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Ammonium oxalate complex of niobium was investigated as an aqueous precursor for the preparation of x% Nb 2 O 5 /Al 2 O 3 (x=5, 10, 20 and 30wt.%) samples. Catalysts with the same Nb 2 O 5 contents were also prepared from the traditional niobium oxalate/oxalic acid aqueous solution. The catalysts were characterized by X-ray diffraction (XRD), diffuse...
The role of ceria, niobium and molybdenum oxides on the promotion of the NO reduction by CO was studied. A bifunctional mechanism was discussed as a function of both the nature of interaction between metal oxide and palladium and the redox properties of each metal oxide. The NO dissociation was better on the Pd/MoO 3 /Al 2 O 3 catalyst than on the Pd/CeO 2 /Al 2...
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