Method for preparing high specific surface metal oxide

A high specific surface, metal compound technology, applied in chemical instruments and methods, catalyst activation/preparation, chemical/physical processes, etc., can solve the problems of generating a large amount of waste, difficult conditions to control, long time, etc., to achieve waste generation The effect of less amount, easy control of conditions, and short preparation cycle

Inactive Publication Date: 2004-09-15
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Claims
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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

Method used

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  • Method for preparing high specific surface metal oxide
  • Method for preparing high specific surface metal oxide
  • Method for preparing high specific surface metal oxide

Examples

Experimental program
Comparison scheme
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Example Embodiment

[0014] Example 1 CeO 2 Preparation of precursor

[0015] The cerium nitrate is dissolved in water to prepare an immersion solution, and the activated carbon carrier is added for immersion for 0.1-10 hours. The surface area of ​​activated carbon is 100-3000m 2 / g. Evaporate the solution with stirring, and then bake at 100-120℃ for 10-24 hours to obtain CeO 2 . CeO 2 The weight percentage of the load is in the range of 1-200%.

Example Embodiment

[0016] Example 2 ZrO 2 Preparation of precursor

[0017] Dissolve zirconium nitrate or zirconium oxychloride in water to prepare an immersion solution, add activated carbon carrier and immerse for 0.1-10 hours. The surface area of ​​activated carbon is 100-3000m 2 / g. The solution is evaporated under stirring, and then baked at 100-120℃ for 10-24 hours to obtain ZrO 2 Precursor. ZrO 2 The weight percentage of the load is in the range of 1-200%.

Example Embodiment

[0018] Example 3 Ce x Zr 1-x O 2 Preparation of solid solution precursor

[0019] Dissolve cerium nitrate and zirconium salts (such as zirconium nitrate, zirconium oxychloride, etc.) in water to form a solution, and then add the activated carbon carrier described in Example 1 to soak for 0.1-10 hours, and then steam the solution under stirring, and then add it to 100-120 Bake at ℃ for 10-24 hours to get Ce x Zr 1-x O 2 Solid solution precursor. Ce x Zr 1-x O 2 The weight percentage of the load is in the range of 1-200%.

[0020] Ce x Zr 1-x O 2 The solid solution precursor can also be impregnated in stages, that is, first impregnating cerium nitrate and then zirconium salt, or impregnating zirconium salt and then cerium nitrate. After each step of immersion, the solution should be evaporated under stirring, and then baked at 100-120℃ for 10-24 hours, and finally Ce x Zr 1-x O 2 Solid solution precursor.

[0021] By changing the amount of cerium nitrate and zirconium salt added, Ce...

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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...

Claims

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Application Information

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IPC IPC(8): B01J37/02B01J37/12
Inventor 梁长海李灿李忠来
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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