Influence of water on high-temperature CO2 capture using layered double hydroxide derivatives

Ram Reddy, M. K., Xu, Z. P., Lu, G. Q. and Diniz da Costa, J. C. (2008) Influence of water on high-temperature CO2 capture using layered double hydroxide derivatives. Industrial & Engineering Chemistry Research, 47 8: 2630-2635. doi:10.1021/ie0716060


Author Ram Reddy, M. K.
Xu, Z. P.
Lu, G. Q.
Diniz da Costa, J. C.
Title Influence of water on high-temperature CO2 capture using layered double hydroxide derivatives
Journal name Industrial & Engineering Chemistry Research   Check publisher's open access policy
ISSN 0888-5885
Publication date 2008-04-16
Year available 2008
Sub-type Article (original research)
DOI 10.1021/ie0716060
Open Access Status DOI
Volume 47
Issue 8
Start page 2630
End page 2635
Total pages 6
Editor S. D. Alexandratos
D. R. Paul
Place of publication Washington, D. C.
Publisher American Chemical Society
Language eng
Subject C1
090401 Carbon Capture Engineering (excl. Sequestration)
960302 Climate Change Mitigation Strategies
970109 Expanding Knowledge in Engineering
Abstract Mg-Al-CO3 layered double hydroxide (LDH) was synthesized, and its thermal evolution was investigated using X-ray diffraction FTIR techniques. These patterns revealed the phase transformation of crystalline LDH to a nearly amorphous layered double oxide (LDO). LDOs derived after calcination at 400 degrees C showed good sorption potential for CO2, especially in the context of high-temperature CO2 separation from flue gases. Presence of water in the feed proved to have a positive effect as CO2 sorption increased from 2.72% (0.61 mmol/g) to 3.14% (0.71 mmol/g) tested at dry- and wet-gas conditions, respectively. CO2 sorption studies conducted using wet mixed gas (14% CO2) have also shown high sorption capacity even though CO2 concentration was diluted by almost seven times. Temperature cycling in wet conditions demonstrated high levels (75%) of desorption, which reached an equilibrium value (67%) after initial stabilization. Shorter time cycles (10 min). were found to be more effective in improving the overall efficiency of the process. Regeneration of the LDOs at 400 degrees C retrieved more than 90% of the original sorption capacity.
Keyword Hydrotalcite-Like Compounds
Carbon-Dioxide
Adsorption
Separation
Membranes
Evolution
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

 
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Created: Wed, 25 Mar 2009, 22:34:31 EST by Amanda Lee on behalf of School of Chemical Engineering