Thermal and chemical stability of regenerable solid amine sorbent for CO{sub 2} capture

The adsorption and desorption of CO{sub 2} and SO{sub 2} on an amine-grafted SBA-15 sorbent has been studied by in situ infrared spectroscopy coupled with mass spectrometry. CO{sub 2} adsorbed on an amine-grafted sorbent as carbonates and bicarbonates, while SO{sub 2} adsorbed as sulfates and sulfit...

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Bibliographic Details
Published inEnergy & fuels Vol. 20; no. 4
Main Authors Rajesh A. Khatri, Steven S. C. Chuang, Yee Soong, McMahan Gray
Format Journal Article
LanguageEnglish
Published United States 15.08.2006
Subjects
01 COAL, LIGNITE, AND PEAT
ADSORBENTS
ADSORPTION
AMINES
CAPTURE
CARBON DIOXIDE
DESORPTION
DESULFURIZATION
ENVIRONMENTAL SCIENCES
INFRARED SPECTRA
MASS SPECTROSCOPY
SORPTIVE PROPERTIES
SULFUR DIOXIDE
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Summary:The adsorption and desorption of CO{sub 2} and SO{sub 2} on an amine-grafted SBA-15 sorbent has been studied by in situ infrared spectroscopy coupled with mass spectrometry. CO{sub 2} adsorbed on an amine-grafted sorbent as carbonates and bicarbonates, while SO{sub 2} adsorbed as sulfates and sulfites. The CO{sub 2} adsorption capacity of the amine-grafted sorbent was almost twice as much as that of a commercial sorbent. The adsorption of CO{sub 2} in the presence of H{sub 2}O and D2O shows an isotopic shift in the IR frequency of adsorbed carbonate and bicarbonate bands, revealing that water plays a role in the CO{sub 2} adsorption on amine-grafted sorbents. Although the rate of adsorption of SO{sub 2} was slower than that of CO{sub 2}, the adsorbed S surface species is capable of blocking the active amine sites for CO{sub 2} adsorption. A temperature-programmed degradation study of the amine-grafted sorbent showed that the surface amine species are stable up to 250{sup o}C in air. 42 refs., 13 figs.
ISSN:0887-0624
1520-5029
DOI:10.1021/ef050402y