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High temperature resistant and high specific surface area cerium dioxide (CeO2), preparation method and application thereof

A technology with high specific surface area and high temperature resistance, applied in the fields of nanotechnology, chemical instruments and methods, and inorganic chemistry for materials and surface science, it can solve the problems of decreased catalytic activity, decreased specific surface area, etc., and achieves narrow pore size distribution, The effect of high temperature resistance specific surface area

Inactive Publication Date: 2013-03-27
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This enhances the thermal stability of the carrier to a certain extent, but still cannot meet the requirements, and the addition of ZrO 2 Catalytic activity decreased after
Many current studies on CeO 2 Most of the patents focus on increasing the specific surface area, although their specific surface area can reach 200m at normal temperature or low temperature 2 / g or more, but at 800°C and above, their specific surface area will drop sharply

Method used

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  • High temperature resistant and high specific surface area cerium dioxide (CeO2), preparation method and application thereof
  • High temperature resistant and high specific surface area cerium dioxide (CeO2), preparation method and application thereof
  • High temperature resistant and high specific surface area cerium dioxide (CeO2), preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Weigh 3.73g of CeCl 3 ·7H 2 O, 3.64g of cetyltrimethylammonium bromide (CTAB) were dissolved in deionized water respectively, and water was added to 140ml, and concentrated ammonia water (25wt%) was slowly added dropwise to the mixed solution until the pH value was about Above 12, stir for about 2 hours, seal, heat in a constant temperature oil bath (90°C), and continue stirring for four days. Naturally cool to room temperature, filter the precipitate, wash with a large amount of water 4 to 5 times, and then wash with ethanol or acetone 2 to 3 times. Place it in a vacuum oven at 70°C for about 12 hours. Then the sample was baked in air at 800°C for 4 hours, the heating rate was 2°C / min, and cooled to room temperature to obtain high temperature resistant, high specific surface area and mesoporous nanostructure ceria.

Embodiment 2

[0020] Weigh 4.46g of CeCl 3 ·7H 2 0.3.64g of cetyltrimethylammonium bromide (CTAB) were dissolved in deionized water respectively, and added to 140ml, and concentrated ammonia water (25wt%) was slowly added dropwise to the mixed solution until the pH value was about If it is above 12, stir for another 2 hours, seal the constant temperature oil bath (90°C) and continue stirring for four days. Naturally cool to room temperature, filter the precipitate, wash with a large amount of water 4 to 5 times, and then wash with ethanol or acetone 2 to 3 times. Place it in a vacuum oven at 70°C for about 12 hours. Then the sample was baked in air at 800°C for 4 hours, the heating rate was 2°C / min, and cooled to room temperature, then high temperature resistant, high specific surface area and mesoporous nanostructure cerium oxide was obtained.

[0021] BET, XRD, BJH, N of the product of embodiment 1 and embodiment 2 2 Adsorption-desorption analysis results are shown in Table 1 and Fig...

Embodiment 3

[0023] Weigh 4.34g of Ce(NO 3 ) 3 ·6H 2 0, 3.64g of cetyltrimethylammonium bromide (CTAB) was dissolved in deionized water respectively, and added to 140ml, and concentrated ammonia water (25wt%) was slowly added dropwise to the mixed solution until the pH value was about If it is above 12, stir for another 2 hours, seal the constant temperature oil bath (90°C) and continue stirring for four days. Naturally cool to room temperature, filter the precipitate, wash with a large amount of water 4 to 5 times, and then wash with ethanol or acetone 2 to 3 times. Place it in a vacuum oven at 70°C for about 12 hours. Then the sample was baked in air at 800°C for 4 hours, the heating rate was 2°C / min, and cooled to room temperature to obtain high temperature resistant, high specific surface area and mesoporous nanostructure ceria. The BET results are shown in Table 1.

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Abstract

The invention discloses a high temperature resistant and high specific surface area cerium dioxide with a mesoporous nano-structure, of which the crystalline grain is lower than 20nm after being sintered at 800 DEG C, the specific surface area is greater than 100m<2> / g and the pore volume is greater than 0.7cm<3> / g, wherein these parameters are remarkably superior to related parameters of the known cerium dioxide. The high temperature resistant and high specific surface area CeO2 disclosed by the invention has the characteristics that the produced sample has high specific surface area and narrow pore diameter distribution at high temperature, and is applicable to a carrier of an automobile tail gas three-way catalyst. Furthermore, the invention discloses a preparation method of the high temperature resistant and high specific surface area CeO2.

Description

technical field [0001] The invention relates to a nano-rare earth catalytic material with high temperature resistance and high specific surface area, which is suitable for preparing a catalyst for purifying and treating automobile tail gas. Background technique [0002] Automobile exhaust is one of the main sources of air pollution. With the enhancement of people's awareness of environmental protection, international and domestic requirements for automobile exhaust emission standards are getting higher and higher. Ceria (CeO 2 ) is a very important rare earth transition metal oxide functional material, due to its Ce 3+ / C 4+ It is easy to reversible conversion, has good oxygen storage and release capacity, and is beneficial to adjust the oxygen balance of automobiles under rich-burn and lean-burn conditions, so it is widely used as a catalyst for automobile exhaust purification. Usually Pt, Pd, Rh are loaded on CeO 2 on, and coated on the surface of honeycomb ceramics to...

Claims

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Application Information

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IPC IPC(8): C01F17/00B82Y30/00B01J32/00B01J35/10
Inventor 董林伍士国汤常金高飞
Owner NANJING UNIV