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实验研究了在氢气存在下 ,一氧化碳与亚硝酸乙酯偶联合成草酸二乙酯反应体系在典型操作条件下的化学反应和反应性能 ,结果表明氢气只与反应体系中的亚硝酸乙酯反应生成乙醇。由于氢气与一氧化碳在催化剂表面竞争吸附 ,并且氢的存在打破了生成草酸二乙酯所必需的正常的氧化还原过程 :Pd0 →Pd2 + →Pd0 ,因此氢的引入使一氧化碳转化率及草酸二乙酯选择性下降。此外 ,化学吸附测试结果表明氢气和一氧化碳是在催化剂表面同一活性中心上吸附。
The chemical reaction and the reaction performance of diethyl oxalate in the presence of hydrogen under coupling reaction of carbon monoxide and ethyl nitrite were investigated under typical operating conditions. The results showed that hydrogen reacted only with ethyl nitrite in the reaction system Ethanol. Since hydrogen and carbon monoxide compete for adsorption on the surface of the catalyst, and the presence of hydrogen breaks the normal redox process necessary for the formation of diethyl oxalate: Pd0 → Pd2 + → Pd0, introduction of hydrogen leads to carbon monoxide conversion and diethyl oxalate Selective decline. In addition, chemisorption test results show that hydrogen and carbon monoxide are adsorbed on the same active site on the catalyst surface.