Reactivation of a supported gold catalyst for acetylene hydrochlorination

Nkosi, B.; Coville, Neil J.; Hutchings, Graham J.

doi:10.1039/c39880000071

Cited by 178 publications

(143 citation statements)

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“…These supported metal chlorides did not include gold and it was on the basis of this correlation that it was predicted that cationic gold would be the best catalyst for this reaction (22), and indeed this was subsequently confirmed (23)(24)(25). The correlation with the standard electrode potential has recently been confirmed (21) for catalysts containing 1 wt% metal (Figure 1) was short lived.…”

Section: Correlation Of Activity With the Standard Electrode Potentialmentioning

confidence: 60%

Nanocrystalline gold catalysts: A reflection on catalyst discovery and the nature of active sites

Hutchings

2009

Gold Bull

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Section: Correlation Of Activity With the Standard Electrode Potentialmentioning

confidence: 60%

Nanocrystalline gold catalysts: A reflection on catalyst discovery and the nature of active sites

Hutchings

2009

Gold Bull

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“…However, in the context of oxidizing metallic Au the concentration of HCl employed here is significantly lower than in other studies, limiting the oxidation potential of the reaction environment and possibly explaining the lack of Au oxidation in the presence of HCl alone. 7,16,24 Yet this consideration does not explain why a significant increase in normalized white line height is observed under a HCl/C 2 H 2 reaction mixture but not with HCl/Ar alone.…”

Section: Acs Catalysismentioning

confidence: 90%

Deactivation of a Single-Site Gold-on-Carbon Acetylene Hydrochlorination Catalyst: An X-ray Absorption and Inelastic Neutron Scattering Study

et al. 2018

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Single-site Au species supported on carbon have been shown to be the active sites for acetylene hydrochlorination. The evolution of these single-site species has been monitored by Au L 3 X-ray absorption spectroscopy (XAS). Alternating between a standard reaction mixture of HCl/C 2 H 2 and the single reactants has provided insights into the reaction mechanism and catalyst deactivation processes. We demonstrate that oxidative addition of HCl across an Au(I) chloride species requires concerted addition with C 2 H 2 , in accordance with both the XAS measurements of Au oxidation state and the reaction kinetics being first order with respect to each reactant. Excess C 2 H 2 changes the Au speciation and results in the formation of oligomeric acetylene species which were detected by inelastic neutron scattering. Catalyst deactivation at extended reaction times can be correlated with the formation of metallic Au particles. These Au(0) species generated during the sequential gas experiments, or after prolonged reaction times, results in the analysis of the normalized near-edge white line intensity becoming an unsuitable guide for identifying the active Au species, affecting the strong correlation between normalized white line height and VCM productivity usually observed in the active catalyst. Thus, a combination of scanning transmission electron continued...

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“…Haruta and coworkers (9,10) found that gold, when deposited as nanoparticles on a support using techniques such as deposition-precipitation and co-precipitation, was very active for CO oxidation at ambient temperature as well as at temperatures as low as -76°C. Whilst Hutchings (11)(12)(13)(14) demonstrated that supported gold chloride was the most effective catalyst for ethyne hydrochlorination.…”

Section: Introductionmentioning

confidence: 99%

A review of the use of gold catalysts in selective hydrogenation reactions Lynsey McEwana

2010

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The field of gold catalysis has been a lively area of research for the past two decades and gold catalysts are now an established 'best choice' for many oxidation reactions. Most well known for its performance in selective and preferential oxidation reactions, gold has more recently found potential in selective hydrogenation reactions. In this work the recent developments using gold and gold-promoted catalysts for selective hydrogenation reactions are reviewed: the use for chemoselective hydrogenation of , -unsaturated aldehydes and, in particular, the excellent selectivity exhibited for the selective partial hydrogenation of alkyne, alkadiene and alkene C 2 -C 6 hydrocarbon streams.

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Reactivation of a supported gold catalyst for acetylene hydrochlorination

Abstract: A novel high activity, carbon supported, gold catalyst for acetylene hydrochlorination which can be successfully reactivated by HCI treatment is reported.

Cited by 178 publications

References 0 publications

Nanocrystalline gold catalysts: A reflection on catalyst discovery and the nature of active sites

Nanocrystalline gold catalysts: A reflection on catalyst discovery and the nature of active sites

Deactivation of a Single-Site Gold-on-Carbon Acetylene Hydrochlorination Catalyst: An X-ray Absorption and Inelastic Neutron Scattering Study

A review of the use of gold catalysts in selective hydrogenation reactions Lynsey McEwana

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