Cobalt-Doped Ni-Based Catalysts for Low-Temperature Co2 Methanation

Abstract

The study of the process and mechanism of CO2 activation and the development of low-temperature, high-activity and selective catalysts for CO2 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 increased the electron density around Ni, which facilitated the adsorption and activation of CO2 and H2. 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·gcat−1·h−1at 200 °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.

Keywords: Co-doped, Ni-based catalysts, low temperature, CO2 methanation, electron density