COMPLEX OXIDE, METHOD FOR PRODUCING SAME, AND EXHAUST GAS PURIFICATION CATALYST

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Provided are : a complex oxide that exhibits high redox ability even at low temperatures, has superior heat resistance, and stably maintains the characteristics thereof even after repeating oxidation/reduction at a high temperature; a method for producing the complex oxide; and an exhaust gas purification catalyst. The complex oxide contains : Ce; a rare earth metal element including Y but not including Ce; Al and/or Zr; and Si; and contains Ce and the other elements aside from Ce and Si at a mass ratio in terms of the oxide in the range of 85 : 15-99 : 1, and performing temperature-programmed reduction (TPR) measurement from 50°C to 900°C at a rate of temperature rise of 10°C/minute in a 10% hydrogen, 90% argon atmosphere and then performing oxidation processing for 0.5 hours at 500°C, has the characteristic of exhibiting a reduction rate of at least 2.0% at 400°C or lower calculated from the result of performing TPR measurement again.