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

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 foun...

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Bibliographic Details
Published in:Catalysis science & technology 2013-01, Vol.3 (1), p.128-134
Main Authors: Conte, Marco, Davies, Catherine J., Morgan, David J., Davies, Thomas E., Carley, Albert F., Johnston, Peter, Hutchings, Graham J.
Format: Article
Language:English
Subjects:
Acetylene
Carbon
Catalysis
Catalysts
Gold
Hydrochlorination
Nanostructure
X-ray photoelectron spectroscopy
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Summary: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 Au super(3+) species in the catalyst. However, by preparing catalysts with different Au super(3+) content it was possible to determine the existence of a threshold Au super(3+) amount, beyond which the excess of Au super(3+) 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 Au super(3+) 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.
ISSN:2044-4753
2044-4761
DOI:10.1039/C2CY20478A