| abstract |
Disclosed is alumina having a water desorption index H (=(V d0.5 -V a0.5 )÷V a0.9 ) of 0.15 or less in a water adsorption/desorption isotherm at 25° C., where V d0.5 represents a water adsorption amount [mg/g] per 1 g of alumina in the desorption isotherm at a relative water vapor pressure of 0.5, V a0.5 represents a water adsorption amount [mg/g] per 1 g of alumina in the adsorption isotherm at a relative water vapor pressure of 0.5, and V a0.9 represents a water adsorption amount [mg/g] per 1 g of alumina in the adsorption isotherm at a relative water vapor pressure of 0.9. |