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La, Mn and Zn promoted microporous iron catalysts with high productivity and stability for Fischer–Tropsch synthesis

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Abstract

Fischer–Tropsch synthesis is studied over precipitated Fe catalysts promoted with Mn, Zn and La metals. The results showed that there was a large increase in surface area and pore volume, and a sharp decrease in average pore size upon the addition of promoters. Catalyst productivity and rate of syngas converted as well as hydrocarbon yield increased with addition of promoters to Fe structure during precipitation step. Addition of metal promoters led catalyst samples of microporous structures with relatively high surface areas. This effect probably yielded catalysts with enhanced long-term activity and stability. Samples containing 10 % Zn and 5 % Mn exhibited the highest catalytic activity and stability. Increasing the loading of Zn from 5 to 10 wt% led to a noteworthy increase on yield and productivity as well as rate of syngas converted. The highest productivity was obtained for the sample containing 10 % Zn, highest yield was attained over the sample containing 5 % Mn. The results indicate that the selectivity to C12–C18 range was more pronounced for the catalyst promoted with Mn metal whereas α-olefins and higher molecular weight products were increased with the addition of 5 % Zn over Fe based catalysts. The decrease in temperature from 523 to 493 K resulted in an increase in heavy hydrocarbons and a significant decrease in gaseous and light hydrocarbons for Fe4Si5Mn catalyst.

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Acknowledgments

This work was financially supported by The Scientific and Technological Research Council of Turkey (TÜBİTAK) through the Project TÜBİTAK 1007-108G043 “TRIJEN-Liquid Fuel Production from Coal and Biomass Blends.”

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Authors and Affiliations

  1. Tübitak Marmara Research Center, Energy Institute, 41470, Gebze, Kocaeli, Turkey

    Ömer F. Gül & Özlem Ataç

  2. Mechanical Engineering Department, Nişantaşı University, Sadabad Kampüsü, Hasbahçe Caddesi No: 88, Kağıthane, 34030, Istanbul, Turkey

    Ömer F. Gül

  3. Chemical Engineering Department, Faculty of Engineering, Istanbul University, Avcilar, 34320, Istanbul, Turkey

    İsmail Boz

  4. Department of Chemical Engineering, Faculty of Engineering & Architecture, Beykent University, Ayazağa, 34396, Istanbul, Turkey

    Şeyma Özkara-Aydınoğlu

Authors
  1. Ömer F. Gül
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  2. Özlem Ataç
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  3. İsmail Boz
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  4. Şeyma Özkara-Aydınoğlu
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Correspondence to Şeyma Özkara-Aydınoğlu.

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Gül, Ö.F., Ataç, Ö., Boz, İ. et al. La, Mn and Zn promoted microporous iron catalysts with high productivity and stability for Fischer–Tropsch synthesis. Reac Kinet Mech Cat 117, 147–159 (2016). https://doi.org/10.1007/s11144-015-0932-2

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  • DOI: https://doi.org/10.1007/s11144-015-0932-2

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