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In this study, we investigated the influence of O 2 , SO 2 , and NO x  on branched and linear polyethyleneimine (PEI) functional silica CO 2  adsorbents (BPEI-SiO 2  and LPEI-SiO 2 , respectively). O 2  was much more likely to oxidize BPEI-SiO 2 , compared with LPEI-SiO 2 , to form C=O and C=N groups and led to a 23.0% decrease in the CO 2  adsorption capacity after 990 min of cumulative contact with 10% O 2 . In contrast, LPEI-SiO 2  lost only approximately 3.6% of its CO 2  adsorption capacity, although O 2  oxidized LPEI-SiO 2  to form C=O groups. SO 2  can cause severe degradation of BPEI-SiO 2  and LPEI-SiO 2  by forming heat-stable NH 3  + —and/or NH 2  + —containing adducts and by promoting the formation of urea linkages. After cumulative contact with 10, 50, and 200 ppm SO 2  for 990 min, BPEI-SiO 2  lost 18.2%, 61.4%, and 89.0% of its CO 2  adsorption capacity, and LPEI-SiO 2  lost 18.5%, 60.6%, and 78.5% of its CO 2  adsorption capacity, respectively. NO 2  at 10 ppm and NO at 200 ppm caused almost no loss in CO 2  adsorption capacity after cumulative contact for 990 min, but both led to degradation of adsorbents. NO 2  can cause irreversible formation of NH 3  + —and/or NH 2  + —containing adducts, acid products, N-nitro compounds (N–NO 2 ), C-nitroso compounds (C–N=O), and C-nitro (C–NO 2 ) compounds, and can promote the formation of urea linkages. NO can lead to the formation of NH 3  + —and/or NH 2  + —containing adducts and N-nitroso (N–N = O) compounds.

An investigation into the adverse effects of O2, SO2, and NOx on polyethyleneimine functional CO2 adsorbents