Spectroscopic analysis of carbon dioxide and nitrogen mixed gas hydrates in silica gel for CO2 separation

In this study solid-state NMR spectroscopy was used to identify structure and guest distribution of the mixed N-2 + CO2 hydrates. These results show that it is possible to recover CO, from flue gas by forming a mixed hydrate that removes CO2 preferentially from CO2/N-2 gas mixture. Hydrate phase equilibria for the ternary CO2-N-2-water system in silica gel pores were measured, which show that the three-phase H-L-w-V equilibrium curves were shifted to higher pressures at a specific temperature when the concentration of CO2 in the vapor phase decreased. C-13 cross-polarization (CP) NMR spectra of the mixed hydrates at gas compositions of more than 10 mol% CO, with the balance N-2 identified that the crystal structure of mixed hydrates as structure 1, and that the CO2 molecules occupy mainly the abundant 5 12 6 2 cages. This makes it possible to achieve concentrations of more than 96 mol% CO2 gas in the product after three cycles of hydrate formation and dissociation. (c) 2006 Elsevier B.V. All rights reserved.
Publisher
ELSEVIER SCIENCE BV
Issue Date
2006-06
Language
ENG
Keywords

C-13 NMR-SPECTROSCOPY; X-RAY-DIFFRACTION; CAGE OCCUPANCY; METHANE; GUEST; OCEAN

Citation

CATALYSIS TODAY, v.115, no.1-4, pp.279 - 282

ISSN
0920-5861
DOI
10.1016/j.cattod.2006.02.059
URI
http://hdl.handle.net/10203/3457
Appears in Collection
CBE-Journal Papers(저널논문)
  • Hit : 698
  • Download : 3
  • Cited 0 times in thomson ci
This item is cited by other documents in WoS
⊙ Detail Information in WoSⓡClick to seewebofscience_button
⊙ Cited 18 items in WoSClick to see citing articles inrecords_button

qr_code

  • mendeley

    citeulike


rss_1.0 rss_2.0 atom_1.0