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<p>Active Au species are fundamental issues in Au-catalyzed acetylene hydrochlorination (AH). As classical AH catalyst is prepared by impregnation with HAuCl<sub>4</sub> <i>aqua regia</i> solution, various AuCl<sub>x</sub> species are frequently regarded as the active Au species. Here, we reveal that “Au-Cl bond” free Au is highly active. It even shows noticeable room-temperature activity that fully vanishes when just a small fraction of Au binds to Cl. The mechanism is also well elucidated by combining experimental and elaborate theoretical studies. The gained knowledge can help to develop efficient catalysts or mild process, e.g., lowering process or light-off temperature to inhibit hotspots in reactor, catalyst sintering, or equipment corrosion by the corrosive reactant HCl. This is vital to industrial application, as AH is a strongly exothermic reaction; however, usually ≥180 °C is required owing to the inactivity of catalysts below ~180 °C.</p><p></p>

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Gold chlorides markedly poison gold catalysis for acetylene hydrochlorination

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年5月18日

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  • Zewei Dou,
  • Huajiang Sun,
  • Tao Zhang,
  • Enqi Sun,
  • Yang Dong,
  • Tianbo Fan,
  • Hongfan Guo

摘要

Active Au species are fundamental issues in Au-catalyzed acetylene hydrochlorination (AH). As classical AH catalyst is prepared by impregnation with HAuCl4 aqua regia solution, various AuClx species are frequently regarded as the active Au species. Here, we reveal that “Au-Cl bond” free Au is highly active. It even shows noticeable room-temperature activity that fully vanishes when just a small fraction of Au binds to Cl. The mechanism is also well elucidated by combining experimental and elaborate theoretical studies. The gained knowledge can help to develop efficient catalysts or mild process, e.g., lowering process or light-off temperature to inhibit hotspots in reactor, catalyst sintering, or equipment corrosion by the corrosive reactant HCl. This is vital to industrial application, as AH is a strongly exothermic reaction; however, usually ≥180 °C is required owing to the inactivity of catalysts below ~180 °C.