Combustion characteristics of coke oven gas chemical looping of copper-based oxygen carrier
Coke oven gas(COG)is a major byproduct generated during the coking process,containing complex gas components such as CO,H2,CH4,and CO2.Chemical looping combustion is a technology that efficiently converts COG and captures high-purity carbon diox-ide.A series of x(％)CuO/Ce-Zr-O(x=30,50,70,90)oxygen carriers were prepared using the sol-gel method for the study of chem-ical looping combustion characteristics of COG.XRD analysis indicates that the phases of x(％)CuO/Ce-Zr-O oxygen carriers consist of a solid solution of CuO and Ce0.67Zr0.33O2.Due to the incorporation of Zr4+ions into the CeO2 lattice,a distinct oxygen vacancy Raman char-acteristic peak appears at 617 cm-1.H2-TPR,CO-TPR,CH4-TPR,and COG-TPR results suggest that the addition of Ce-Zr-O solid solution enhances the low-temperature oxygen release capacity of copper species.Under conditions of 800 ℃,the CO2 capture rate of the CuO sample is 34％,which increases to 100％with the addition of 10％Ce0 67 Zr0 33 O2.After 50 cycles of oxidation-reduction,the per-formance of the CuO sample significantly deteriorates,while the reactivity and phase structure of the 90CuO/Ce-Zr-O sample remain largely unchanges.This indicates that the interaction between CuO and Ce0.67Zr0.33O2 enhances the oxygen release capacity and cycling sta-bility of copper species.This research contributes to expanding the utilization pathways of COG.
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