CO and CO2 Methanation over CeO2-Supported Cobalt Catalysts

Abstract

CO2 methanation is a promising reaction for utilizing CO2 using hydrogen generated by renewable energy. In this study, CO and CO2 methanation were examined over ceria-supported cobalt catalysts with low cobalt contents. The catalysts were prepared using a wet impregnation and co-precipitation method and pretreated at different temperatures. These preparation variables affected the catalytic performance as well as the physicochemical properties. These properties were characterized using various techniques including N2 physisorption, X-ray diffraction, H2 chemisorption, temperature-programmed reduction with H2, and temperature-programmed desorption after CO2 chemisorption. Among the prepared catalysts, the ceria-supported cobalt catalyst that was prepared using a wet impregnation method calcined in air at 500 °C, and reduced in H2 at 500 °C, showed the best catalytic performance. It is closely related to the large catalytically active surface area, large surface area, and large number of basic sites. The in situ diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) study revealed the presence of carbonate, bicarbonate, formate, and CO on metallic cobalt.

Enhanced Ni–Ce interactions to enable efficient low-temperature catalytic CO2 methanation

“…Considering the relative rarity and exorbitant price of noble metals, such as Pt, 9 Pd, 10 and Ru, 11 they cannot be extensively applied for industry despite exhibiting excellent methanation activity. For reported non-noble metal catalysts, 12 supported Ni-based catalysts have shown relatively outstanding performance and have been widely researched in the past few years. 13 A high dispersion of Ni particles was found to be important to enhance the methanation activity.…”

Addressing the CO2 challenge through thermocatalytic hydrogenation to carbon monoxide, methanol and methane

“…In this well-described system, the CO 2 conversion seems to be dependent on the preparation method. 303 The stronger Co–Ce interaction obtained by co-precipitation, with respect to wet impregnation, could be responsible for the higher activity. On a ceria–zirconia oxide, the metal–support interaction plays a fundamental role.…”

Progress in reaction mechanisms and catalyst development of ceria-based catalysts for low-temperature CO2methanation

“…have been evaluated to be active for methanation. 15,[29][30][31][32][33][34][35][36][37][38][39][40][41][42][43] Among them, Ni-based catalysts have gained extensive attention because of their relatively high methane yields and cheaper prices than the noble ones. 44 However, they are prone to deactivation due to coke formation and sintering at high temperatures.…”