Intrinsic Kinetics of Dimethyl Ether Synthesis from Plasma Activation of CO₂ Hydrogenation over Cu-Fe-Ce/HZSM-5

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• 作者：Tongming Su ; Xinhui Zhou ; Prof. Dr. Zuzeng Qin and Prof. Dr. Hongbing Ji
• 刊名：ChemPhysChem
• 出版年：2017
• 出版时间：February 2, 2017
• 年：2017
• 卷：18
• 期：3
• 页码：299-309
• 全文大小：1051K
• ISSN：1439-7641

文摘

CO₂ is activated in a plasma reactor followed by hydrogenation over a Cu–Fe–Ce/HZSM-5 catalyst, and the intrinsic kinetics of the plasma catalytic process are studied. Compared with CO₂ hydrogenation using Cu–Fe–Ce/HZSM-5 alone, the CO₂ conversion and the dimethyl ether selectivity for the plasma catalytic process are increased by 16.3 %, and 10.1 %, respectively, indicating that the CO₂ was activated by the plasma to promote hydrogenation. A study of the intrinsic kinetics shows that the activation energies of methanol formation, the reverse water–gas shift reaction, and methanol dehydration to dimethyl ether are 149.34, 75.47, and 73.18 kJ mol⁻¹, respectively, which are lower than if Cu–Fe–Ce/HZSM-5 is used without plasma, indicating that the activation of CO₂ in the plasma reduces the activation energy of the hydrogenation reaction and improves the yield of dimethyl ether.