IRON OXIDE-ZIRCONIA COMPOSITE OXIDE AND METHOD FOR PRODUCING SAME, AND EXHAUST GAS PURIFICATION CATALYST
    10.
    发明申请
    IRON OXIDE-ZIRCONIA COMPOSITE OXIDE AND METHOD FOR PRODUCING SAME, AND EXHAUST GAS PURIFICATION CATALYST 有权
    氧化铁 - 氧化锆氧化物及其制造方法和排气净化催化剂

    公开(公告)号:US20150080211A1

    公开(公告)日:2015-03-19

    申请号:US14384283

    申请日:2013-04-26

    摘要: A composite oxide with a high oxygen storage capacity is provided without using cerium. The composite oxide is an iron oxide-zirconia composite oxide containing iron, zirconium, and a rare-earth element. The total content of Fe2O3, ZrO2, and an oxide of the rare-earth element is not less than 90 mass %, the content of an iron oxide in terms of Fe2O3 is 10 to 90 mass %, and the absolute value of the covariance COV(Fe, Zr+X) of the composite oxide, which has been baked in the atmosphere at a temperature of greater than or equal to 900° C. for 5 hours or more, determined by the following Formulae (1) to (3), is not greater than 20:  [ Math .  1 ]  R i  ( Fe ) = I i  ( Fe ) × 100 I i  ( Fe ) + I i  ( Zr ) + I i  ( X ) ( 1 )  R i  ( Zr + X ) = { I i  ( Zr ) + I i  ( X ) } × 100 I i  ( Fe ) + I i  ( Zr ) + I i  ( X ) ( 2 ) COV  ( Fe , Zr + X ) = 1 n  ∑ i = 1 n   [ { R i  ( Fe ) - R av  ( Fe ) } × { R i  ( Zr + X ) - R av  ( Zr + X ) } ] ( 3 ) (in the formula, Ii(Fe), Ii(Zr), and Ii(X) respectively represent the ratios of the X-ray intensities of iron, zirconium, and the rare-earth element measured at a measurement point i (where i=1 to n) to the 100% intensities of the respective elements as measured by subjecting the composite oxide to a ray analysis through EPMA (WDX: wavelength dispersive X-ray spectrometry), where Rav(Fe) and Rav(Zr+X) represent the mean values of Ri(Fe) and Ri(Zr+X), respectively, at all measurement points n).

    摘要翻译: 提供具有高储氧能力的复合氧化物,而不使用铈。 复合氧化物是含有铁,锆和稀土元素的氧化铁 - 氧化锆复合氧化物。 Fe2O3,ZrO2和稀土类元素的氧化物的总含量为90质量%以上,Fe 2 O 3的氧化铁含量为10〜90质量%,协方差COV的绝对值 (1)〜(3)确定的复合氧化物的(Fe,Zr + X),其在大气中在大于或等于900℃的温度下烘烤5小时以上, ,不大于20: (Fe)= I(Fe)×100 I i(Fe)+ I(Zr)+ I(X)(1)R i(Zr + X )(I)(X)(X)(2)COV(Fe,Zr + X) )= 1 nΣi = 1 n[{R i(Fe)-R av(Fe)}×{R i(Zr + X)-R av(Zr + X)}] 3)(式中,Ii(Fe),Ii(Zr)和Ii(X)分别表示在测量点i测量的铁,锆和稀土元素的X射线强度的比例 其中i = 1至n)相对于通过EPMA(WDX:波长色散X射线光谱法)对复合氧化物进行射线分析测量的各元素的100%强度,其中Rav(Fe)和Rav(Zr + X)分别表示在所有测量点n处的Ri(Fe)和Ri(Zr + X)的平均值。