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

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Abstract

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.

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Acknowledgments

The authors are grateful to Coordination for the Improvement of Higher Education Personnel (CAPES/Brazil), National Council of Scientific and Technological Development (CNPq/Brazil) for financial support and The Brazilian Nanotechnology National Laboratory (LNNano) for HRTEM analyses.

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Authors and Affiliations

  1. Chemical Engineering Department, State University of Maringá, Av. Colombo 5790, Maringá, PR, 87020-900, Brazil

    Andréia Soares Zola, Lidiane Sabino da Silva, Artur Lemes Moretti & Pedro Augusto Arroyo

  2. PETROBRAS S.A. CENPES R&D Centre, Cidade Universitária, Av. Horácio Macedo, 950, Cidade Universitária, Rio de Janeiro, RJ, 21.941-915, Brazil

    Adriano do Couto Fraga & Eduardo Falabella Sousa-Aguiar

  3. Department of Organic Processes, School of Chemistry, UFRJ – CT, Bloco E, Cidade Universitária, Ilha do Fundão, Rio de Janeiro, RJ, 21941-909, Brazil

    Eduardo Falabella Sousa-Aguiar

Authors
  1. Andréia Soares Zola
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  2. Lidiane Sabino da Silva
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  3. Artur Lemes Moretti
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Correspondence to Pedro Augusto Arroyo.

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Zola, A.S., da Silva, L.S., Moretti, A.L. et al. Effect of Silylation and Support Porosity of Co/MCM-41 and Co/SiO2 Catalysts in Fischer–Tropsch Synthesis. Top Catal 59, 219–229 (2016). https://doi.org/10.1007/s11244-015-0446-1

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  • DOI: https://doi.org/10.1007/s11244-015-0446-1

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