Vol. 11, No.2, pp.144-149 (2018)
CO2 Hydrogenation in a Non-Thermal Plasma Aided by Supported Metal Catalysts
Y. Wang, Q. Huang, Y. Yang, and A. Wang
State Key Laboratory of Fine Chemicals, PSU-DUT Joint Center for Energy Research,
School of Chemical Engineering, Dalian University of Technology, China
Abstract
CO2 hydrogenation was conducted with H2 in a plasma-catalyst hybrid system, in which non-thermal plasma generated by dielectric barrier discharge was coupled with supported metal catalysts. Various SiO2-supported transition metals, including Co, Ni, Cu, Mo, and W, were tested as the catalysts for CO2 hydrogenation in the plasma. Among the transition metals mentionedabove, Co/SiO2 exhibited the highest activity, and the major product was CH4. In addition, SiO2, Al2O3, TiO2, MgO and mesoporous MCM-41 were used to support Co species, and the effect of catalyst support on the catalytic performance was investigated. The activities of Co/SiO2, Co/MCM-41, and Co/MgO were comparable and they were much higher than that of Co/Al2O3, whereas Co/TiO2 hardly exhibited catalytic activity. The stability of Co/SiO2 catalyst was evaluated at high GHSV in a 200 h test run, and the spent catalysts were characterized by XRD measurement and SEM observation.
Keywords - Plasma, cobalt, silica, CO2 hydrogenation, methane