Modifications of the metal and support during the deactivation and regeneration of Au/C catalysts for the hydrochlorination of acetylene

Conte, Marco, Davies, Catherine, Morgan, David John ORCID: https://orcid.org/0000-0002-6571-5731, Davies, Thomas E., Carley, Albert Frederick, Johnston, Peter and Hutchings, Graham John ORCID: https://orcid.org/0000-0001-8885-1560 2013. Modifications of the metal and support during the deactivation and regeneration of Au/C catalysts for the hydrochlorination of acetylene. Catalysis Science and Technology 3 (1) , pp. 128-134. 10.1039/C2CY20478A

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Abstract

The effect of the gold oxidation state and carbon structure on the activity of Au/C catalysts for the hydrochlorination of acetylene was investigated by a combined approach using TPR, XPS and porosimetry determinations. The activity of the catalyst in the synthesis of vinyl chloride monomer was found to be dependent on the presence of Au3+ species in the catalyst. However, by preparing catalysts with different Au3+ content it was possible to determine the existence of a threshold Au3+ amount, beyond which the excess of Au3+ was not active for the reaction. This was explained by the existence of active sites at the Au/C interface, and not just by the presence of Au3+ species on top of Au nanoparticles, as explained by current models for these catalysts. It was also possible to determine the existence of a subset of Au nanoclusters which do not take part in the reaction, as well as changes in the textural properties of the carbon that can affect its long term reusability.

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Cardiff Catalysis Institute (CCI) Chemistry
Subjects:	Q Science > QD Chemistry
Publisher:	Royal Society of Chemistry
ISSN:	2044-4753
Funders:	Johnson Matthey, WGC
Date of First Compliant Deposit:	30 March 2016
Last Modified:	14 Nov 2024 08:54
URI:	https://orca.cardiff.ac.uk/id/eprint/51009

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