Influence of materials packing modes

https://doi.org/10.1016/j.gce.2021.11.009

“Currently, the iCCC-Methane is mainly carried out in fixed-bed reactors, and various packing modes, such as the multilayer bed mode [17], dual-bed mode [37], physical mixing mode [[38], [39], [40]], and integrated mode [16,26,[41], [42], [43]] also have been developed to investigate their effects on the performance of CO₂ capture and methanation (Fig. 3). Miguel et al. [17] reported a successful iCCC-Methane by using the dual-bed composed of commercial Ni-based methanation catalyst and K-modified hydrotalcite adsorbent, and achieved CO₂ adsorption capacity of 3 mmol g⁻¹ and methane production of 2.36 mol g⁻¹ h⁻¹ under continuous operation conditions. Jones et al. [39] compared the CO₂ capture and methanation performance by the dual-bed mode and physical mixing mode of NaNO₃/MgO adsorbent and Ru/Al₂O₃ catalyst. Superior to the physical mixing mode, the CO₂ adsorption capacity is up to 3.24 mmol g⁻¹, while the methane yield is up to 2.21 mmol g⁻¹ in the dual-bed mode. Wei et al. [44] reported an iCCC-Methane in the simulated flue gas at 200 °C by using a DFM of 2D-layered Ni–MgO–Al₂O₃ nanosheets. Continuously, a nearly 100% CO₂ capture and successful methanation were demonstrated at the same temperature and prolonged cycles.”