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An ultra-high H2S-resistant gold-based imidazolium ionic liquid catalyst for acetylene hydrochlorination.
- Source :
-
New Journal of Chemistry . 8/28/2019, Vol. 43 Issue 32, p12767-12775. 9p. - Publication Year :
- 2019
-
Abstract
- 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 °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. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 11440546
- Volume :
- 43
- Issue :
- 32
- Database :
- Academic Search Index
- Journal :
- New Journal of Chemistry
- Publication Type :
- Academic Journal
- Accession number :
- 138100995
- Full Text :
- https://doi.org/10.1039/c9nj01205b