Intrinsic kinetics of one-step dimethyl ether synthesis from hydrogen-rich synthesis gas over bi-functional catalyst

摘要

The reaction kinetics of the dimethyl ether synthesis from hydrogen-rich synthesis gas over bi-functional catalyst was investigated using an isothermal integral reactor at 220-260 °C temperature, 3-7 MPa pressure, and 1,000-2,500 mL/g·~h space velocity. The H_2/CO ratio of the synthetic gas was chosen between 3 :1 and 6:1. The bi-functionai catalyst was prepared by physically mixing commercial CuO/ZnO/Al_2O_3 and The three reactions, including methanol synthesis from CO and CO, as well as methanol dehydration, were chosen as independent reactions. The Langmuir-Hinshelwood kinetic models for dimethyl ether synthesis were adopted. Kinetics parameters were obtained using the Levenberg-Marquardt mathematical method. The model was reliable according to statistical and residual error analyses. The effects of different process conditions on the reactor performance were also investigated.