On the Superior Activity and Selectivity of PtCo/Nb2O5 Fischer-Tropsch Catalysts
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Publication date
2016
Authors
den Otter, J.H.
Yoshida, Hideto
Ledesma, C.
Chen, DUSHEN
de Jong, K.P.
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Document Type
Article
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taverne
Abstract
In this study Co/Nb2O5 catalysts and the effect of Pt-promotion thereon are investigated in comparison with γ-Al2O3- and α-Al2O3-supported catalysts for the Fischer-Tropsch (FT) synthesis. Upon Pt-promotion of Co/Nb2O5 the cobalt-weight normalized FT activity was found to increase by a factor of 2.4, while the high C5+ selectivity of 85 wt% was maintained. Based on environmental TEM results no indications were found that Pt affected the cobalt particle size in Co/Nb2O5 catalysts. A kinetic study indicates an increased number of active sites upon Pt-promotion whereas Steady-State Isotopic Transient Kinetic Analysis experiments show that a combination of an increased number of active sites and an increased turnover frequency is at the origin of the enhanced activity in Co/Nb2O5 catalysts upon Pt-promotion. Pt was tentatively proposed to bring about more efficient promotion of Co by NbOx being present as smaller clusters.
Keywords
Activity Promotion, Fischer-Tropsch, Niobia, Noble Metal, TOF, Taverne
Citation
den Otter, J H, Yoshida, H, Ledesma, C, Chen, D & de Jong, K P 2016, 'On the Superior Activity and Selectivity of PtCo/Nb2O5 Fischer-Tropsch Catalysts', Journal of Catalysis, vol. 340, pp. 270-275. https://doi.org/10.1016/j.jcat.2016.05.025