High-temperature Fischer-Tropsch synthesis over FeTi mixed oxide model catalysts: Tailoring activity and stability by varying the Ti/Fe ratio

Vera P. Santos; Liam Borges; Sina Sartipi; Bart van der Linden; A. Iulian Dugulan; Adam Chojecki; Thomas Davidian; Matthijs Ruitenbeek; Garry R. Meima; Freek Kapteijn; Michiel Makkee; Jorge Gascon

doi:10.1016/j.apcata.2017.01.002

High-temperature Fischer-Tropsch synthesis over FeTi mixed oxide model catalysts: Tailoring activity and stability by varying the Ti/Fe ratio

Vera P. Santos^*, Liam Borges, Sina Sartipi, Bart van der Linden, A. Iulian Dugulan, Adam Chojecki, Thomas Davidian, Matthijs Ruitenbeek, Garry R. Meima, Freek Kapteijn, Michiel Makkee, Jorge Gascon

^*Corresponding author for this work

Chemical Engineering

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

17 Scopus citations

Abstract

A series of Fe-Ti mixed oxide model catalysts containing different Ti/Fe ratios were synthesized and applied as catalysts for the High Temperature Fischer-Tropsch reaction (HTFTS). XRD, H₂-TPR and in situ Mössbauer and XAFS spectroscopy were applied to evaluate the role of Ti on the physical and chemical properties of Fe within the mixed metal oxide. It was observed that the Ti/Fe ratio determines the relative amounts of hematite, pseudobrookite, and anatase in the starting materials. The interplay between these phases is responsible for the HTFTS catalytic performance. Our results demonstrate that the presence of pseudobrookite: i) enhances the dispersion of iron; ii) mediates and controls the reduction and carburization degree during the transformation of Fe (III) species to carbides upon activation, and iii) increases the stability under HTFTS conditions by minimizing the re-oxidation of iron carbides. Highest catalytic activity and stability is achieved for the material with Ti/Fe ratio of 1/2.1.

Original language	English (US)
Pages (from-to)	38-48
Number of pages	11
Journal	Applied Catalysis A: General
Volume	533
DOIs	https://doi.org/10.1016/j.apcata.2017.01.002
State	Published - 2017

Keywords

Bulk Fe-based catalysts
Carburization
Deactivation
Fischer-Tropsch
Pseudobrookite
Reduction
Ti/Fe ratio

ASJC Scopus subject areas

Catalysis
Process Chemistry and Technology

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10.1016/j.apcata.2017.01.002

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Santos, V. P., Borges, L., Sartipi, S., van der Linden, B., Dugulan, A. I., Chojecki, A., Davidian, T., Ruitenbeek, M., Meima, G. R., Kapteijn, F., Makkee, M., & Gascon, J. (2017). High-temperature Fischer-Tropsch synthesis over FeTi mixed oxide model catalysts: Tailoring activity and stability by varying the Ti/Fe ratio. Applied Catalysis A: General, 533, 38-48. https://doi.org/10.1016/j.apcata.2017.01.002

@article{389fc381499b4586b712a2e819827bff,

title = "High-temperature Fischer-Tropsch synthesis over FeTi mixed oxide model catalysts: Tailoring activity and stability by varying the Ti/Fe ratio",

abstract = "A series of Fe-Ti mixed oxide model catalysts containing different Ti/Fe ratios were synthesized and applied as catalysts for the High Temperature Fischer-Tropsch reaction (HTFTS). XRD, H2-TPR and in situ M{\"o}ssbauer and XAFS spectroscopy were applied to evaluate the role of Ti on the physical and chemical properties of Fe within the mixed metal oxide. It was observed that the Ti/Fe ratio determines the relative amounts of hematite, pseudobrookite, and anatase in the starting materials. The interplay between these phases is responsible for the HTFTS catalytic performance. Our results demonstrate that the presence of pseudobrookite: i) enhances the dispersion of iron; ii) mediates and controls the reduction and carburization degree during the transformation of Fe (III) species to carbides upon activation, and iii) increases the stability under HTFTS conditions by minimizing the re-oxidation of iron carbides. Highest catalytic activity and stability is achieved for the material with Ti/Fe ratio of 1/2.1.",

keywords = "Bulk Fe-based catalysts, Carburization, Deactivation, Fischer-Tropsch, Pseudobrookite, Reduction, Ti/Fe ratio",

