Effect of Silylation and Support Porosity of Co/MCM-41 and Co/SiO2 Catalysts in Fischer–Tropsch Synthesis

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• 作者：Andréia Soares Zola ; Lidiane Sabino da Silva ; Artur Lemes Moretti…
• 关键词：Fischer–Tropsch ; Cobalt species ; Mesoporous silica ; Silylation ; CO hydrogenation ; C5+ hydrocarbons
• 刊名：Topics in Catalysis
• 出版年：2016
• 出版时间：February 2016
• 年：2016
• 卷：59
• 期：2-4
• 页码：219-229
• 全文大小：1,391 KB
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• 作者单位：Andréia Soares Zola (1)
  Lidiane Sabino da Silva (1)
  Artur Lemes Moretti (1)
  Adriano do Couto Fraga (2)
  Eduardo Falabella Sousa-Aguiar (2) (3)
  Pedro Augusto Arroyo (1)
  
  1. Chemical Engineering Department, State University of Maringá, Av. Colombo 5790, Maringá, PR, 87020-900, Brazil
  2. PETROBRAS S.A. CENPES R&D Centre, Cidade Universitária, Av. Horácio Macedo, 950, Cidade Universitária, Rio de Janeiro, RJ, 21.941-915, Brazil
  3. Department of Organic Processes, School of Chemistry, UFRJ – CT, Bloco E, Cidade Universitária, Ilha do Fundão, Rio de Janeiro, RJ, 21941-909, Brazil
  
• 刊物主题：Catalysis; Physical Chemistry; Pharmacy; Industrial Chemistry/Chemical Engineering; Characterization and Evaluation of Materials;
• 出版者：Springer US
• ISSN：1572-9028

文摘

The effect of silylation in the performance of cobalt catalysts supported on mesoporous silica MCM-41 and non-porous silica in Fischer–Tropsch synthesis (FTS) at process conditions (240 °C, 10 bar, H₂/CO ratio = 2.15) was evaluated. Catalysts with a concentration of 5 % metallic phase were synthesized by wet impregnation on silylated and non-silylated supports. The catalysts were characterized by nuclear magnetic resonance, X-ray diffraction, N₂-adsorption/desorption, temperature programmed reduction, diffuse reflectance spectroscopy in the ultraviolet visible region and high resolution transmission electron microscope. The characterization analyses showed the silylation treatment cause disorganization and partial blockage in the structure of MCM-41 support. Consequently, it were observed less CO overall conversion and selectivity towards C₅₊ hydrocarbons compared with the FTS catalyst prepared with non-silylated support. Also, according to the results of the catalytic evaluation, CO overall conversion seems to be related to the accessibility of the reactants, whereas log-chain hydrocarbons selectivity relates to the ability to reinsert olefins, in conjunction with metal particle size, which is directly connected with metal-support interaction. Keywords Fischer–Tropsch Cobalt species Mesoporous silica Silylation CO hydrogenation C₅₊ hydrocarbons