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Catalysts 2016, 6(7), 98; doi:10.3390/catal6070098

Influence of Cobalt Precursor on Efficient Production of Commercial Fuels over FTS Co/SiC Catalyst

Chemical Engineering Department, Faculty of Chemical Sciences and Technologies, University of Castilla La Mancha, Avda. Camilo José Cela 12, 13071 Ciudad Real, Spain
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Academic Editor: Michalis Konsolakis
Received: 30 November 2015 / Revised: 6 June 2016 / Accepted: 28 June 2016 / Published: 7 July 2016
(This article belongs to the Special Issue Surface Chemistry and Catalysis)
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Abstract

β-SiC-supported cobalt catalysts have been prepared from nitrate, acetate, chloride and citrate salts to study the dependence of Fischer–Tropsch synthesis (FTS) on the type of precursor. Com/SiC catalysts were synthetized by vacuum-assisted impregnation while N2 adsorption/desorption, XRD, TEM, TPR, O2 pulses and acid/base titrations were used as characterization techniques. FTS catalytic performance was carried out at 220 °C and 250 °C while keeping constant the pressure (20 bar), space velocity (6000 Ncm3/g·h) and syngas composition (H2/CO:2). The nature of cobalt precursor was found to influence basic behavior, extent of reduction and metallic particle size. For β-SiC-supported catalysts, the use of cobalt nitrate resulted in big Co crystallites, an enhanced degree of reduction and higher basicity compared to acetate, chloride and citrate-based catalysts. Consequently, cobalt nitrate provided a better activity and selectivity to C5+ (less than 10% methane was formed), which was centered in kerosene-diesel fraction (α = 0.90). On the contrary, catalyst from cobalt citrate, characterized by the highest viscosity and acidity values, presented a highly dispersed distribution of Co nanoparticles leading to a lower reducibility. Therefore, a lower FTS activity was obtained and chain growth probability was shortened as observed from methane and gasoline-kerosene (α = 0.76) production when using cobalt citrate. View Full-Text
Keywords: Fischer–Tropsch; β-SiC support; cobalt precursors; commercial fuels Fischer–Tropsch; β-SiC support; cobalt precursors; commercial fuels
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

de la Osa, A.R.; Romero, A.; Dorado, F.; Valverde, J.L.; Sánchez, P. Influence of Cobalt Precursor on Efficient Production of Commercial Fuels over FTS Co/SiC Catalyst. Catalysts 2016, 6, 98.

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