| abstract |
The present invention provides an alumina-based composite oxide having a large initial specific surface area, a small initial average pore diameter, and excellent heat resistance of the specific surface area and pore volume, and a method for producing the same. Specifically, the present invention is an alumina-based composite oxide having an initial crystallite diameter of 10 nm or less and an initial specific surface area of 80 m 2 / ml or more, and after firing at 1200 ° C. for 3 hours in the atmosphere. The specific surface area is 10 m 2 / ml or more, and the initial average pore diameter is 10 nm to 50 nm, The initial pore volume is P 0 ml / g, and the pore volume after calcination for 3 hours at 1200 ° C. in the atmosphere P 1 ml / g, and represented by (P 1 / P 0 ) × 100, wherein the retention ratio of pore volume after calcination at 1200 ° C. in the atmosphere for 3 hours is 10% or more. An alumina-based composite oxide is provided. |