Co/SiO2 catalysts for Fischer–Tropsch synthesis; effect of Co loading and support modification by TiO2

[Display omitted] ► Co3O4 crystallite sizes do not depend on the cobalt loading. ► Co3O4 particle sizes are smaller in the presence of grafted TiO2 over SiO2. ► Reducibility of cobalt oxides is hindered in the presence of TiO2 over SiO2. ► The catalytic performance of cobalt catalyst in FT reaction...

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Bibliographic Details
Published in:Catalysis today 2012-12, Vol.197 (1), p.18-23
Main Authors: Venezia, Anna Maria, La Parola, Valeria, Liotta, Leonarda F., Pantaleo, Giuseppe, Lualdi, Matteo, Boutonnet, Magali, Järås, Sven
Format: Article
Language:English
Subjects:
Catalysis
Chemistry
Cobalt catalyst
Colloidal gels. Colloidal sols
Colloidal state and disperse state
Exact sciences and technology
Fischer-Tropsch
General and physical chemistry
SiO2 support
Surface physical chemistry
Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry
TiO2 grafting
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Summary:[Display omitted] ► Co3O4 crystallite sizes do not depend on the cobalt loading. ► Co3O4 particle sizes are smaller in the presence of grafted TiO2 over SiO2. ► Reducibility of cobalt oxides is hindered in the presence of TiO2 over SiO2. ► The catalytic performance of cobalt catalyst in FT reaction is improved by the presence of TiO2. The influence of cobalt loading and titania addition to the silica support on Fischer–Tropsch synthesis activity is investigated over two series of catalysts with Co loading of 6wt% and 12wt%. The pure silica support is prepared by sol–gel procedure in acid conditions. The modification by TiO2 is performed by grafting with titanium isopropoxide. The catalysts are prepared by wet-impregnation over amorphous SiO2 and over SiO2 modified by TiO2 (5wt%). The samples, characterized by N2-adsorption–desorption analyses, X-ray diffraction (XRD), temperature programmed reduction (TPR) and X-ray photoelectron spectroscopy (XPS), are tested in the low-temperature Fischer–Tropsch synthesis using the conditions of 483K, 20bar and H2/CO=2.1. The improved conversion rate and the increased SC5+ of the titania containing catalysts are discussed in terms of the stronger interaction between cobalt and titania affecting the cobalt oxide reducibility.
ISSN:0920-5861
1873-4308
1873-4308
DOI:10.1016/j.cattod.2012.05.042