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Issue 4, 2014
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Oxidative degradation of silica-supported polyethylenimine for CO2 adsorption: insights into the nature of deactivated species

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Abstract

The oxidative degradation of polyethylenimine-impregnated mesoporous SBA-15 silica for CO2 capture was investigated at the molecular level. The adsorbents were exposed to flowing air at different temperatures, and their degree of deactivation was evaluated through the measurement of CO2 adsorption capacity prior and subsequent to air exposure. A solvent-extraction method was employed to isolate the deactivated species from the silica support. The extracted species were investigated by a variety of 1D and 2D NMR techniques such as 13C, 1H, 1H–15N HMBC, 1H–13C HMQC, and 1H–13C HMBC. This in-depth investigation showed that they contain predominantly fragments involving imine and carbonyl groups. Several structural units were conclusively established.

Graphical abstract: Oxidative degradation of silica-supported polyethylenimine for CO2 adsorption: insights into the nature of deactivated species

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Publication details

The article was received on 16 Sep 2013, accepted on 19 Nov 2013 and first published on 19 Nov 2013


Article type: Paper
DOI: 10.1039/C3CP53928H
Citation: Phys. Chem. Chem. Phys., 2014,16, 1529-1535
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    Oxidative degradation of silica-supported polyethylenimine for CO2 adsorption: insights into the nature of deactivated species

    A. Ahmadalinezhad and A. Sayari, Phys. Chem. Chem. Phys., 2014, 16, 1529
    DOI: 10.1039/C3CP53928H

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