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采用原位红外技术对甲醇氧化羰基合成碳酸二甲酯反应机理进行了系统的研究 .原位红外实验结果表明 ,氧气在负载的Cu基催化剂上发生解离吸附 ,CO在催化剂表面的吸附为弱吸附 ,氧气与CO在催化剂表面发生共吸附 ,甲醇在催化剂表面吸附后产生甲氧基 ,压力提高有助于甲氧基的生成 .吸附态的甲氧基诱导弱吸附的CO进行插入反应是生成碳酸二甲酯的途径 .同时 ,原位红外技术研究结果表明 ,在碳酸二甲酯合成过程中 ,存在甲氧基与离解的氧进一步作用生成副产物CO2 和H2 O的可能 ,因此 ,应控制原料中O2 的浓度为适宜值
In-situ infrared (IR) technique was used to systematically study the reaction mechanism of methanol oxidation of carbonyl to dimethyl carbonate.The results of in-situ infrared experiments showed that oxygen was dissociatively adsorbed on the supported Cu-based catalyst and the adsorption of CO on the catalyst surface was weak Adsorption, Oxygen and Co co-adsorption on the surface of the catalyst, methanol on the catalyst surface after the formation of methoxy, the pressure increases contribute to the formation of methoxy. Adsorption of methoxy induced weakly adsorbed CO insertion reaction is generated Dimethyl carbonate .At the same time, in-situ infrared technology research results show that in the synthesis of dimethyl carbonate, the presence of oxygen and dissociation of oxygen to further the role of the formation of by-products CO2 and H2O, therefore, should be controlled The concentration of O2 in the feedstock is the appropriate value