Cobalt-doped Ni-based catalysts for low-temperature CO2 methanation

The study of the process and mechanism of CO(2 )activation and the development of low-temperature, high-activity and selective catalysts for CO(2 )methanation are current research hotspots. In this paper, a series of Ni/ Al2O3 catalysts with different Co contents were prepared by using layered double hydroxides (LDHs) as precursors for low-temperature CO2 methanation, and the incorporation of Co promoted the electron transfer from Ni to Co, which facilitated the adsorption and activation of CO2 and H-2. The spent catalyst still maintained the layered structure with no significant change in the metal particle size, indicating that the addition of Co significantly improved the long-term stability of the catalysts. The CO2 conversion was 55.5 % and STYCH4 was 148.0 mmol & sdot;gcat (- 1) h(- 1) at 200 degrees C, 2.0 MPa and 1000 h(- 1). The in situ DRIFTS experiments showed that the addition of Co accelerated the conversion of the reaction intermediates and promoted the generation of methane.