CO气相催化偶联合成草酸二甲酯的原位红外及动力学研究

文章研究了在常压下,CO在钯催化剂上与亚硝酸甲酯气相催化偶联制草酸二甲酯的反应动力学。为了消除催化剂床层中的浓度梯度和温度梯度,较好地揭示反应的本征动力学规律,动力学的考察在无梯度反应器中进行。根据原位红外实验结果分析提出反应机理模型和实验测得的CO转化率与温度,空速,原料配比的关系,对模型进行拟合优化,导出了动力学方程。结果表明,CO的吸附为整个反应的控制步骤。

IR Study and Kinetic Research on CO Catalytic Coupling to Dimethyl Oxalate

In this paper,the kinetic of the CO coupling to dimethyl oxalate on supported palladium catalyst under atmospheric pressure was studied.To diminish the difference of reactants concentration and temperature in reactor and reveal the intrinsic kinetic of the reaction properly,the gradientless reactor was used.Based on the proposed reaction mechanism resulted by in situ FTIR and experimental data on the influence of temperature,space velocity and ration of reactants on CO conversion,the final kinetic equation was deduced.The results showed that the model with the CO adsorption as the rate determine step was perfect.