Catalytic kinetics of dimethyl ether one-step synthesis over CeO_2–CaO–Pd/HZSM-5 catalyst in sulfur-containing syngas process

• Published in: 中国化学工程学报：英文版 2016, Vol.24 (12), p.1735-1741
• Main Author: Ruizhi Chu Wenxin Hou Xianliang Meng Tingting Xu Zhenyong Miao Guoguang Wu Lei Bai
• Format: Article
• Language: English
• ISSN: 1004-9541; 2210-321X

CeO_2–CaO–Pd/HZSM-5 catalyst was prepared for the dimethyl ether（DME） one-step synthesis in a continuous fixed-bed micro-reactor from the sulfur-containing syngas. The catalytic stability over hybrid catalyst of CeO_2–CaO–Pd/HZSM-5 was investigated to ensure that the kinetics experimental results were not significantly influenced by induction period and catalytic deactivation. A large number of kinetic data points（40 sets） were obtained over a range of temperature（240–300 °C）, pressure（3–4 MPa）, gas hourly space velocity（GHSV）（2000–3000 L·kg~（-1）·h~（-1）） and H_2/CO mole ratio（2–3）. Kinetic model for the methanol synthesis reaction and the dehydration of methanol were obtained separately according to reaction mechanism and Langmuir–Hinshelwood mechanism. Regression parameters were investigated by the method combining the simplex method and Runge–Kutta method. The model calculations were in appropriate accordance with the experimental data.