催化学报

催化学报 ›› 2009, Vol. 30 ›› Issue (11): 1091-1095.

• 研究论文 • 上一篇    下一篇

SBA-15的硅烷化对钴基催化剂费-托合成性能的影响

闪媛媛, 刘光荣, 李金林   

  1. 中南民族大学催化材料科学湖北省暨国家民委-教育部共建重点实验室, 湖北武汉430074
  • 收稿日期:2009-11-25 出版日期:2009-11-25 发布日期:2013-07-17

Effect of Silylation of SBA-15 on Its Supported Cobalt Catalysts for Fischer-Tropsch Synthesis

SHAN Yuanyuan, LIEW Kongyong, LI Jinlin*   

  1. Key Laboratory of Catalysis and Materials Science of the State Ethnic Affairs Commission and Ministry of Education, South-Central Uni-versity for Nationalities, Wuhan 430074, Hubei, China
  • Received:2009-11-25 Online:2009-11-25 Published:2013-07-17

PDF

949

被引次数

19

摘要： 以未硅烷化和硅烷化的 SBA-15 为载体, 采用满孔浸渍法制备了钴基费-托合成催化剂, 通过元素分析、N2 吸附-脱附、X 射线衍射、H2 程序升温还原、H2 程序升温脱附以及氧滴定等手段对催化剂进行了表征. 催化剂的费-托合成活性测试在固定床反应器上进行. 研究表明, 对于 SBA-15 硅烷化后制备的催化剂, 金属钴与载体之间的相互作用降低, 氧化钴的还原度增加. 随着三甲基氯硅烷用量的增加, 三甲基硅基的表面覆盖度增加, 钴的晶粒直径增大. 硅烷化后的催化剂的高活性归因于高的还原度, 而 C5+ 选择性的增加则归因于钴晶粒直径的增大.

关键词: 硅烷化, SBA-15, 钴基催化剂, 费-托合成, 三甲基硅基

Abstract: Cobalt catalysts supported on unsilylated and silylated SBA-15 were prepared by incipient wetness impregnation and characterized by elemental analysis, N2 adsorption-desorption, X-ray diffraction, H2 temperature-programmed reduction, H2 temperature-programmed desorption, and oxygen titration. Their catalytic properties for Fischer-Tropsch synthesis were evaluated in a fixed-bed reactor. The results show that the interaction between cobalt and the support was decreased, and the reducibility of the cobalt oxide species was more facile on the silylated Co/SBA-15 catalyst. With increasing (CH3)3SiCl loading, the surface coverage of the trimethylsilyl group increased, and the cobalt cluster size was larger. The higher activity of the silylated 10%Co/SBA-15 catalysts was ascribed to its improved reducibility. The increase in selectivity for C5+ hydrocarbons was attributed to the increase in cobalt cluster size.

Key words: silylation, SBA-15, cobalt-based catalyst, Fischer-Tropsch synthesis, trimethylsilyl