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Method for preparing nano-cerium rare earth composite oxide

A rare earth composite and oxide technology, applied in rare earth metal oxide/hydroxide, rare earth metal compound, nanostructure manufacturing, etc., can solve the problems of small particle size, high sintering activity, small grain size, etc. Small, good dispersion, consistent appearance

Inactive Publication Date: 2017-06-27
GUANGDONG INST OF RARE METALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The method overcomes the shortcomings of the coprecipitation method that usually uses water as a solvent and inorganic alkali or inorganic salt as a precipitant, which is prone to uneven precipitation, easy agglomeration, and requires special drying methods and equipment. The prepared zirconia, Cerium oxide nanopowder materials have the advantages of small grain size (primary grain size is 6-20nm), small particle size, narrow particle size distribution (particle size distribution is 50-150nm), no hard agglomeration, and high sintering activity; However, this method is complex and expensive

Method used

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  • Method for preparing nano-cerium rare earth composite oxide
  • Method for preparing nano-cerium rare earth composite oxide
  • Method for preparing nano-cerium rare earth composite oxide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Ce 0.8 Sm 0.2 O 1.9 Preparation.

[0025] Using pure water as the solvent and the molar ratio of 4:1 to prepare 40L of a mixed solution of cerium chloride and samarium chloride with a total rare earth metal ion concentration of 0.35mol / L, add 36.2g of anti-agglomeration reagent ammonium chloride; with pure water As the solvent, prepare 30L of ammonium bicarbonate solution with an ion concentration of 2.0mol / L, add 254 grams of polyethylene glycol with a molecular weight of 2000:10000=1:1, and add the above ammonium bicarbonate solution under constant stirring Into the mixed solution of cerium chloride and samarium chloride to obtain a suspension, continue to stir for 15 minutes, let stand for 30 minutes, and then vacuum filter to obtain a precipitate of cerium and samarium carbonate complex, which is treated with ethanol for 3 times to obtain The cerium-samarium carbonate composite was vacuum dried at 120°C for 4 hours and calcined at 1050°C for 4 hours to obtain nano-ceri...

Embodiment 2

[0028] Ce 0.85 La 0.15 O 1.925 Preparation.

[0029] Using pure water as the solvent and the molar ratio of 85:15 to prepare 40L of a mixed solution of cerium chloride and lanthanum chloride with a total rare earth metal ion concentration of 0.25mol / L, add 25.6 grams of ammonium chloride; use pure water as Solvent, prepare 30L of ammonium bicarbonate solution with ion concentration of 2.0mol / L, add 180 grams of polyethylene glycol with molecular weight 4000:8000=1:1, under constant stirring, add the above ammonium bicarbonate mixed solution to the chlorination In the mixed solution of cerium and lanthanum chloride, a suspension is obtained; stirring is continued for 20 minutes, standing and aging for 40 minutes, and then vacuum filtration is performed to obtain the precipitate of the cerium lanthanum carbonate composite, which is treated with n-butanol for 5 times to obtain The cerium lanthanum carbonate composite was vacuum dried at 120°C for 4 hours and calcined at 750°C for 4 ...

Embodiment 3

[0032] Nano Ce 0.8 Y 0.2 0 1.9 Preparation.

[0033] Using pure water as the solvent and the molar ratio of 4:1 to prepare 40L of a mixed solution of cerium chloride and yttrium chloride with a total rare earth metal ion concentration of 0.35mol / L, add 33.6g of ammonium chloride; use pure water as Solvent, prepare 30L of ammonium bicarbonate solution with ion concentration of 2.0mol / L, add 236 grams of polyethylene glycol with a molecular weight of 2000:8000=1:1, under constant stirring, add the above ammonium bicarbonate solution to cerium chloride and In the mixed solution of yttrium chloride, a suspension is obtained; stirring is continued for 25 minutes, standing and aging for 50 minutes, and then vacuum filtration is performed to obtain a precipitate of cerium and yttrium carbonate complex, which is treated with isopropanol for 6 times to obtain cerium carbonate The yttrium composite was vacuum dried at 120°C for 4 hours and calcined at 950°C for 4 hours to obtain nano-ceriu...

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Abstract

The invention provides a method for preparing the nano-cerium rare earth composite oxide. The method comprises the steps that anti-reunion reagent ammonium chloride is added in a rare earth chloride solution with the total rare earth metal ion concentration being 0.2-0.4 mol / L; surfactant is added in an ammonium bicarbonate solution; the ammonium bicarbonate solution is added to the rare earth chloride solution by constantly stirring, to obtain a suspension liquid; the suspension liquid continues to be stirred for 10-30 minutes, then standing and aging for 30-60 minutes; carbonic acid rare earth compound is filtered, then washed with pure water, then treated with surface conditioning liquid for 3-6 times; the carbonic acid rare earth compound is dried for 4 hours at 120 DEG C; the carbonic acid rare earth compound is burned for 4 hours under 700-1100 DEG C to obtain the nano-cerium rare earth composite oxide. The method for preparing the nano-cerium rare earth composite oxide is simple and low in cost, reduces the level of aggregation of powder, the obtained nano-powder material granularity is small in size, consistent in morphology, and narrow in particle size distribution.

Description

Technical field [0001] The invention relates to a method for preparing nano oxide powder, in particular to a method for preparing nano cerium-based rare earth composite oxide powder. Background technique [0002] In recent years, with the development of the fuel cell industry, the preparation of a new type of high-efficiency electrolyte material that can thin the electrolyte layer, increase the conductivity of ions at medium and low temperatures, and reduce the operating temperature of nano-cerium-based rare earth composite oxides has also increased. People pay more attention. At present, the methods for preparing nano-cerium-based rare earth composite oxides mainly include precipitation method, alkoxide hydrolysis method, sol-gel method, hydrothermal method, etc. Among them, the precipitation method has the advantages of precise control of the content of each component, low cost, and simple process. , Easy to scale production and other advantages have been extensively studied....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B82B3/00C01F17/00B82Y40/00
CPCB82B3/0095B82Y40/00C01F17/206C01P2002/72C01P2004/03C01P2004/64C01P2004/82C01P2006/12
Inventor 李杏英刘志强曹洪杨雷一锋金明亚陶进长朱薇郭秋松李伟高远张魁芳
Owner GUANGDONG INST OF RARE METALS