Spectroscopic investigation into oxidative degradation of silica-supported amine sorbents for CO(2) capture.

ABSTRACT: Oxidative degradation characteristics of silica-supported amine sorbents with varying amounts of tetraethylenepentamine (TEPA) and polyethylene glycol (PEG; P(200) or P(600) represents PEG with molecular weights of 200 or 600) have been studied by IR and NMR spectroscopy. Thermal treatment of the sorbents and liquid TEPA at 100 °C for 12 h changed their color from white to yellow. The CO(2) capture capacity of the TEPA/SiO(2) sorbents (i.e., SiO(2)-supported TEPA with a TEPA/SiO(2) ratio of 25:75) decreased by more than 60 %. IR and NMR spectroscopy studies showed that the yellow color of the degraded sorbents resulted from the formation of imide species. The imide species, consisting of NH associated with two C=O functional groups, were produced from the oxidation of methylene groups in T

SUBMITTER: Srikanth CS 

PROVIDER: S-EPMC3561697 | biostudies-literature | 2012 Aug

REPOSITORIES: biostudies-literature