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Lowering the operating temperature of gold acetylene hydrochlorination catalysts using oxidized carbon supports

Pattisson, Samuel, Dawson, Simon R., Malta, Grazia, Dummer, Nicholas F. ORCID:, Smith, Louise R., Lazaridou, Anna, Morgan, David J. ORCID:, Freakley, Simon J., Kondrat, Simon A., Smit, Joost J., Johnston, Peter and Hutchings, Graham J. ORCID: 2022. Lowering the operating temperature of gold acetylene hydrochlorination catalysts using oxidized carbon supports. ACS Catalysis 12 , 14086–14095. 10.1021/acscatal.2c04242

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The commercialization of gold for acetylene hydrochlorination represents a major scientific landmark. The development of second-generation gold catalysts continues with a focus on derivatives and drop-in replacements with higher activity and stability. Here, we show the influence that the support surface oxygen has on the activity of carbon supported gold catalysts. Variation in the surface oxygen content of carbon is achieved through careful modification of the Hummers chemical oxidation method prior to the deposition of gold. All oxidized carbon-based catalysts resulted in a marked increase in activity at 200 °C when compared to the standard nontreated carbon, with an optimum oxygen content of ca. 18 at % being observed. Increasing oxygen and relative concentration of C–O functionality yields catalysts with light-off temperatures 30–50 °C below the standard catalyst. This understanding opens a promising avenue to produce high activity acetylene hydrochlorination catalysts that can operate at lower temperatures.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Chemistry
Cardiff Catalysis Institute (CCI)
Publisher: American Chemical Society
ISSN: 2155-5435
Funders: Johnson Matthey
Date of First Compliant Deposit: 8 November 2022
Date of Acceptance: 20 October 2022
Last Modified: 11 Oct 2023 18:34

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