Combined quantitative FTIR and online GC study of Fischer-Tropsch catalysts

Andrew I. McNab; Alan J. McCue; Davide Dionisi; James A. Anderson

doi:10.1016/j.jcat.2017.07.028

Combined quantitative FTIR and online GC study of Fischer-Tropsch catalysts

Andrew I. McNab, Alan J. McCue, Davide Dionisi, James A. Anderson^*

^*Corresponding author for this work

Chemical and Materials Engineering Group

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

4 Citations (Scopus)

10 Downloads (Pure)

Abstract

A method for the quantification of the chain length of surface hydrocarbon species on Fischer-Tropsch catalysts by in-situ FTIR was combined with online gas chromatography in order to investigate any potential relationship between adsorbed hydrocarbons species and those detected as reaction products. By varying the reaction conditions and the active metal, changes to the chain lengths of surface species and the product distribution were monitored. Results show that the species observed spectroscopically are predominantly adsorbed reaction products which do not directly relate to the detected reaction products. Hydrocarbon species which can be transported to the support material (γ-alumina) may be ascribed to oxygenated products which are not produced in detectable amounts by GC at low conversion but are selectively adsorbed from the gas phase.

Original language	English
Pages (from-to)	295-304
Number of pages	10
Journal	Journal of Catalysis
Volume	353
Early online date	17 Aug 2017
DOIs	https://doi.org/10.1016/j.jcat.2017.07.028
Publication status	Published - Sept 2017

Bibliographical note

Acknowledgements
We thank the College of physical sciences, university of Aberdeen for a studentship (to A. McNab).

Supplementary data associated with this article can be found, in
the online version, at http://dx.doi.org/10.1016/j.jcat.2017.07.028.

Keywords

Adsorbed alkyl species
Cobalt catalyst
Fischer Tropsch
FTIR
Quantitative FTIR

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Cite this

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title = "Combined quantitative FTIR and online GC study of Fischer-Tropsch catalysts",

abstract = "A method for the quantification of the chain length of surface hydrocarbon species on Fischer-Tropsch catalysts by in-situ FTIR was combined with online gas chromatography in order to investigate any potential relationship between adsorbed hydrocarbons species and those detected as reaction products. By varying the reaction conditions and the active metal, changes to the chain lengths of surface species and the product distribution were monitored. Results show that the species observed spectroscopically are predominantly adsorbed reaction products which do not directly relate to the detected reaction products. Hydrocarbon species which can be transported to the support material (γ-alumina) may be ascribed to oxygenated products which are not produced in detectable amounts by GC at low conversion but are selectively adsorbed from the gas phase.",

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author = "McNab, {Andrew I.} and McCue, {Alan J.} and Davide Dionisi and Anderson, {James A.}",

note = "Acknowledgements We thank the College of physical sciences, university of Aberdeen for a studentship (to A. McNab). Supplementary data associated with this article can be found, in the online version, at http://dx.doi.org/10.1016/j.jcat.2017.07.028.",

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AU - McNab, Andrew I.

AU - McCue, Alan J.

AU - Dionisi, Davide

AU - Anderson, James A.

N1 - Acknowledgements We thank the College of physical sciences, university of Aberdeen for a studentship (to A. McNab). Supplementary data associated with this article can be found, in the online version, at http://dx.doi.org/10.1016/j.jcat.2017.07.028.

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AB - A method for the quantification of the chain length of surface hydrocarbon species on Fischer-Tropsch catalysts by in-situ FTIR was combined with online gas chromatography in order to investigate any potential relationship between adsorbed hydrocarbons species and those detected as reaction products. By varying the reaction conditions and the active metal, changes to the chain lengths of surface species and the product distribution were monitored. Results show that the species observed spectroscopically are predominantly adsorbed reaction products which do not directly relate to the detected reaction products. Hydrocarbon species which can be transported to the support material (γ-alumina) may be ascribed to oxygenated products which are not produced in detectable amounts by GC at low conversion but are selectively adsorbed from the gas phase.

KW - Adsorbed alkyl species

KW - Cobalt catalyst

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KW - Quantitative FTIR

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Combined quantitative FTIR and online GC study of Fischer-Tropsch catalysts

Abstract

Bibliographical note

Keywords

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