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Preparation method of high-performance cerium-zirconium solid solution material

A cerium-zirconium solid solution, high-performance technology, applied in separation methods, chemical instruments and methods, gas treatment, etc., can solve the problems of uneven crystal phase distribution, low catalytic activity, small specific surface area, etc. The effect of large surface area and simple preparation process

Active Publication Date: 2017-05-31
FUDAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the actual production process, the co-precipitation method is widely used because of its simple process and easy operation, but the cerium-based solid solution materials prepared by it usually have large grains and uneven crystal phase distribution, resulting in small specific surface area and low catalytic activity.

Method used

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  • Preparation method of high-performance cerium-zirconium solid solution material
  • Preparation method of high-performance cerium-zirconium solid solution material
  • Preparation method of high-performance cerium-zirconium solid solution material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Add 1.09g of cerium nitrate hexahydrate and 0.14g of anhydrous zirconium nitrate (4:1 molar ratio) into a beaker containing 100ml of deionized water, and add 5g of surfactant polyethylene glycol-200, and stir for 30min; Adopt the method of two-fluid spray, use compressed air as the gas component, set the air pressure to 0.4bar, feed rate to 0.01L / min, mix the ammonia solution with the concentration of 1.0mol / L with the above solution, and at the same time vigorously Stir to adjust the pH of the solution to about 10; after continuing to stir for 1 hour, transfer the mixed solution in the beaker to a 250ml stoppered flask, and put it into a constant temperature water bath at 60°C for hydrothermal aging treatment, and the treatment time is 4 hours; then filter and wash the precipitate with deionized water, dry the precipitate at 80°C for 6-8h; then roast the solid at 700°C in an air atmosphere for 4h with a heating rate of 5°C / min to obtain fresh cerium-zirconium Solid sol...

Embodiment 2

[0021] Add 1.37g of ceric ammonium nitrate and 0.58g of anhydrous zirconium nitrate (1:1 molar ratio) into a beaker containing 100ml of deionized water, and add 20g of surfactant polyethylene glycol-400, and stir for 30min; then use Two-fluid spray method, with compressed air as the gas component, set the air pressure to 0.4bar, and the feed rate to 0.01L / min, mix the ammonia solution with a concentration of 1.0mol / L with the above solution, and stir vigorously at the same time , adjust the pH of the solution to about 7; after continuing to stir for 1 hour, transfer the mixed solution in the beaker into a 250ml stoppered flask, and put it into a constant temperature water bath at 80°C for hydrothermal aging treatment, and the treatment time is 18 hours ; After that, filter and wash the precipitate with deionized water, dry the precipitate at 80°C for 6-8h; then roast the solid at 700°C in an air atmosphere for 4h, with a heating rate of 5°C / min, to obtain a fresh cerium-zirconi...

Embodiment 3

[0023] Add 0.18g of cerous chloride heptahydrate and 0.64g of zirconium oxychloride octahydrate (1:4 molar ratio) into a beaker containing 100ml of deionized water, and add 10g of surfactant dodecanoic acid, and stir for 30min; Then adopt the mode of two-fluid spray, with compressed air as the gas component, set the pressure of air as 0.6bar, feed rate as 0.1L / min, the ammonia solution with the concentration of 4.0mol / L is mixed with the above solution, and at the same time add Stir vigorously to adjust the pH of the solution to about 10; after continuing to stir for 1 hour, transfer the mixed solution in the beaker into a 250ml stoppered flask, and put it in a constant temperature water bath at 90°C for hydrothermal aging treatment. 24 hours; then filter and wash the precipitate with deionized water, dry the precipitate at 100°C for 6-8h; then roast the solid at 700°C in an air atmosphere for 4h with a heating rate of 5°C / min to obtain fresh cerium Zirconium solid solution sa...

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Abstract

The invention belongs to the technical field of preparation of solid materials and particularly relates to a preparation method of a high-performance cerium-zirconium solid solution material. The preparation method comprises the following steps: uniformly mixing metal cerium salt, metal zirconium salt and a surfactant by adopting a spray charging mode; inducing generation of a precipitation by adjusting the charging speed and using a crystal seed generated in the solution; finally, carrying out a hydrothermal aging and roasting process to obtain a cerium-zirconium composite material. According to the preparation method disclosed by the invention, the formation of the precipitation is induced by using tiny crystal seeds generated in an early-stage solution of the precipitation through the spray charging mode and control over the charging speed, so that the uniformity in a precipitating process is improved, and further the formation of a cerium-zirconium solid solution is promoted. The method has the advantages of simple preparation process and low production cost; the prepared cerium-zirconium solid solution has the characteristics of homogenized structure, small particle size, great specific surface area, good stability and the like; moreover, the high-performance cerium-zirconium solid solution material has excellent oxygen storing / discharging property and is the high-performance cerium-zirconium solid solution material with large-scale production and an industrial application prospect.

Description

technical field [0001] The invention belongs to the technical field of solid material preparation, and in particular relates to a preparation method of a high-performance cerium-zirconium solid solution material. Background technique [0002] The development of modern industrial technology has brought the automobile manufacturing industry into a new era, and automobiles have also become an important part of transportation in countries around the world. However, HC, CO and NO in automobile exhaust x It has become one of the main sources of air pollution. As people pay more and more attention to environmental protection, countries all over the world have stricter emission standards for vehicle exhaust. At present, the automobile exhaust gas treatment adopts the catalytic redox technology, and the ceramic honeycomb supported by noble metal is used as the catalyst. Among them, cerium oxide, as a rare earth oxide, has both +3-valent and +4-valent cerium ions in its fluorite cr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/10B01D53/94B01D53/72B01D53/62B01D53/56C01G25/00
CPCB01D53/945C01G25/00B01J23/10C01P2006/12B01D2258/01B01J35/613
Inventor 徐华龙黄镇沈伟黄亮赵培
Owner FUDAN UNIV
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