Direct air capture(DAC)of carbon dioxide technology is a kind of negative carbon technology.As one of the important technologies to help achieving the carbon peaking and carbon neutrality goals,DAC technology has great development prospects.The development history of DAC and the operation and development of existing DAC projects were briefly described,and some liquid DAC technologies and solid DAC technologies were introduced.The liquid DAC technologies included aqueous hydroxide sorbents,aqueous basic solutions,aqueous amino acids/BIGs and alkalinity concentration swing technologies.The solid DAC technologies included solid alkali carbonates,solid-supported amine materials,MOFs materials,moisture swing technology and so on.The technological process and related equipment of various DAC technology were summarized.The principle of various DAC technologies,carbon dioxide capture methods and adsorbent/absorbent regeneration methods were described in detail.The advantages and disadvantages of each DAC technology in terms of adsorbent/absorbent performance,regeneration temperature,regeneration energy consumption and cycle stability were analyzed.It was pointed out that it was necessary to further develop DAC adsorbents/absorbents with low cost,high adsorption/absorption performance and good cycle stability,optimize and develop adsorbent/absorbent regeneration process,and develop process strengthening technology suitable for DAC technology,so as to lay a foundation for the subsequent large-scale and commercial application of DAC.
carbon dioxidedirect air captureadsorptionabsorptiondesorption
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