Research progress of CO2 absorbent in postcombustion capture process

Excessive emissions of greenhouse gases, particularly carbon dioxide (CO₂), are the primary culprits behind the phenomenon of global warming, and reducing CO₂ emissions has become the primary global concern for all countries. CO₂ capture, utilization, and storage (CCUS) technology is a key strategy in achieving the goals of the dual carbon strategy, and carbon capture is one of the most critical technology links. However, the development of chemical absorbents have been hindered by these problems such as poor absorption rate, low absorption capacity, poor stability, high energy consumption for regeneration, and high recovery cost. Therefore, how to realize the development and industrial application of CO₂ chemical absorbents with efficient capture and low energy consumption for regeneration is an extremely severe challenge to be broken through at present. Herein, the current research progress of chemical absorbents is summarized and discussed in depth, which focuses on the absorption mechanism, absorption performance, advantages, and disadvantages of various absorbents. Subsequently, the existing problems and corresponding solutions for the research system are pointed out. Finally, the future development direction of absorbents is prospected.