Study on the Catalytic Performance of Copper-Based Composite Oxides for CO Oxidation AITranslate

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Chinese Library Classification Number:TQ426.6[化学工程]

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Copper-based composite oxide catalysts were prepared by impregnation method usingγ-Al₂O₃ spheres as carrier and Cu-Ce,Cu-Mn,Cu-Zr or Cu-Co as active components.The influence of different components,doping ratio and reaction temperature on the catalytic performance of copper-based composite oxides for CO oxidation was studied.The surface properties,reducibility,surface morphology and phase composition of the catalysts were analyzed by BET,CO-TPR,SEM and XRD.The results show that under the optimal doping ratio,the order of catalytic activity of copper-based composite oxides with different active components is as follows:Cu-Ce composite oxide>Cu-Mn composite oxide>Cu-Zr composite oxide>Cu-Co composite oxide.Among them,the Cu-Ce composite oxide exhibits the best performance,and the optimal doping ratio is n(Cu)∶n(Ce)=1∶0.1.This catalyst achieves a CO conversion rate of over 80%at 150~200℃and maintains a CO conversion rate of over 90%above 200℃.Characterization results indicate that the excellent catalytic activity of the Cu-Ce composite oxide is attributed to the uniform dispersion of active components,large specific surface area,good pore structure and strong redox ability.