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Effect of Mg/Al Ratio on Catalytic Behavior of Fischer–Tropsch Cobalt-Based Catalysts Obtained from Hydrotalcites Precursors

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Abstract

Layered double hydroxides of the hydrotalcite (HT)-type materials have been considered as promising supports for Co-based Fischer–Tropsch synthesis (FTS) catalysts. In this work the effect of the Mg/Al ratio on the catalytic behavior of cobalt-based catalysts obtained from HTs precursors have been studied. Cobalt supported on Mg–Al oxides obtained from HTs Mg–Al precursors were prepared by wet impregnation method and calcined at 300 °C. The textural, structural and reducibility properties of the samples were characterized using different techniques. FTS was evaluated in a down-flow fixed-bed reactor at 20 bar, 250 °C and H2/CO ≈ 2 molar ratio. All catalysts were active and stable during 72 h testing time. The stability was improved by the presence of magnesium in the alumina support; however the CO conversion was negatively affected by increasing the Mg/Al ratio. The reducibility of cobalt decreased as the Mg/Al ratio increased, probably due to the strong Co–O–Mg interaction as evidenced by the formation of CoxOy–MgO mixed oxide. Furthermore, the activity of the catalysts was correlated with the H2-chemisorption measurements. The results suggest that HTs as Co-based catalysts were highly stable in FTS.

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Acknowledgments

The authors are grateful to Colciencias for financing the Project 1115-521-28804. To Universidad de Antioquia for the financial support through Programa Sostenibilidad 2014–2015. Angélica Forgionny wishes to thank to Colciencias for her Ph.D. scholarship.

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Authors and Affiliations

  1. Química de Recursos Energéticos y Medio Ambiente, Instituto de Química, Facultad de Ciencias Exactas y Naturales, Universidad de Antioquia, UdeA - Colombia, Calle 70 No. 52 - 21, Medellín, Colombia

    Angélica Forgionny, Fanor Mondragón & Andrés Moreno

  2. Grupo de Energía y Química Sostenibles (EQS), Instituto de Catálisis y Petroleoquímica-CSIC, Marie Curie 2, 28049, Madrid, Spain

    J. L. G. Fierro

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  1. Angélica Forgionny
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Correspondence to Andrés Moreno.

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Forgionny, A., Fierro, J.L.G., Mondragón, F. et al. Effect of Mg/Al Ratio on Catalytic Behavior of Fischer–Tropsch Cobalt-Based Catalysts Obtained from Hydrotalcites Precursors. Top Catal 59, 230–240 (2016). https://doi.org/10.1007/s11244-015-0430-9

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