On the Superior Activity and Selectivity of PtCo/Nb2O5 Fischer-Tropsch Catalysts

J. H. den Otter; H. Yoshida; C. Ledesma; D. Chen; K. P. de Jong

doi:10.1016/j.jcat.2016.05.025

On the Superior Activity and Selectivity of PtCo/Nb2O5 Fischer-Tropsch Catalysts

J. H. den Otter, H. Yoshida, C. Ledesma, D. Chen, K. P. de Jong

Sub Inorganic Chemistry and Catalysis

Research output: Contribution to journal › Article › Academic › peer-review

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.

Original language	English
Pages (from-to)	270-275
Number of pages	6
Journal	Journal of Catalysis
Volume	340
DOIs	https://doi.org/10.1016/j.jcat.2016.05.025
Publication status	Published - 2016

Keywords

Activity Promotion
Fischer-Tropsch
Niobia
Noble Metal
TOF

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@article{ed70af49786644b3a96b51c13c391af4,

title = "On the Superior Activity and Selectivity of PtCo/Nb2O5 Fischer-Tropsch Catalysts",

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",

author = "{den Otter}, {J. H.} and H. Yoshida and C. Ledesma and D. Chen and {de Jong}, {K. P.}",

year = "2016",

doi = "10.1016/j.jcat.2016.05.025",

language = "English",

volume = "340",

pages = "270--275",

journal = "Journal of Catalysis",

issn = "0021-9517",

publisher = "Academic Press Inc.",

}

TY - JOUR

T1 - On the Superior Activity and Selectivity of PtCo/Nb2O5 Fischer-Tropsch Catalysts

AU - den Otter, J. H.

AU - Yoshida, H.

AU - Ledesma, C.

AU - Chen, D.

AU - de Jong, K. P.

PY - 2016

Y1 - 2016

N2 - 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.

AB - 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.

KW - Activity Promotion

KW - Fischer-Tropsch

KW - Niobia

KW - Noble Metal

KW - TOF

U2 - 10.1016/j.jcat.2016.05.025

DO - 10.1016/j.jcat.2016.05.025

M3 - Article

SN - 0021-9517

VL - 340

SP - 270

EP - 275

JO - Journal of Catalysis

JF - Journal of Catalysis

ER -

On the Superior Activity and Selectivity of PtCo/Nb2O5 Fischer-Tropsch Catalysts

Abstract

Keywords

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