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X-ray spectroscopic and scattering methods applied to the characterisation of cobalt-based Fischer-Tropsch synthesis catalysts

Herbert, JJ; Senecal, P; Martin, DJ; Bras, W; Beaumont, SK; Beale, AM; (2016) X-ray spectroscopic and scattering methods applied to the characterisation of cobalt-based Fischer-Tropsch synthesis catalysts. Catalysis Science & Technology , 6 (15) pp. 5773-5791. 10.1039/c6cy00581k. Green open access

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Abstract

This review aims to critically assess the use of X-ray techniques, both of a scattering (e.g. X-ray diffraction (XRD), pair distribution function (PDF)) and spectroscopic nature (X-ray absorption spectroscopy (XAFS)), in the study of cobalt-based Fisher–Tropsch Synthesis (FTS) catalysts. In particular, the review will focus on how these techniques have been successfully used to describe the salient characteristics of these catalysts that govern subsequent activity and selectivity, as well as to afford insight into deactivation phenomena that have seemingly stifled their application. We discuss how these X-ray-based techniques have been used to yield insight into the bulk structure, the catalyst surface, oxidation states, local (cobalt) geometry, and elemental composition of particles, primarily from a 1D perspective but we also highlight how, with recent developments in advanced X-ray characterisation methods, crucial information can now be obtained in 2D and 3D. The examples chosen focus on data acquired in situ/operando, under realistic operating conditions and during activation which often allow for obtaining a more relevant perspective on the changes in catalyst structure that accompany a change in catalyst performance. We conclude with a perspective on some of the challenges that beset the Co-based FTS technology and discuss how X-ray based techniques could be used to solve them.

Type: Article
Title: X-ray spectroscopic and scattering methods applied to the characterisation of cobalt-based Fischer-Tropsch synthesis catalysts
Open access status: An open access version is available from UCL Discovery
DOI: 10.1039/c6cy00581k
Publisher version: http://doi.org/10.1039/c6cy00581k
Language: English
Additional information: Copyright © The Royal Society of Chemistry 2016. All rights reserved.
Keywords: Science & Technology, Physical Sciences, Chemistry, Physical, Chemistry, Analytical Electron-microscopy, Co Nanoparticle Catalysts, Combined In-situ, Particle-size, Absorption-spectroscopy, Photoelectron-spectroscopy, Deactivation Mechanism, Co/al2o3 Catalysts, Molecular-sieves, Reverse Micelle
UCL classification: UCL
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Chemistry
URI: https://discovery.ucl.ac.uk/id/eprint/1508020
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