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The synthesis of Cu-rich, Al<sub>2</sub>O<sub>3</sub> stabilized oxygen carries using a co-precipitated technique: Redox and carbon formation characteristics.
MedLine Citation:
PMID:  22356662     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
Chemical looping combustion (CLC) is an emerging, new technology for carbon capture and storage (CCS). Copper-based oxygen carriers are of particular interest due to their high oxygen carrying capacity and reactivity, low tendency for carbon deposition, and exothermic reduction reactions. In this work, CuO-based and Al2O3 stabilized oxygen carriers with high CuO loadings were developed using a co-precipitation technique. The cyclic redox performance of the synthesized oxygen carriers was evaluated at 800 °C in a laboratory-scale fluidized bed reactor using a reducing atmosphere comprised of 10 vol. % CH4 and 90 vol. % N2. The CuO content in the oxygen carrier was found to increase with the pH value at which the co-precipitation was performed. The oxygen carrying capacity of the oxygen carrier containing 87.8 wt. % CuO was found to be high (5.5 mmol O2/g oxygen carrier) and stable over 25 redox cycles. Increasing the CuO content further, i.e. > 90 wt. % resulted in materials which showed a decreasing oxygen carrying capacity with cycle number. It was also shown that the incorporation of K+ ions in the oxygen carrier can avoid the formation of the spinel CuAl2O4 and significantly reduce carbon deposition.
Authors:
Qasim Imtiaz; Agnieska Kierzkowska; Christoph Rüdiger Mueller
Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2012-2-22
Journal Detail:
Title:  Environmental science & technology     Volume:  -     ISSN:  1520-5851     ISO Abbreviation:  -     Publication Date:  2012 Feb 
Date Detail:
Created Date:  2012-2-23     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0213155     Medline TA:  Environ Sci Technol     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
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