Nitrogen-modified activated carbon supported bimetallic gold–cesium(i) as highly active and stable catalyst for the hydrochlorination of acetylene

Author(s): Jia Zhao ¹ ^, ² ^, ³ ^, ⁴ , Tongtong Zhang ¹ ^, ² ^, ³ ^, ⁴ , Xiaoxia Di ¹ ^, ² ^, ³ ^, ⁴ , Jiangtao Xu ¹ ^, ² ^, ³ ^, ⁴ , Jinhui Xu ¹ ^, ² ^, ³ ^, ⁴ , Feng Feng ¹ ^, ² ^, ³ ^, ⁴ , Jun NI ¹ ^, ² ^, ³ ^, ⁴ , Xiaonian Li ¹ ^, ² ^, ³ ^, ⁴

Publication date (Electronic): 2015

Journal: RSC Advances

Publisher: Royal Society of Chemistry (RSC)

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Abstract

In the challenging acetylene hydrochlorination to vinyl chloride over Au-based catalysts, Au–Cs ^I catalysts are substantially more active and stable than their monometallic counterparts.

Abstract

In the challenging acetylene hydrochlorination to vinyl chloride over Au-based catalysts, Au–Cs ^I catalysts are substantially more active and stable than their monometallic counterparts. Here we describe a novel nitrogen-modified activated carbon supported Au–Cs ^I catalyst (1Au4Cs ^I/NAC) that delivers stable performance for acetylene conversion reaching 90.1% and there was only 1.5% C ₂H ₂ conversion loss after 50 h under the reaction conditions of C ₂H ₂ hourly space velocity 1480 h ⁻¹. After a careful characterization of all the catalysts, we concluded that the nitrogen atoms’ influence on the stability of the Au–Cs ^I catalysts correlates with the strengthening of the adsorption of hydrogen chloride to the catalyst and consequently inhibits Au ³⁺ reduction under the reaction conditions.