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Identification of single-site gold catalysis in acetylene hydrochlorination

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posted on 30.05.2018 by Grazia Malta, Simon Kondrat, Simon J. Freakley, Catherine J. Davies, Li Lu, Simon R. Dawson, Adam Thetford, Emma K. Gibson, David J. Morgan, Wilm Jones, Peter P. Wells, Peter Johnston, C. Richard A. Catlow, Christopher J. Kiely, Graham J. Hutchings
There remains considerable debate over the active form of gold under operating conditions of a recently validated gold catalyst for acetylene hydrochlorination.We have performed an in situ x-ray absorption fine structure study of gold/carbon (Au/C) catalysts under acetylene hydrochlorination reaction conditions and show that highly active catalysts comprise single-site cationic Au entities whose activity correlates with the ratio of Au(I):Au(III) present. We demonstrate that these Au/C catalysts are supported analogs of single-site homogeneous Au catalysts and propose a mechanism, supported by computational modeling, based on a redox couple of Au(I)-Au(III) species.

Funding

We acknowledge Cardiff University for support as part of the MAXNET Energy Consortium. We also thank R. Schloegl for helpful discussions. UK Catalysis Hub is thanked for resources and support provided through our membership of the UK Catalysis Hub Consortium and funded by the Engineering and Physical Sciences Research Council (EPSRC) (grants EP/K014706/1, EP/K014668/1, EP/K014854/1EP/K014714/1, and EP/M013219/1). We used the B18 beamline at the Diamond Light Source (allocation numbers SP10306, SP11398, and SP15214) with the help of D. Gianolio and G. Cibin. C.J.K. acknowledges funding from the National Science Foundation Major Research Instrumentation program (GR no. MRI/DMR-1040229). We thank Johnson Matthey for their contribution to and funding of this work. Calculations were performed through our membership of the UK’s High-End Computing (HEC) Materials Chemistry Consortium, which is funded by EPSRC (EP/L000202); this work used the Advanced Research Computing High-End Resource (ARCHER) UK National Supercomputing Service (www.archer.ac.uk). Local high performance computing (HPC) services at University College London (UCL) were used on the Grace computer.

History

School

  • Science

Department

  • Chemistry

Published in

Science

Volume

355

Issue

6332

Citation

MALTA, G. ... et al, 2017. Identification of single-site gold catalysis in acetylene hydrochlorination. Science, 355 (6332), pp. 1399-1403.

Publisher

American Association for the Advancement of Science © The Authors

Version

AM (Accepted Manuscript)

Publisher statement

This work is made available according to the conditions of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0) licence. Full details of this licence are available at: https://creativecommons.org/licenses/by-nc-nd/4.0/

Acceptance date

07/03/2017

Publication date

2017-03-31

Notes

This is the author’s version of the work. It is posted here by permission of the AAAS for personal use, not for redistribution. The definitive version was published in Science on 31 March 2017, 355, https://doi.org/10.1126/science.aal3439.

ISSN

0036-8075

eISSN

1095-9203

Language

en

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