author = "Santos, {Vera P.} and Liam Borges and Sina Sartipi and {van der Linden}, Bart and Dugulan, {A. Iulian} and Adam Chojecki and Thomas Davidian and Matthijs Ruitenbeek and Meima, {Garry R.} and Freek Kapteijn and Michiel Makkee and Jorge Gascon",

note = "Publisher Copyright: {\textcopyright} 2017 Elsevier B.V.",

year = "2017",

doi = "10.1016/j.apcata.2017.01.002",

language = "English (US)",

volume = "533",

pages = "38--48",

journal = "Applied Catalysis A: General",

issn = "0926-860X",

publisher = "Elsevier B.V.",

}

Santos, VP, Borges, L, Sartipi, S, van der Linden, B, Dugulan, AI, Chojecki, A, Davidian, T, Ruitenbeek, M, Meima, GR, Kapteijn, F, Makkee, M & Gascon, J 2017, 'High-temperature Fischer-Tropsch synthesis over FeTi mixed oxide model catalysts: Tailoring activity and stability by varying the Ti/Fe ratio', Applied Catalysis A: General, vol. 533, pp. 38-48. https://doi.org/10.1016/j.apcata.2017.01.002

TY - JOUR

T1 - High-temperature Fischer-Tropsch synthesis over FeTi mixed oxide model catalysts

T2 - Tailoring activity and stability by varying the Ti/Fe ratio

AU - Santos, Vera P.

AU - Borges, Liam

AU - Sartipi, Sina

AU - van der Linden, Bart

AU - Dugulan, A. Iulian

AU - Chojecki, Adam

AU - Davidian, Thomas

AU - Ruitenbeek, Matthijs

AU - Meima, Garry R.

AU - Kapteijn, Freek

AU - Makkee, Michiel

AU - Gascon, Jorge

PY - 2017

Y1 - 2017

N2 - A series of Fe-Ti mixed oxide model catalysts containing different Ti/Fe ratios were synthesized and applied as catalysts for the High Temperature Fischer-Tropsch reaction (HTFTS). XRD, H2-TPR and in situ Mössbauer and XAFS spectroscopy were applied to evaluate the role of Ti on the physical and chemical properties of Fe within the mixed metal oxide. It was observed that the Ti/Fe ratio determines the relative amounts of hematite, pseudobrookite, and anatase in the starting materials. The interplay between these phases is responsible for the HTFTS catalytic performance. Our results demonstrate that the presence of pseudobrookite: i) enhances the dispersion of iron; ii) mediates and controls the reduction and carburization degree during the transformation of Fe (III) species to carbides upon activation, and iii) increases the stability under HTFTS conditions by minimizing the re-oxidation of iron carbides. Highest catalytic activity and stability is achieved for the material with Ti/Fe ratio of 1/2.1.

AB - A series of Fe-Ti mixed oxide model catalysts containing different Ti/Fe ratios were synthesized and applied as catalysts for the High Temperature Fischer-Tropsch reaction (HTFTS). XRD, H2-TPR and in situ Mössbauer and XAFS spectroscopy were applied to evaluate the role of Ti on the physical and chemical properties of Fe within the mixed metal oxide. It was observed that the Ti/Fe ratio determines the relative amounts of hematite, pseudobrookite, and anatase in the starting materials. The interplay between these phases is responsible for the HTFTS catalytic performance. Our results demonstrate that the presence of pseudobrookite: i) enhances the dispersion of iron; ii) mediates and controls the reduction and carburization degree during the transformation of Fe (III) species to carbides upon activation, and iii) increases the stability under HTFTS conditions by minimizing the re-oxidation of iron carbides. Highest catalytic activity and stability is achieved for the material with Ti/Fe ratio of 1/2.1.

KW - Bulk Fe-based catalysts

KW - Carburization

KW - Deactivation

KW - Fischer-Tropsch

KW - Pseudobrookite

KW - Reduction

KW - Ti/Fe ratio

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U2 - 10.1016/j.apcata.2017.01.002

DO - 10.1016/j.apcata.2017.01.002

M3 - Article

AN - SCOPUS:85009371739

SN - 0926-860X

VL - 533

SP - 38

EP - 48

JO - Applied Catalysis A: General

JF - Applied Catalysis A: General

ER -

High-temperature Fischer-Tropsch synthesis over FeTi mixed oxide model catalysts: Tailoring activity and stability by varying the Ti/Fe ratio

Abstract

Keywords

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