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Changes in the surface hydrophobicity degree of a MCM-41 used as iron support: a pathway to improve the activity and the olefins production in the Fischer–Tropsch synthesis

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Abstract

The effect of surface hydrophobicity degree of MCM-41 support on activity and selectivity in Fischer–Tropsch synthesis has been studied. The Fe/MCM-41 catalyst was prepared by impregnation of the mesoporous support with iron. A portion of this product was silylated with hexamethyldisilazane. The samples were characterized by atomic absorption spectroscopy, X ray diffraction at low angles, N2 adsorption at 77 K, Fourier transform infrared spectroscopy and Mössbauer spectroscopy at 25 and 298 K in controlled atmosphere. Catalytic tests were performed simulating industrial operating conditions and showed that the silylated system presents higher activity, lower selectivity toward methane and higher olefin/paraffin ratio. The higher methane production and the lower amount of olefins observed for the non-silylated catalyst indicate that this system has a larger amount of hydrogen on its surface than the silylated one. A detailed discussion about the relationship among surface chemistry, stability, selectivity and the changes in iron species of the catalysts is presented.

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Acknowledgements

The authors acknowledge the financial support for this research provided by Universidad Nacional de Río Negro (PI 40 C-392), Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET PIP 00547), Comisión de Investigaciones Científicas de la Provincia de Buenos Aires (CICPBA) and Universidad Nacional de La Plata. We also wish to thank to Ms Valle Graciela for FTIR measurements and Juan Julio and Martín Ramón for its assistance in electronic devices. The authors are grateful to María Cecilia Moreno, CICPBA translator, for checking the English version.

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Authors and Affiliations

  1. CONICET, Universidad Nacional de Rio Negro, Sede Atlántica, Belgrano 526, 8500, Viedma, Rio Negro, Argentina

    N. A. Fellenz

  2. CINDECA, CONICET, CICPBA, UNLP, Fac. Ciencias Exactas, Calle 47, No. 257, 1900, La Plata, Argentina

    J. F. Bengoa, M. V. Cagnoli & S. G. Marchetti

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  1. N. A. Fellenz
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Correspondence to J. F. Bengoa.

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Fellenz, N.A., Bengoa, J.F., Cagnoli, M.V. et al. Changes in the surface hydrophobicity degree of a MCM-41 used as iron support: a pathway to improve the activity and the olefins production in the Fischer–Tropsch synthesis. J Porous Mater 24, 1025–1036 (2017). https://doi.org/10.1007/s10934-016-0342-5

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