Study on bimodal mesoporous Co/SiO2 catalysts for the Fischer–Tropsch synthesis

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• 作者：Cuili Guo (1)
  Yuanyuan Wu (1)
  Jishan Zhan (1)
  
• 关键词：Fischer–Tropsch synthesis ; Co/SiO2 ; Co catalyst ; Bimodal mesoporous
• 刊名：Reaction Kinetics, Mechanisms and Catalysis
• 出版年：2013
• 出版时间：August 2013
• 年：2013
• 卷：109
• 期：2
• 页码：497-508
• 全文大小：321KB
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• 作者单位：Cuili Guo (1)
  Yuanyuan Wu (1)
  Jishan Zhan (1)
  
  1. School of Chemical Engineering and Technology, Tianjin University, Tianjin, 300072, China
  

文摘

A series of SiO2 supports were prepared with the sol–gel method. Bimodal mesoporous Co/SiO2 catalysts with different pore size distributions were prepared. The samples were characterized by means of N2 adsorption–desorption, powder X-ray diffraction, H2-chemisorption, H2 temperature programmed reduction and Raman spectroscopy. The catalysts were employed in Fischer–Tropsch synthesis under the reaction conditions of 240?°C, 2?MPa and 1,000?h? to investigate their catalytic performance with different pore diameters. The experimental results revealed that the bimodal catalysts contain high specific surface area contributed from the formation of smaller mesopores during sol–gel process. Small Co particles of bimodal catalyst are able to be highly dispersed and behave moderate metal-support interaction without formation of hardly reducible species, which favors the production of sufficient active centers, contributing to the high catalytic activity. Moreover, increasing the pore size of the larger pores in bimodal mesoporous catalysts will facilitate the transportation of primary products and inhibit the hydrocracking to generate light hydrocarbons, promoting the production of heavy hydrocarbons with high C5+ selectivity.