A CO 2 solid sorbent based on polyethyleneimine 10k (PEI-10k) impregnated into mesoporous silica (MPS) foam was synthesized and utilized to capture CO 2 at temperatures ranged from 65°C to 95°C. The calculated nitrogen and carbon contents in the bulk of the PEI-10k/MPS sorbent were similar to the XPS results measured on the surface of the foam, suggesting that the PEI was homo-geneously distributed throughout the MPS support. After CO 2 adsorptionthe N 1s peak was broadened and could be resolved into two components: a high binding energy component (~401 eV) and a lower binding energy one (396 eV), respectively. The former nitrogen states are consistent with a protonated amine, presumably, due to carbamate formation. The lower binding energy component (~396 eV) could possibly be due to strongly chemisorbed CO 2 . The maximum sorption capacity was about 4 mmole CO 2 /g sorbent at 85°C and 1 bar. This capacity was doubled by raising the CO 2 pressure to 24.95 bars. The adsorption results can be described by a Langmuir adsorption isotherm.
KeywordsXPSAdsorption Isotherm of CO<sub>2</sub>Polyethyleneimine 10k<i>Mesoporous silica</i>
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