Carbon dioxide (CO₂) adsorption from air and storage is a developing technology that can achieve negative carbon emissions, therefore easing climate deterioration. However, adsorbing CO₂ from air is still a challenge when compared to the high CO₂ concentration sources such as flue gas and syngas because it is hard to separate the steady and dilute target gas accurately with a moderate approach. Most related literatures focus on the development of adsorbents for higher adsorption capacity and lower regeneration energy consumption. However, studies on practical factors and adsorption processes are also necessary for engineering applications. Based on research of the CO₂ adsorption, an introduction to recent advances in dilute CO₂ adsorption using physical or chemical adsorbents is presented, and practical factors are emphasized. From the aspect of structure-property relationships, porous structure optimization of adsorbents is discussed for better equilibrium capacity and adsorption kinetics. Effects of practical parameters (such as moisture, fluctuating temperature, and oxygen) on working performance, especially stability of adsorbents, are revealed. Moisture influences are complex and multifaceted, so possible mechanisms of the moisture influences are summarized to help readers understand. Adsorption processes of capturing CO2 from air are also discussed and compared, distinguishing from the adsorption processes with other feeds. Energy supply and gas-solid contactors which are vital in practical adsorption process are discussed separately.

中文翻译：

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空气中CO 2吸附的最新研究进展

从空气和储存中吸收二氧化碳（CO ₂）是一项正在发展的技术，可以实现负碳排放，从而缓解气候恶化。但是，与高浓度的烟道气和合成气等高浓度CO ₂气源相比，从空气中吸收CO ₂仍然是一个挑战，因为很难用适度的方​​法准确地分离出稳定的和稀薄的目标气。大多数相关文献集中于开发具有更高吸附容量和降低再生能量消耗的吸附剂。但是，对于工程应用，还需要对实际因素和吸附过程进行研究。基于对CO ₂吸附的研究，介绍了稀释CO的最新进展₂提出了使用物理或化学吸附剂的吸附方法，并强调了实际因素。从结构-性能关系的角度，对吸附剂的多孔结构进行了优化，以期获得更好的平衡容量和吸附动力学。揭示了实际参数（例如水分，温度波动和氧气）对工作性能（尤其是吸附剂稳定性）的影响。水分影响是复杂且多方面的，因此总结了水分影响的可能机理，以帮助读者理解。还讨论并比较了从空气中捕获CO2的吸附过程，以区别于其他进料的吸附过程。分别讨论了在实际吸附过程中至关重要的能量供应和气固接触器。