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Received July 16, 2008
Accepted October 30, 2008
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Continuous O2-CO2 production using a Co-based oxygen carrier in two parallel fixed-bed reactors
Key Laboratory for Thermal Science and Power Engineering of Ministry of Education of China,Department of Thermal Engineering, Tsinghua University, Beijing 100084, China
lizs@mail.tsinghua.edu.cn
Korean Journal of Chemical Engineering, May 2009, 26(3), 845-849(5), 10.1007/s11814-009-0141-7
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Abstract
Oxygen-enriched carbon dioxide stream with oxygen concentration higher than 20 vol% was produced continuously by using a Co-based oxygen carrier packed in two parallel fixed-bed reactors operated in a cyclic manner. Oxygen was absorbed by the oxygen carrier with air being fed. An oxygen-enriched carbon dioxide stream was obtained when the fixed-bed was regenerated with carbon dioxide as a purge gas. Multiple absorption and desorption cycles indicated that the Co-based oxygen carrier had high cyclic stability. XRD analysis determined the absorbed and desorbed products were Co3O4 and CoO, respectively. The TGA results indicated that Co-based oxygen carrier did not react with NO or SO2 during the desorption stage. This Co-based oxygen carrier offers potential for applications in the O2-CO2 production for the oxy-fuel coal combustion process.
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