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Seo, Yongwon
Advanced Clean Energy Lab (ACE Lab)
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  • Gas Hydrates, Greenhouse Gas, Clean Energy

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Semiclathrate-based CO2 capture from flue gas mixtures: An experimental approach with thermodynamic and Raman spectroscopic analyses

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Title
Semiclathrate-based CO2 capture from flue gas mixtures: An experimental approach with thermodynamic and Raman spectroscopic analyses
Author
Kim, SoyoungSeo, Yongwon
Issue Date
2015-09
Publisher
ELSEVIER SCI LTD
Citation
APPLIED ENERGY, v.154, pp.987 - 994
Abstract
Semiclathrate-based CO2 capture from flue gas in the presence of various quaternary ammonium salts (QASs) such as tetra-n-butyl ammonium bromide (TBAB), tetra-n-butyl ammonium chloride (TBAC), and tetra-n-butyl ammonium fluoride (TBAF) was investigated with a primary focus on the thermodynamic, kinetic, and spectroscopic aspects. The thermodynamic stability of the CO2 (20%) + N-2 (80%) + QAS semiclathrates was examined with an isochoric method using a high pressure reactor as well as with dissociation enthalpy measurement using a high pressure micro-differential scanning calorimeter (HP mu-DSC). The TBAF semiclathrate with CO2 (20%) + N-2 (80%) showed the most significant equilibrium pressure reduction at a specified temperature. However, the TBAC semiclathrate had the highest gas uptake and steepest CO2 concentration change in the vapor phase, which indicates the largest gas storage capacity for CO2 capture. CO2 was observed to be preferentially captured and enriched to approximately 60% in the semiclathrate phase. The CO2 selectivity was independent of the type of QASs used. The Raman spectroscopic results revealed that both CO2 and N-2 are enclathrated in the small cages of the QAS semiclathrates and that the enclathration of guest gas molecules does not change the structure of the semiclathrates. (C) 2015 Elsevier Ltd. All rights reserved
URI
https://scholarworks.unist.ac.kr/handle/201301/17525
URL
http://www.sciencedirect.com/science/article/pii/S0306261915007400
DOI
10.1016/j.apenergy.2015.05.107
ISSN
0306-2619
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