2D-Layered Ni-MgO-Al₂ O₃ Nanosheets for Integrated Capture and Methanation of CO₂

CO₂ capture is an enabling technology for carbon conversion and storage; however, the high costs of the process have hindered its large-scale application so far. Therefore, new approaches for carbon abatement, particularly from diluted sources, are urgently needed. Herein, based on the adsorption and catalysis bifunctionality of 2D-layered Ni-O-Al₂ O₃ nanosheets, a two-step "capture and methanation" process is reported for the removal and utilization of CO₂ , with no additional energy input for desorption being required. Continuous and nearly 100 % capture of CO₂ was demonstrated at low temperatures (≤250 °C) and prolonged cycles. At isothermal conditions, the material could be fully regenerated with the production of methane, showing considerably higher time efficiency than temperature-swing and pressure-swing technologies. This strategy may pave a new way for CO₂ reduction, providing a scalable connection between the power grid and the gas grid when H₂ is used.