Method for preparing high specific surface metal oxide

Abstract

The invention relates to a method to prepare high specific surface metal oxides, like the Ce-containing solid solutions of CeO2, ZrO2, CexZr1-xO2, etc. Firstly, it loads metal combination or mixture of the metal combination onto the carbon material by dipping to obtain the fore body, where the carried quantity of the oxide is 1-200% of the weight of the carbon material; then, raises the temperature of the fore body to 450-950 deg.C at the atmosphere of air or 5-20vol.% oxygen at a heating speed of 1-20 deg.C / min, makes constant temperature oxidization for 0.1-10 hours and then lowers the temperature to room temperature, so as to obtain it.

Description

technical field [0001] The present invention relates to high specific surface metal oxides such as CeO 2 , ZrO 2 and Ce x Zr 1-x o 2 The preparation of cerium-containing solid solution is specifically a method for preparing a metal oxide with a high specific surface area. Background technique [0002] Catalytic materials are at the heart of catalytic science and technology. The preparation of large specific surface catalytic materials has always been the focus of research on the preparation of catalytic materials. CeO 2 , ZrO 2 and Ce x Zr 1-x o 2 Cerium-containing solid solutions and other materials are widely used in environmental catalysis such as three-way catalysts for automobile exhaust treatment, catalytic combustion catalysts, and fuel cell catalysts due to their unique catalytic properties; CeO obtained by traditional high-temperature roasting methods 2 , ZrO 2 and Ce x Zr 1-x o 2 Cerium-containing solid solution materials have a lower specific surfac...

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Problems solved by technology

However, the above methods generally have the following disadvantages: the preparation process has many steps, a large amount of waste is generated, and the conditions are difficult to control, especially for high-surface catalytic materials, it takes a long time and is expensive

For example, in the US patent (USP 6 255 242), Ce was prepared by using a mixed solution of zirconium sulfate and cerium-containing ions and alkali coprecipitation x Zr 1-x o 2 Solid solution; U.S. Patent (USP 6 133 194) adopts the method of adding surfactant to improve Ce x Zr 1-x o 2 The surface area of ​​a solid solution; its disadvantages are the generation of a large amount of waste, many steps, difficult conditions to control, and a long time, etc.

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