Hybrid plasma-catalytic methanation of CO2 at low temperature over ceria zirconia supported Ni catalysts

Abstract

International audienceA hybrid plasma-catalytic system was used in for the hydrogenation of carbon dioxide (CO2) into methane (methanation) at atmospheric pressure and very low temperature using a dielectric barrier discharge (DBD) plasma reactor packed with Ni-CexZr1−xO2 catalysts. Three catalysts were prepared by a conventional wet impregnation method, using 15 wt% of Ni loading over ceria-zirconia mixed oxides having different Ce/Zr ratios. The physico–chemical features of both catalysts and supports were evaluated by means of X-Ray Diffraction (XRD), Temperature-Programmed Reduction of H2 (H2-TPR), Temperature Programmed-Desorption of CO2 (CO2-TPD) and Transmission Electron Microscopy (TEM). The methanation experiments in the absence or in the presence of plasma were carried out in the temperature range of 90–420 °C. The hybrid plasma 15NiCZ5842 catalyst combination was found to efficiently convert CO2 into methane even at low temperature. Indeed, CO2 conversions as high as 80%, together with 100% selectivity toward methane was measured in the presence of plasma at 90 °C. On the contrary in the absence of plasma, the same conversion and selectivity were only achieved at much higher temperatures around 300 °C, for the same catalyst

Supported Catalysts for CO2 Methanation: A Review

“…The equilibrium CO 2 conversion is reached at 340 • C. CO 2 -TPD profiles of Ni/CZ show weak and medium sites, different from Ni/Al 2 O 3 , which shows weak and strong basic sites; CO 2 adsorbed on strong basic sites cannot desorb from Ni/Al 2 O 3 surface until 700 • C. Consequently, the strongly adsorbed CO 2 on the surface does not participate in the reaction carried out from 220 • C to 400 • C. According to [166], CO 2 reacts with surface hydroxyls and surface oxygen to form hydrogen and monodentate carbonate, respectively [164,[166][167][168][169][170][171][172]. Formate species could be also important intermediates during the reaction [63,173,174].…”

Promotion effect of additive Fe on Al2O3 supported Ni catalyst for CO2 methanation

“…Additionally, dielectric barrier discharge (DBD) plasma is a simple technique for creating non‐equilibrium plasma conditions at low gas temperature and atmospheric‐pressure . Many efforts have been made to study the influence of DBD plasma on enhancing the catalytic performance . Bian and Fu studied the effect of DBD plasma on the catalyst for methanation and Fischer‐Tropsch synthesis respectively.…”

Plasma DBD activated ceria-zirconia-promoted Ni-catalysts for plasma catalytic CO2 hydrogenation at low temperature

“…However, relatively high temperatures are needed to reach acceptable conversions. Recently, it was shown that a plasma DBD catalytic process can lead to high conversions of CO 2 and high CH 4 selectivity at temperatures lower than 200°C [3,7,8,9].…”