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A perspective on counting catalytic active sites and rates of reaction using x-ray spectroscopy

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journal contribution
posted on 09.11.2018 by Simon Kondrat, J.A. van Bokhoven
Identification of active sites and phases in heterogeneous catalysts and the understanding of the reaction mechanism remain highly challenging. In most catalysts, the existence of a multitude of surface species, which are dynamic in relation to reaction conditions, presents a challenge of distinguishing those that are involved in the catalytic cycle from those which are spectators. The emergence of the field of single-site catalysts potentially eliminates these issues, although it can be argued that these systems remain dynamic and that multiple speciation, each a candidate for the active site, often remains a consideration. A perspective on how X-ray spectroscopy and characterization tools in general, can be used to correlate the number of active sites and the rate of their formation, in single-site and redox catalyst systems, is presented. The importance of observing proportionality between spectra features and the reaction rate, to differentiate between active sites and spectator species is discussed. Performing characterisation under catalyticly relevant conditions on structures that are demonstrably representative of actual catalysts is essential.

History

School

  • Science

Department

  • Chemistry

Published in

Topics in Catalysis

Volume

62

Pages

1218 - 1227

Citation

KONDRAT, S.A. and VAN BOKHOVEN, J.A., 2018. A perspective on counting catalytic active sites and rates of reaction using x-ray spectroscopy. Topics in Catalysis, 62, pp.1218-1227.

Publisher

Springer Verlag © The Author(s)

Version

VoR (Version of Record)

Publisher statement

This work is made available according to the conditions of the Creative Commons Attribution 4.0 International (CC BY 4.0) licence. Full details of this licence are available at: http://creativecommons.org/licenses/ by/4.0/

Acceptance date

01/10/2018

Publication date

2018-10-13

Notes

This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.

ISSN

1572-9028

Language

en

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