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Catalysis of the acetylene hydrochlorination reaction by Si-doped Au clusters: a DFT study

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Abstract

The mechanisms for the acetylene hydrochlorination reaction on pristine Au7 and Au8 clusters and on the Si-doped Au clusters Au6Si and Au7Si were systematically investigated via density functional theory using the PBE functional. The band gap (∆Eg) of the Au7Si cluster was found to smaller than that of its undoped equivalent (Au8), thus enhancing its catalytic activity, and Au7Si presented a significantly reduced activation barrier (16.69 kcal mol−1) for the acetylene hydrochlorination reaction compared with the pristine Au8 cluster (21.83 kcal mol−1). On the other hand, the activation barrier for the acetylene hydrochlorination reaction was not lower for the Au6Si cluster than for the pristine Au7 cluster because the band gap (∆Eg) of Au6Si was found to be larger than that of Au7. Hence, the current work shows that the catalytic activities of gold clusters can be systematically modified by doping them. Our findings also suggest how to enhance the acetylene hydrochlorination reaction by doping foreign atoms into Au clusters.

The Si-doped Au7Si cluster showed stronger catalytic activity for the acetylene hydrochlorination reaction compared with the pristine Au8 cluster.

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Acknowledgements

We gratefully acknowledge the funding provided by the Science and Technology Fund Projects of Shihezi University (no. 2014ZRKXJQ03).

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Authors and Affiliations

  1. School of Chemistry and Chemical Engineering of Shihezi University, Shihezi, Xinjiang, 832000, China

    Yu Zhao, Fei Zhao & Lihua Kang

  2. Key Laboratory for Green Processing of Chemical Engineering of Xinjiang Bingtuan, Shihezi, Xinjiang, 832000, China

    Lihua Kang

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  1. Yu Zhao
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  2. Fei Zhao
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  3. Lihua Kang
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Correspondence to Lihua Kang.

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Zhao, Y., Zhao, F. & Kang, L. Catalysis of the acetylene hydrochlorination reaction by Si-doped Au clusters: a DFT study. J Mol Model 24, 61 (2018). https://doi.org/10.1007/s00894-018-3602-2

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