文献类型：期刊文献

英文题名：The mechanism of CO coupling reaction to form dimethyl oxalate over Pd/α-Al2O3

作者：Ji, Yang[1]; Liu, Gang[1]; Li, Wei[1]; Xiao, Wende[1]

机构：[1] State Key Laboratory of Chemical Engineering, East China University of Science and Technology, Shanghai, 200237, China

年份：2009

卷号：314

期号：1-2

起止页码：63

外文期刊名：Journal of Molecular Catalysis A: Chemical

收录：EI(收录号：20095112558659)

语种：英文

外文关键词：Chemical reactions - Oxalic acid - Adsorption - Palladium compounds - Fourier transform infrared spectroscopy

摘要：The purpose of this study is to investigate the mechanism of CO coupling reaction to form dimethyl oxalate (DMO) over Pd/α-Al2O3 by using in situ infrared spectroscopy. The formation of DMO is initiated by methyl nitrite (MN) adsorption and CO adsorption over Pd/α-Al2O3. Two intermediates, ON-Pd-OCH3 and ON-Pd-COOCH3, were identified. The formation of DMO proceeds via coupling two ON-Pd-COOCH3 intermediates. CO adsorption generates linearly bonded CO and bridge bonded CO over Pd/α-Al2O3, but only bridge bonded CO participates in the reaction. Moreover, the ratio of ON-Pd-OCH3 to bridge bonded CO over Pd/α-Al2O3 surface has significant influence on the formations of by-products (methyl formate (MF) and dimethyl carbonate (DMC)). ? 2009 Elsevier B.V. All rights reserved.