Advances in solid adsorbent materials for direct air capture of CO2

Direct air capture (DAC) of CO2 is a carbon-negative technology that is not limited by time and geography, and can contribute to the realization of the “dual-carbon” goal. This paper reviews the current development of direct air capture of CO2, focuses on four mainstream solid adsorption DAC technologies, namely, MOFs, solid amine materials, alkali metal-based adsorbents, and moisture-altering materials, and analyzes their advantages and disadvantages in terms of energy consumption, cyclic stability, and adsorption capacity; in addition, the paper analyzes the engineering applications of solid adsorbent materials and demonstrates the potential of these technologies in practical applications; finally, it summarizes the challenges faced by the existing DAC adsorbent materials and puts forward the future development direction.