Complex oxide particles and catalyst for purifying exhaust gas using same
A technology of composite oxides and oxides, applied in metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, catalyst activation/preparation, etc., can solve the problem of reduced reduction characteristics and heat resistance of oxygen storage materials And problems such as insufficient oxygen storage capacity and reduced durability
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Embodiment 1
[0048] Aluminum nitrate nonahydrate, zirconyl nitrate dihydrate, cerium nitrate hexahydrate, lanthanum nitrate hexahydrate, and yttrium nitrate hexahydrate were added to ion-exchange water and mixed so that the composition shown in Table 1 was obtained. . A raw material solution was obtained by adding and stirring a hydrogen peroxide aqueous solution (hydrogen peroxide solution) in an amount 1.2 times the molar amount of cerium in cerium nitrate. Keep the stock solution above pH 9 and add to the NH 3 Each component was co-precipitated in an aqueous solution (1.2 times or more of the neutralization equivalent to the metal cation), and a complex oxide precursor was obtained. The obtained composite oxide precursor was centrifuged and washed sufficiently, then dried in air at 150°C for 7 hours, and calcined at 330°C for 5 hours. The obtained molded product was pulverized with a pulverizer, and fired at 700° C. for 5 hours in the air to obtain composite oxide particles.
[0049]...
Embodiment 2～6
[0051] Except that the amounts of aluminum nitrate nonahydrate, zirconyl nitrate dihydrate, cerium nitrate hexahydrate, lanthanum nitrate hexahydrate, and yttrium nitrate were mixed so as to have the composition described in Table 1, it was the same as in Example 1. By doing this, composite oxide particles and a catalyst for exhaust gas purification were obtained.
Embodiment 7
[0073] (Preparation of material A)
[0074] After dissolving aluminum nitrate nonahydrate in ion-exchanged water, zirconium oxynitrate dihydrate, cerium nitrate hexahydrate, lanthanum nitrate hexahydrate, and yttrium nitrate hexahydrate were added so as to have the composition shown in Table 3. to mix. A raw material solution was obtained by adding and stirring an aqueous hydrogen peroxide solution in an amount 1.2 times the molar amount of cerium in cerium nitrate. Keep the stock solution above pH 9, and add NH 3 Each component was co-precipitated in an aqueous solution (1.2 times or more of the neutralization equivalent to the metal cation), and a complex oxide precursor was obtained. The obtained composite oxide precursor was centrifuged and washed sufficiently, then dried in air at 150° C. for 7 hours, and calcined at 330° C. for 5 hours. The obtained molded product was pulverized with a pulverizer, and then fired at 700° C. for 5 hours in the air to obtain composite ox...
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