RARE EARTH MANGANESE/CERIUM-ZIRCONIUM-BASED COMPOSITE COMPOUND, PREPARATION METHOD THEREFOR AND APPLICATION THEREOF

摘要

A rare earth manganese/cerium-zirconium-based composite compound, a preparation method therefor and an application thereof. The composite compound has a core-shell structure, which is as represented by a general formula: ARE _cB _aO _b-(1-A)Ce _xZr _(1-x-y)M _yO _2-z, wherein 0.1≤A≤0.3, preferably 0.1≤A≤0.2. The main component of a shell is a rare earth manganese oxide, which is as represented by a general formula: RE _cMn _aO _b, wherein RE is a combination of one or more rare earth elements; B is Mn or a combination of Mn and a transition metal element; 1≤a≤8; 2≤b≤18; 0.25≤c≤4. The main component of a core is a cerium-zirconium composite oxide, which is as represented by a general formula: Ce _xZr _(1-x-y)M _yO _2-z, wherein M is one or more non-cerium rare earth elements; 0.1≤x≤0.9; 0≤y≤0.3; 0.01≤z≤0.3. The composite compound improves the oxygen storage capacity of a cerium-zirconium material by means of an interfacial effect so as to improve the conversion rate of a nitrogen oxide.