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Dehydrochlorination of 1,2-dichloroethane over tetraphenylphosphonium chloride supported carbon catalyst

Abstract

Aiming to explore a promising catalyst with the superior anti-coking property for 1,2-dichloroethane (EDC) dehydrochlorination reaction, we first prepared several activated carbon (AC) supported high melting point quaternary phosphonium salt (QPS/AC) catalysts through the incipient wetness impregnation technique. After comparing the catalytic activity of these QPS/AC catalysts for EDC dehydrochlorination, we selected activated carbon supported tetraphenylphosphonium chloride catalyst (TPPC/AC) as the research object owing to its highest catalytic activity. Activity evaluation results demonstrate the optimum catalyst loading of 15%TPPC exhibits the outstanding catalytic activity (the acetylene conversion of 85.9%) and stability (the deactivation rate of 0.014% h-1). Through characterizations of BET, TG and TPD, it is shown that 15%TPPC/AC can promote the desorption of C2H3Cl and retard the desorption of HCl. This special adsorption and desorption property of 15%TPPC/AC attributes to the excellent anti-coking capacity, which ensures its long-term stability in the EDC dehydrochlorination process. In combination with density functional theory (DFT) calculation, it is indicated that the TPPC can activate the C-H bond of EDC molecule and dramatically reduce the activation energy of the reaction, consequently boosting the process of EDC dehydrochlorination reaction.

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Publication details

The article was received on 24 May 2018, accepted on 12 Oct 2018 and first published on 12 Oct 2018


Article type: Paper
DOI: 10.1039/C8NJ02580K
Citation: New J. Chem., 2018, Accepted Manuscript
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    Dehydrochlorination of 1,2-dichloroethane over tetraphenylphosphonium chloride supported carbon catalyst

    Y. Dong, W. Zhao, Y. Han, J. Zhang, Y. Nian, H. Zhang and W. Li, New J. Chem., 2018, Accepted Manuscript , DOI: 10.1039/C8NJ02580K

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