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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
chemical engineering
Hydrochlorination of acetylene using carbon-supported gold catalysts: A study of catalyst reactivation
Journal of Catalysis, Volume 128, No. 2, Year 1991
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Description
A study of the reactivation of carbon-supported gold catalysts (Au/C) for the acetylene hydrochlorination reaction is described. Au/C catalysts are deactivated by two competing mechanisms: (i) deposition of carbonaceous material, predominantly at low temperature (60-100°C), and (ii) reduction of Au(III), and possibly Au(I), to Au(0), which occures mainly at higher temperatures (120-180°C). A range of gases have been found to be effective for catalyst reactivation. Air is shown to be effective only for removal of carbonaceous deposits and has no marked effect on the gold oxidation state. However, Cl2 is shown to be effective in oxidising Au(0) and only short reactivation (1 h at 100°C) is required to restore complete catalytic activity. In addition to Cl2, NO and N2O have also been found to be effective and these oxidants can be used during the acetylene hydrochlorination reaction as coreactants to decrease the observed rate of catalyst deactivation. Initial experiments concerning optimisation of the Au/C catalyst are described and the overall experimental data presented suggest that a redox mechanism operates for the formation of vinyl chloride using Au/C catalysts. © 1991.
Authors & Co-Authors
Nkosi, Bongani S.
South Africa, Johannesburg
University of the Witwatersrand
Adams, Mike D.
South Africa, Randburg
Mintek
Coville, Neil John
South Africa, Johannesburg
University of the Witwatersrand
Hutchings, Graham John
United Kingdom, Liverpool
University of Liverpool
Statistics
Citations: 195
Authors: 4
Affiliations: 3
Identifiers
Doi:
10.1016/0021-9517(91)90296-G
ISSN:
00219517
e-ISSN:
10902694
Research Areas
Environmental