Highly stable Ni-based catalysts derived from LDHs supported on zeolite for CO2 methanation

CO₂ methanation can effectively reduce the concentration of CO₂ in the air and decrease environmental pollution. Therefore, it is essential to synthesize catalysts with high carbon deposition resistance and stability. Herein, the highly stabilized Ni-based catalysts derived from hydrotalcites are prepared by the self-sacrificial template method and used for CO₂ methanation. The prepared Ni-based catalysts maintain the morphology of the hydrotalcites precursors and the Ni particles are embedded in the AlO_x substrate. The catalyst show high performance at 350 °C, 0.1 MPa and a high space velocity of 30,000 mL g^?1 h^?1, with the conversion rate of CO₂ and selectivity of CH₄ reaching 87.5% and 100%, respectively. More importantly, the activity of catalyst does not decrease after continuous reaction for 200 h at 350 °C with different space velocities (30,000 and 60,000 mL g^?1 h^?1) owing to the confinement of the AlO_x substrate, which suppress the undesirable agglomeration and sintering of the Ni particles. This unique mosaic structure has certain reference significance for studying materials with excellent stability at high temperatures.