In-situ IR Study on Stability of Epoxide-Functionalized Polyethyleneimine CO2 Adsorbent to NO2 and SO2 Gases

다국어 초록 (Multilingual 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.