高等学校化学学报 ›› 1997, Vol. 18 ›› Issue (5): 777.

• 论文 • 上一篇    下一篇

CO和CH3ONO在Al2O3负载钯铜合金催化剂上合成草酸二甲酯的原位红外光谱研究

梁贤振1, 赵维君1, 杨瑞华1, 冯鸣华1, 王忠文1, 马新宾2, 徐根慧2   

  1. 1. 南开大学化学系, 天津, 300071;
    2. 天津大学一碳化工国家重点实验室, 天津, 300072
  • 收稿日期:1996-05-06 出版日期:1997-05-24 发布日期:1997-05-24
  • 通讯作者: 赵维君
  • 作者简介:梁振贤, 男, 30岁, 博士研究生.
  • 基金资助:

    天津大学一碳化工国家重点实验室资助

In situ Infrared Studies of the Catalytical Synthesis of Dimethyl Oxalate from CO and CH3ONO Over Al2O3 Supported Pd-Cu Alloy Catalysts

LIANG Xian-Zhen1, ZHAO Wei-Jun1, YANG Rui-Hua1, FENG Ming-Hua1, WANG Zhong-Wen1, MA Xin-Bin2, XU Gen-Hui2   

  1. 1. Department of Chemistry, Nankai University, Tianjin, 300071;
    2. National None Carbon Chemistry and Engineering Key Laboratory, Tianjin University, Tianjin, 300072
  • Received:1996-05-06 Online:1997-05-24 Published:1997-05-24

摘要: 利用原位红外光谱技术研究了常压下CO和CH3ONO多相催化合成草酸二甲酯的反应.发现在草酸二甲酯生成的同时还存在副反应,副产物NO继续与CO反应生成CO2和N2O.铜在合金催化剂中起辅助作用,铜分散把,使CO桥式吸附减少,线式吸附增多.主反应与CO桥式吸附无关,而副反应却依赖于CO的桥式吸附.CO线式吸附具有更高的反应活性.

关键词: 草酸二甲酯, 一氧化碳, 原位红外光谱, 多相催化

Abstract: The catalytical synthesis of dimethyl oxalate from COand CH3ONOat normal pressure was investigated with in situ IRtechnique.We discovered that there was a subsidiary reaction during the formation of dimethyl oxaIate.The by-product NOcontinued to react with COto produce CO2 and N2O.Palladium was dispersed by copper in the alloy Pd Cu catalysts and consequently results in the increase of the linearly bound COspecies and the decrease of the multiply coordinated COspecies.The main reaction has no relation with the multiply coordinated COspecies but the subsidiary reaction firmly depends on them.The linearly bound COof 2058 cm-1 are more active in the production of dimethyl oxalate.The possible mechanism was also discussed.

Key words: Dimethyl oxalate, Carbon monoxide, In situ IR spectra, Heterogenous catalysis

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