COMPOSITE METAL OXIDE AND PRODUCTION METHOD OF THE SAME, NITROGEN OXIDE DECOMPOSITION CATALYST USING THE COMPOSITE METAL OXIDE, AND DECOMPOSITION METHOD OF NITROGEN OXIDE USING THE NITROGEN OXIDE DECOMPOSITION CATALYST

摘要

PROBLEM TO BE SOLVED: To provide a composite metal oxide for forming a nitrogen oxide decomposition catalyst having sufficiently high decomposition activity on nitrogen oxides.;SOLUTION: The composite metal oxide contains Ce (cerium) and Nb (niobium) and the composite metal oxide essentially comprises a cerium niobium double oxide represented by compositional formula of CeNbOx, where x represents a number of 4.03 or more and 4.30 or less. In an X-ray diffraction pattern using CuKα line obtained by X-ray diffraction measurement of the composite metal oxide, a ratio (A/B) is 0.5 or more, which is a ratio of the total peak area (A) of diffraction peaks of the cerium niobium double oxide present in a region where 2θ is 25.0 to 30.0° to the total peak area (B) of diffraction peaks present in the above region; and the composite metal oxide has a BET specific surface area of 10 m²/g or more.;SELECTED DRAWING: None;COPYRIGHT: (C)2016,JPO&INPIT