2D-layered Ni-MgO-Al2O3 nano-sheets 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-Al2O3 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 degrees 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 H-2 is used.