Catalytic kinetics of dimethyl ether one-step synthesis over CeO₂-CaO-Pd/HZSM-5 catalyst in sulfur-containing syngas process

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• 作者：Ruizhi Chu¹ ; ² ; Wenxin Hou¹ ; Xianliang Meng¹ ; ² ; ^{hwxcumt@163.com} ; Tingting Xu¹ ; Zhenyong Miao¹ ; Guoguang Wu¹ ; Lei Bai³
• 关键词：CeO2&ndash ; CaO&ndash ; Pd/HZSM-5 catalyst ; DME ; One-step synthesis ; Catalytic kinetics ; Sulfur-containing syngas
• 刊名：Chinese Journal of Chemical Engineering
• 出版年：2016
• 出版时间：December 2016
• 年：2016
• 卷：24
• 期：12
• 页码：1735-1741
• 全文大小：745 K
• 卷排序：24

文摘

CeO2–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 CeO2–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 H2/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.