催化学报

催化学报 ›› 2007, Vol. 28 ›› Issue (11): 999-1002.

• 研究论文 • 上一篇    下一篇

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

石利红1,2,李德宝1,侯博1,孙予罕1   

  1. 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, 山西太原 030001; 2 中国科学院研究生院, 北京 100049
  • 收稿日期:2007-11-25 出版日期:2007-11-25 发布日期:2011-10-13

Organic Modification of SiO2 and Its Influence on the Properties of Co-Based Catalysts for Fischer-Tropsch Synthesis

SHI Lihong1,2, LI Debao1, HOU Bo1, SUN Yuhan1*   

  1. 1 State Key Laboratory of Coal Conversion, Institute of Coal Chemistry, The Chinese Academy of Sciences, Taiyuan 030001, Shanxi, China; 2 Graduate University of Chinese Academy of Sciences, Beijing 100049, China
  • Received:2007-11-25 Online:2007-11-25 Published:2011-10-13

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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.

关键词: 钴, 二氧化硅, 有机改性, 费托合成

Abstract: 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-raydiffraction, and temperature-programmed reduction. The results showed that the organic modification of SiO2 reduced the surface 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.

Key words: cobalt, silica, organic modification, Fischer-Tropsch synthesis