Effect of Bimetal Oxide Doping on the Aging Performance of Catalyzed DPF
Based on XRD,XPS,H2-TPR and other characterization methods for evaluation of physical and chemical properties and catalyst activity,the physical and chemical properties and catalytic activity of catalyzed diesel particle filter(CDPF)samples doped with different bimetal oxides under hydrothermal aging condition were studied.The results show that Ce-Zr bimetal oxide-doped sample has good stability in phase structure and cell parameters,Zr-Fe bimetal oxide-doped sample can better inhibit the dispersity of noble metal on carrier's surface.For Fe-Ce and Zr-Fe bimetal oxide-doped CDPF samples,during high-temperature aging process,the dispersed metal oxides undergo solid solution again,which will cause the formation of solid solution and more oxygen vacancies.After experiencing high-temperature hydrothermal aging process,the diffraction characteristic peaks of samples all migrate by various degrees towards the high-temperature direction.Fe-Ce bimetal oxide-doped sample shows a low degree of migration while Ce-Zr bimetal oxide-doped sample is higher.Fe-Ce and Zr-Fe bimetal oxide-doped samples after aging show higher oxidation activity of CO and low-level degradation.Ce-Zr bimetal oxide-doped sample after aging shows a slight decrease in the oxidation activity of C3H8.The catalytic activity for NO of Ce-Zr bimetal oxide-doped sample decreases slightly after high-temperature hydrothermal aging process.
bimetal oxideCDPFPhysical and chemical propertiescatalytic activityaging performance
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