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- Conflict of Interest
- In relation to this article, we declare that there is no conflict of interest.
- Publication history
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Received November 4, 2024
Accepted November 25, 2024
Available online January 25, 2025
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This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/bync/3.0) which permits
unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
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In-situ IR Study on Stability of Epoxide-Functionalized Polyethyleneimine CO 2 Adsorbent to NO 2 and SO 2 Gases
https://doi.org/10.1007/s11814-024-00350-8
Abstract
This study investigates the stability of amine-impregnated CO 2 adsorbents, specifi cally polyethyleneimine (PEI) and epoxybutane-
modifi ed PEI (EB-PEI), when exposed to acidic gases like SO 2 and NO 2 . Using in-situ FT-IR spectroscopy, the
formation of degradation products such as nitro groups, NH 2 –SO 2 , NH 2 –NO 2 complexes, and amides was identifi ed. These
degradation species were observed to form more rapidly at higher temperatures, with NO 2 causing more signifi cant oxidation
compared to SO 2 . The study evaluated the impact of acid gas exposure on CO 2 adsorption performance, revealing that
higher concentrations of acidic gases led to a substantial decrease in adsorption capacity. SO 2 had a more detrimental eff ect
on the CO 2 adsorption capacity than NO 2 , and EB-PEI exhibited greater resistance to SO 2 due to its higher proportion of
secondary amines.
