Catalytic Performance of Ni-ZrO2/CNTs in CO2 Methanation

The supported catalysts Ni-ZrO2/CNT was prepared by means of impregnation so as to find out about the catalytic performance of Ni and ZrO2 in CO2 methanation.Several techniques such as X-ray diffraction, N2-sorption, scanning electron microscope, and H2-temperature-programmed reduction were employed to characterize the thus-obtained samples.Compared with Ni (7) /CNTs with 7% metallic nickel loading, ZrO2-doped Ni-ZrO2/CNTs catalysts exhibited higher catalytic activity, which increased and then decreased with the increase of ZrO2 doping.Ni (7) -ZrO2 (15) /CNTs with 15% of ZrO2 doping was found to have the best catalytic activity.It’s ascribed to the enhanced Lewis basicity of catalyst support and the restrained sintering of metallic nickel in high-temperature reduction system, which has led to the improved sorption capacity of CO2 on the Ni (7) -ZrO2 (15) /CNTs surface and sufficient reactive sites for CO2 methanation