13C-NMR spectroscopic study on chemical species in piperazine-amine-CO2-H2O system before and after heating

Miho Nitta, Masaki Hirose, Toru Abe, Yukio Furukawa*, Hiroshi Sato, Yasuro Yamanaka

*Corresponding author for this work

Research output: Contribution to journalConference articlepeer-review

10 Citations (Scopus)


Chemical reactions associated with the absorption of CO2 into aqueous solutions of blends of piperazine (PZ) with N-methyldiethanolamine (MDEA), etc. were studied by 13C-NMR spectroscopy. The coexistence of PZ and MDEA enhanced the initial apparent rate of HCO-3 /CO2-3 formation. This result can be explained by considering that PZ monocarbamate rapidly formed works as an organocatalyst in the formation reaction of HCO-3 . Concentration changes of chemical species in CO2-absorbed aqueous amine solutions upon heating (80 °C, 30 min) were studied by 13C-NMR spectroscopy. Carbon dioxide regeneration originates mainly from HCO-3 /CO2-3, and not from carbamate and carbonate.

Original languageEnglish
Pages (from-to)869-876
Number of pages8
JournalEnergy Procedia
Publication statusPublished - 2013 Jan 1
Event11th International Conference on Greenhouse Gas Control Technologies, GHGT 2012 - Kyoto, Japan
Duration: 2012 Nov 182012 Nov 22


  • Amine
  • Carbamate
  • Carbon dioxide
  • Piperazine

ASJC Scopus subject areas

  • Energy(all)


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