Propanediamine-based absorbents with functionalized hydroxypropyl for efficient CO2 capture via intramolecular synergy

Wu Chen, Shaojun Jia, Jin Huang, Yi Li, Qi Wang, Xiao Qin Liu, Yao Jiang, Peng Cui

Research output: Contribution to journalArticlepeer-review

Abstract

Chemical absorption is currently the dominant industrialized technology for CO2 capture. The development and application of efficient and energy-saving absorbents are crucial for the advancement of chemical absorption of CO2. This study presents a novel propanediamine-based absorbent, N-(2-hydroxypropyl)-N-methyl-1,3-propanediamine (HPMAPA), achieved by functionalizing the secondary amine of N-methyl-1,3-propanediamine (MAPA) with hydroxypropyl group. Experimental results demonstrated that, compared to MAPA, HPMAPA exhibited improved stability, a 42% enhancement in cyclic CO2 absorption capacity, and a 20% reduction in regeneration energy consumption, lowering it to 2.33 GJ·t−1 CO2. The structure–activity relationship of HPMAPA for CO2 capture was revealed through structural deconstruction of HPMAPA. Moreover, the effect of intramolecular hydroxypropyl on the CO2 capture performance of HPMAPA and the corresponding CO2 capture mechanism were elucidated by density functional theory (DFT) calculations and quantitative NMR analysis. Such a newly developed propanediamine-based absorbent, with its efficient CO2 capture performance, shows great potential for industrial applications.

Original languageEnglish
Article number131353
JournalSeparation and Purification Technology
Volume361
DOIs
StatePublished - 19 Jul 2025

Keywords

  • Absorption mechanism
  • CO capture
  • Chemical absorption
  • Hydroxypropyl
  • Propanediamine

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