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AssigneeHanwha Chemical Corporation
InventorsWan Jae Myeong, Joo Hyeong Lee, Kyu Ho Song, Young Sik Hahn
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The present invention relates to a method for preparing a metal oxide containing precious metals, which can be used for a catalyst for purifying automobile exhaust gases and has excellent heat resistance and, more particularly, to a method for preparing a metal oxide containing precious metals including the step of continuously reacting a reaction mixture, including (i) water, (ii) a water-soluble precious metal compound, (iii) a water-soluble cerium compound and (iv) at least one water-soluble metal compound selected from the group consisting of a zirconium compound, a scandium compound, a yttrium compound and a lanthanide metal compound other than a cerium compound, at a temperature from 2000 C to 700° C. and at a pressure from 180 bar to 550 bar, wherein the molar ratio of precious metal to metal other than the precious metal in a reaction product is in the range from 0.001 to 0.1.
A method for preparing a metal oxide containing precious metals, comprising the step of continuously reacting a reaction mixture, comprising (i) water, (ii) a water-soluble precious metal compound, (iii) a water-soluble cerium compound and (iv) at least one water-soluble metal compound selected from a group consisting of a zirconium compound, a scandium compound, a yttrium compound and a lanthanide metal compound other than a cerium compound, at a temperature from 200° C. to 700° C. and at a pressure of 180 bar to 550 bar, wherein
Dependencies are inferred from the claim text.