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    Home > The latest development of high stability Au based catalysts for acetylene hydrochlorination

    The latest development of high stability Au based catalysts for acetylene hydrochlorination

    • Last Update: 2019-04-03
    • Source: Internet
    • Author: User
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    Professor Yuan Youzhu, School of chemistry and chemical engineering, Xiamen University, and Professor Edman Tsang, Wolfson catalytic research center, Department of chemistry, Oxford University have made important progress in the research of high performance Au based catalysts for coal based acetylene hydrochlorination through international cooperation The related results were published in nature communications (DOI: 10.1038 / s41467-019-08827-5) under the title of "self regeneration of Au / CeO 2-based catalysts with enhanced activity and ultra stability for acylene hydrology" Recently, more and more attention has been paid to highly dispersed and stable single metal atom heterogeneous catalysts However, under the actual catalytic reaction conditions, the active species / centers of these catalysts are still easy to aggregate or lose For example, although the ultra-high dispersion Au based catalyst shows excellent performance in many important catalytic reactions, its stability under specific reaction conditions still needs to be improved Catalytic hydrochlorination of acetylene is a key process for the production of vinyl chloride monomer (VCM) in coal rich areas At present, mercuric chloride is still used as catalyst in industrial processes, while the international Minamata convention requires the control and reduction of mercury (Hg) emissions, so it is urgent to develop a practical and effective catalyst to replace mercury based catalyst According to the previous research of Professor Yuan Youzhu's research group and the existing literature, the cyclic transformation of Au (I) / Au (III) active site is considered as the catalytic elementary reaction of acetylene hydrochlorination on the surface of Au based catalyst, but the surface active Au (I) / Au (III) species of Au catalyst is prone to be over reduced to inactive Au (0) and irreversible deactivation It was found for the first time that the crystal surface of CeO 2 (110) can activate Au (0) / Au (I) species back to the cyclic active site with catalytic activity It is found that the inactive Au (0) is not a bystander of the catalytic process of acetylene hydrochlorination, but directly participates in the catalytic cycle of acetylene hydrochlorination The redox pairs of Ce (IV) / Ce (III) on the crystal surface of CeO 2 (110) can provide the electrons needed for the rapid oxidation of Au (0) species to Au (I) active sites, and finally realize the high activity and stability of the Au based catalyst for acetylene hydrochlorination Under the industrial reaction conditions of acetylene hydrochlorination, the life of Au / CeO 2 @ AC catalyst exceeds 3000 H, relevant results have applied for Chinese patent (201610638943.6 and 201711463790.7) The research work was completed under the guidance of Professor Yuan Youzhu and Professor Edman Tsang of Oxford University Postdoctoral Ye Lin and doctoral student Simon Wu (co first author) of Oxford University completed the related in-situ characterization, synchrotron radiation and simulation calculation, etc and Duan Xinping, engineer of National Engineering Laboratory of alcohol ether ester (co first author) completed the catalyst design, preparation, performance test and other work The research work was supported by national key R & D plan (approval No.: 2017yfa0206801), National Natural Science Foundation (approval No.: 21473145, 21503173) and Ministry of education innovation team (IRT R13).
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