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Instruments / Technical Area	Publication Details	Published	Actions
B18-Core EXAFS	Lowering the operating temperature of gold acetylene hydrochlorination catalysts using oxidized carbon supports Samuel Pattisson , Simon R. Dawson , Grazia Malta , Nicholas F. Dummer , Louise R. Smith , Anna Lazaridou , David J. Morgan , Simon J. Freakley , Simon A. Kondrat , Joost J. Smit , Peter Johnston , Graham J. Hutchings Acs Catalysis DOI: 10.1021/acscatal.2c04242 Diamond Proposal Number(s): [15214, 15151] Open Access Show Abstract ▼ Abstract: 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.	Nov 2022
B18-Core EXAFS E01-JEM ARM 200CF	Sulfur promotion in Au/C catalyzed acetylene hydrochlorination Simon R. Dawson , Samuel Pattisson , Grazia Malta , Nicholas F. Dummer , Louise R. Smith , Anna Lazaridou , Christopher S. Allen , Thomas E. Davies , Simon J. Freakley , Simon Kondrat , Christopher J. Kiely , Peter Johnston , Graham J. Hutchings Small DOI: 10.1002/smll.202007221 Diamond Proposal Number(s): [23498, 15214, 15151] Open Access Show Abstract ▼ Abstract: The formation of highly active and stable acetylene hydrochlorination catalysts is of great industrial importance. The successful replacement of the highly toxic mercuric chloride catalyst with gold has led to a flurry of research in this area. One key aspect, which led to the commercialization of the gold catalyst is the use of thiosulphate as a stabilizing ligand. This study investigates the use of a range of sulfur containing compounds as promoters for production of highly active Au/C catalysts. Promotion is observed across a range of metal sulfates, non‐metal sulfates, and sulfuric acid treatments. This observed enhancement can be optimized by careful consideration of either pre‐ or post‐treatments, concentration of dopants used, and modification of washing steps. Pre‐treatment of the carbon support with sulfuric acid (0.76 m) resulted in the most active Au/C in this series with an acetylene conversion of ≈70% at 200 °C.	Feb 2021

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