Journal
NEW JOURNAL OF CHEMISTRY
Volume 43, Issue 32, Pages 12767-12775Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c9nj01205b
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- National Natural Science Foundation of China (NSFC) [21606199, 21476207]
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Enhancement of the sulfur resistance of gold-based catalysts is significantly relevant and highly desirable for the development and large-scale applications of these catalysts. In this study, a supported gold-based imidazolium ionic liquid catalyst was shown to be ultra-high resistant towards sulfur poisoning during the acetylene hydrochlorination reaction. To explore the impact of H2S on the as-prepared catalysts, accelerated laboratory-scale poisoning tests were performed, and characterization was achieved by various instruments. The adsorption of H2S on the active sites of Au/AC catalysts, occupying gold species, prevented the reactants, including C2H2 and HCl, from being adsorbed on the catalyst surface. With respect to the Au-IL/AC catalysts, the unique Au-IL colloid complexes, formed from ionic liquids, impart resistance towards H2S; moreover, the ionic liquid layer on the activated carbon surface can prevent the deposition of sulfur impurities on catalysts; in addition, the adsorption of H2S on the ionic liquid layer is a dynamic equilibrium process, and the adsorption equilibrium constant at 180 degrees C (453 K) is 0.24 L mg(-1). The interaction between H2S and the ions in the ionic liquid is weaker than the binding force within ions in the ionic liquid itself.
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