有机改性二氧化硅及其负载钴催化剂的费托合成反应性能  

Organic Modification of SiO_2 and Its Influence on the Properties of Co-Based Catalysts for Fischer-Tropsch Synthesis

作　　者：石利红[1] 李德宝[1] 侯博[1] 孙予罕[1] 

机构地区：[1]中国科学院山西煤炭化学研究所煤转化国家重点实验室

出　　处：《催化学报》2007年第11期999-1002,共4页

基　　金：国家重点基础研究发展规划(2005CB221402).

摘　　要：利用硅烷化作用分别制得了甲基、二甲基和三甲基改性的SiO2载体,采用等体积浸渍法制备了质量分数为5%的一系列负载型钴催化剂.考察了有机改性对催化剂费托合成催化性能的影响.结果表明,SiO2经有机基团改性后,表面硅羟基浓度减小,削弱了钴硅之间的相互作用,促进了催化剂的还原,提高了催化剂的活性,降低了甲烷选择性.由于空间位阻不同,不同有机基团改性的SiO2的表面硅羟基浓度不同,催化剂活性随着表面硅羟基浓度的减小而提高.SiO2 was modified by various organic groups before the impregnation of the cobalt precursor. These modified supports and the corresponding catalysts were characterized by IR spectroscopy, X-ray diffraction, and temperature-programmed reduction. The results showed that the organic modification of SiO2 reduced the sur- face silanol （Si-OH） concentration of SiO2 support, suppressed the interaction between cobalt and silica, enhanced the reduction of the supported cobalt, and thus increased the catalytic activity of Co catalysts for Fischer- Tropsch synthesis. Moreover, SiO2 modified by different organic groups had different surface silanol concentration due to steric hindrance and the catalytic activity increased with the decrease of surface silanol concentration.

关 键 词：钴 二氧化硅 有机改性 费托合成 

分 类 号：O643.36[理学—物理化学]