Reaction Characterization of CO Chemical Looping Combustion of Spinel CuMn2O4 Oxygen Carriers

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Chemical loop combustion (CLC) is an innovative combustion technology that inherently separates the greenhouse gas CO 2 while producing no NO x emissions. In this study, a CuMn 2 O 4 composite oxygen carrier was synthesized using the sol–gel method, and the chemical looping combustion performance of the carrier was examined in a fixed-bed reactor utilizing CO as the reducing medium, along with an assessment of its cyclic reaction stability. The rapid increase in oxygen release from CuMn 2 O 4 between 700 and 900 °C indicates a high reaction rate within this temperature range. Furthermore, the oxygen carrier demonstrates the capacity to release a substantial amount of oxygen consistently, with the release reaching its peak at 900 °C. The oxygen release from CuMn 2 O 4 increases significantly within the temperature range of 700–900 °C. Ten reactions involving CuMn 2 O 4 were conducted at 900 °C in an atmosphere containing 8% CO and 3% O 2 . The results demonstrated an average CO 2 selectivity of 96.44%, a CO conversion rate of 95.98%, and a CO 2 yield of 93.70%, effectively achieving near-complete capture of CO 2 . The results show that CuMn 2 O 4 can significantly improve the CO conversion activity and basically regenerate the oxygen carriers of air oxidation reduction. This study fully proves that it is feasible to achieve CO 2 capture by CuMn 2 O 4 for converter gas CO, which is the main byproduct produced by converter smelting.

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