Continuous Direct Air Capture and Conversion Tandem System Applicable to a Wide Range of CO2 Concentrations
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The concentrations of CO 2 emitting from different CO 2 sources vary significantly. Thus, processes capable of accommodating a broad range of CO 2 concentrations, from 0.04% (air) to tens of percent (power plants), must be developed to achieve carbon neutrality. In this study, we developed a two-step CO 2 capture and hydrogenation system by employing Rb-oxide-incorporated zeolites as CO 2 adsorbents and Ni/CeO 2 or Cu/ZnO/Al 2 O 3 as catalysts for CO 2 hydrogenation. This process is suitable for continuous operation over a temperature swing of 40–200°C. Notably, this system can operate at low temperatures (below 200°C) using a simple temperature-swing process in the presence of O 2 . Compared with more than 100 previously reported systems that can convert CO 2 including O 2 to green fuels such as CO or CH 4 , the proposed system achieved the best CO 2 conversions to CH 4 and CO.
