Highly efficient capture of CO2 through the synergy of intramolecular amines within piperazine‐derived alcoholamines

Abstract Amine‐scrubbing‐based chemical absorption remains a prominent CO 2 capture process. However, the overall efficiency of conventional amine absorbents is hard to meet the ever‐increasing demands for CO 2 capture. Consequently, developing powerful absorbents for efficient and cost‐effective CO 2 capture is greatly important but challenging. Here, a new type of amine absorbent with improved solubility and stability was achieved by substituting the secondary amino groups in piperazine (PZ) with aminoethyl and hydroxyalkyl moieties. The developed amine absorbent presents superior CO 2 absorption/desorption abilities through the synergy of their intramolecular amines, leading to a low regeneration energy consumption of 2.56 GJ·t −1 CO 2 . Moreover, the enhancement of CO 2 capture and the corresponding mechanism were elucidated using density functional theory calculations and nuclear magnetic resonance analysis. Such newly developed amine absorbent with excellent CO 2 capture performance are expected to greatly contribute to ongoing efforts toward carbon neutrality.