SBA-15的硅烷化对钴基催化剂费-托合成性能的影响(英文)  

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

作　　者：闪媛媛[1] 刘光荣[1] 李金林[1] 

机构地区：[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

出　　处：《催化学报》2009年第11期1091-1095,共5页

基　　金：Foundation item: Supported by the National Natural Science Foundation of China (20590360 and 20773166)

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.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 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.

关 键 词：硅烷化 SBA-15 钴基催化剂 费-托合成 三甲基硅基 

分 类 号：O643.36[理学—物理化学]