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Citation: DING Bing-Jing, HUANG Shi-Ping, WANG Wen-Chuan. Dimerization of Ethene Catalyzed by Acidic Zeolites[J]. Acta Physico-Chimica Sinica, ;2007, 23(12): 1864-1868. doi: 10.3866/PKU.WHXB20071207 shu

Dimerization of Ethene Catalyzed by Acidic Zeolites

1.
Key Laboratory for Nanomaterials, Ministry of Education, Beijing University of Chemical Technology, Beijing 100029, P. R. China

Received Date: 9 July 2007
Available Online: 10 October 2007

Density functional theory (DFT) was employed to investigate the dimerization of ethene over acidic zeolites with a 5T cluster model simulating zeolite. At the B3LYP/6-311+G(3df, 2p) level, the activation energy was obtained with a zero point energy (ZPE) correction. It was found that the process of the dimerization of ethene can be divided into three steps: the chemical adsorption of first ethene molecule, the physical adsorption of second ethene molecule and the dimerization reaction. The reaction proceeds by ethene chemical adsorption to form the surface ethoxide and the C—C bond formation between the ethoxide and the second ethene molecule to form the butoxide product. The calculated reaction energy barriers of ethene chemical adsorption and dimerization reaction are 108 and 149 kJ·mol-1, respectively. The obtained activation barrier of β-scission of 1-butene is 217 kJ·mol-1 in the reverse reaction of ethene dimerization.
- DFT; Zeolites; Ethene; Dimerization; Alkoxide
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