Fe-Ce Composite Oxide Catalysts Supported on 3D Nickel Foam for Catalytic Oxidation of Soot

To reduce the combustion temperature of diesel soot, the Fe-Ce composite oxide catalysts with varying composition supported by three-dimensional nickel foams were prepared by hydrothermal reaction and impregnation method. The internal structure and performance of the monolithic catalysts were characterized by X-ray diffraction, Raman, scanning electron microscope, X-ray photoelectron spectroscopy and catalyst activity evaluation techniques. The results revealed that when the molar ratio of Ce and Fe was 0.5, the CeO2/Fe2O3@NF catalyst showed the best catalytic activity of soot oxidation, good stability and water resistance. Besides, the addition of NO and H2O was helpful to improve the catalytic performance for soot oxidation, when 10 % H2O and 800 ppm NO were mixed into 20 %O-2/N-2 atmosphere, the T-10, T-50 and T-90 values could decrease to 299 degrees C, 344 degrees C and 389 degrees C, respectively.