二氧化碳直接加氢合成二甲醚的本征动力学

 在固定床积分反应器中，在反应温度200～260 ℃、反应压力3.0～4.0 MPa、原料气组成n(H2)/n(CO2)=4.0的条件下，研究了Cu-ZnO-SiO2/HZSM-5复合催化剂上CO2直接加氢合成二甲醚的本征动力学。采用Langmuir-Hinshelwood机理和双活性点反应假设模型，建立了CO2直接加氢合成二甲醚的本征动力学模型，并用Powell方法和定步长龙格-库塔-吉尔方法数值积分相结合来估计模型参数。模型检验结果表明，所得的本征动力学模型与实验数据吻合良好。研究结果可为CO2加氢合成二甲醚过程的放大提供理论依据。

INTRINSIC KINETICS OF DIMETHYL ETHER SYNTHESIS DIRECTLY FROM CO2 HYDROGENATION

The intrinsic kinetic experiments of dimethyl ether (DME) synthesis from CO2 and H2 over Cu-ZnO-SiO2/HZSM-5 catalyst were carried out in a fixed bed integral reactor under the conditions of 200～260℃, 3.0～4.0MPa, and H2/CO2 molar ratio 4.0. Based on the Langmuir-Hinshelwood mechanism and the hypothesis of two-active sites catalytic mechanism, and using Powell optimization method and fixed step Rounge-Kutta-Gill numerical integration method, the intrinsic kinetic models were established, which were consistent with the experimental data of dimethyl ether synthesis from CO2 hydrogenation. The results may provide a reference for the scaling-up of this reaction.