Enhancing CO2 separation for pre-combustion capture with hydrate formation in silica gel pore structure

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This communication reports the enrichment of the hydrate phase with CO2 in gas hydrates formed from a CO2 and H-2 gas mixture when using silica gels to form the hydrate. Phase composition analysis showed that the CO2 concentrations in the retrieved gas from hydrates were in the range of 96.5 and 98.7 mol% at the range of 6.0-9.2 MPa at 274.15 K in 100 nm silica gel. C-13 NMR spectra supplemented the phase composition analysis and suggested that CO2 molecules occupy 93% of small cages and 100% of large cages in the hydrate phase. It is noted that the obtained CO2-rich hydrate, by implementing a silica gel pore structure, has a composition of (0.14H(2)/1.86 CO2)(S)center dot(6CO(2))(L)center dot 46H(2)O, which provides the quite promising idea of separating CO2 from an industrial gas containing H-2 such as shifted synthesis gas, for pre-combustion capture. (C) 2010 Elsevier B.V. All rights reserved.
Publisher
ELSEVIER SCIENCE SA
Issue Date
2010-07
Language
English
Article Type
Article
Keywords

CARBON-DIOXIDE; CLATHRATE HYDRATE; PHASE-EQUILIBRIUM; GAS-MIXTURES; FLUE-GAS; CO2/H-2/C3H8; RECOVERY; HYDROGEN

Citation

CHEMICAL ENGINEERING JOURNAL, v.161, no.1-2, pp.308 - 312

ISSN
1385-8947
DOI
10.1016/j.cej.2010.04.032
URI
http://hdl.handle.net/10203/102619
Appears in Collection
ME-Journal Papers(저널논문)
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