[N+:1]([O-:4])([O-:3])=[O:2].[Mg+2:5].[N+:6]([O-:9])([O-:8])=[O:7].[N+:10]([O-:13])([OH:12])=[O:11].O.O.O.O.O.O.O.O.O.[N+:23]([O-:26])([O-:25])=[O:24].[Al+3:27].[N+:28]([O-:31])([O-:30])=[O:29].[N+]([O-])([O-])=O>O>[N+:1]([O-:4])([O-:3])=[O:2].[Al+3:27].[N+:6]([O-:9])([O-:8])=[O:7].[N+:10]([O-:13])([O-:12])=[O:11].[N+:23]([O-:26])([O-:25])=[O:24].[Mg+2:5].[N+:28]([O-:31])([O-:30])=[O:29]An aqueous solution in which 3.75 kg of aluminum nitrate nonahydrate, 2.56 kg of magnesium nitrate and 540 g of 60% nitric acid were dissolved in 5.0 L of pure water was gradually dropped into 20.0 kg of a stirred silica sol solution having a colloidal particle diameter of from 10 to 20 nm held at 15° C. (Snowtex N-30 manufactured by Nissan Chemical Industries, Ltd. (SiO2 content: 30% by mass)) to obtain a mixed slurry of silica sol, aluminum nitrate and magnesium nitrate. Subsequently, the mixed slurry was aged by holding at 50° C. for 24 hours. After cooling to room temperature, the mixed slurry was spray-dried with a spray dryer set to an outlet temperature of 130° C. to obtain a solid.
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