Continuous O_2-CO_2 production using a Co-based oxygen carrier in two parallel fixed-bed reactors

摘要

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 Co_3O_4 and CoO, respectively. The TGA results indicated that Co-based oxygen carrier did not react with NO or SO_2 during the desorption stage. This Co-based oxygen carrier offers potential for applications in the O_2-CO_2 production for the oxy-fuel coal combustion process.