A kind of preparation method of rare earth compound

A compound, rare earth technology, applied in chemical instruments and methods, chemical/physical processes, physical/chemical process catalysts, etc., can solve problems such as stability, oxygen storage capacity and insufficient catalytic activity, and achieve low cost and raw material sources. wide range of effects

Inactive Publication Date: 2018-06-29
云南铑熠金属材料有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of this method is that there is no doping of rare earth elements, and the stability, oxygen storage capacity and catalytic activity are insufficient.

Method used

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  • A kind of preparation method of rare earth compound
  • A kind of preparation method of rare earth compound

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] The present embodiment rare earth complex Ce 0.3 Zr 0.4 La 0.3 o 2 The preparation method specifically comprises the following steps:

[0032] (1) Configure the precursor solution: add 0.3mol of Ce(NO 3 ) 3 ·6H 2 O, 0.4mol of Zr(CH 3 COO) 4 and 0.3molLa(NO 3 ) 3 ·6H 2 O was dissolved in 1 L of water to prepare the precursor solution.

[0033] (2) Adsorption: Add activated carbon (particle size: 400 mesh, specific surface area: 1350㎡ / g) to the precursor solution according to the liquid-solid ratio of 2:1 to adsorb the rare earth ions in the precursor solution, and the adsorption time for 2h.

[0034] (3) Precipitation: Slowly add ammonia water with an ammonia content of 10% to the precursor solution treated in step (2) for precipitation. During the precipitation process, the pH of the solution is controlled to be 8, and the temperature of the solution is 70°C.

[0035] (4) After the precipitation is completed, age at 70°C for 4 hours, then filter, and wash t...

Embodiment 2

[0039] The present embodiment rare earth complex Ce 0.1 Zr 0.5 Yb 0.4 o 2 The preparation method specifically comprises the following steps:

[0040] (1) Configure the precursor solution: add 0.1mol of Ce(NO 3 ) 3 ·6H 2 O, 0.5mol of Zr(CH 3 COO) 4 and 0.4mol of Yb(NO 3 ) 3 ·6H 2 O was dissolved in 1 L of water to prepare the precursor solution.

[0041] (2) Adsorption: Add activated carbon (350 mesh particle size, 1460㎡ / g specific surface area) to the precursor solution at a liquid-solid ratio of 3:1 to adsorb the rare earth ions in the precursor solution, and the adsorption time It is 2.5h.

[0042] (3) Precipitation: Slowly add ammonia water with an ammonia content of 20% to the precursor solution treated in step (2) for precipitation. During the precipitation process, the pH of the solution is controlled to be 10, and the temperature of the solution is 60°C.

[0043] (4) After the precipitation is completed, age at 60°C for 4 hours, then filter, and wash the pr...

Embodiment 3

[0047] The present embodiment rare earth complex Ce 0.4 Zr 0.2 La 0. 2 Yb 0.2 o 2 The preparation method specifically comprises the following steps:

[0048] (1) Configure the precursor solution: add 0.4mol of Ce(NO 3 ) 3 ·6H 2 O, 0.2mol of Zr(CH 3 COO) 4 and 0.2mol of La(NO 3 ) 3 ·6H 2 O 0.2mol of Yb(NO 3 ) 3 ·6H 2 O was dissolved in 1 L of water to prepare the precursor solution.

[0049] (2) Adsorption: Add activated carbon (390 mesh particle size, 1560㎡ / g specific surface area) to the precursor solution at a liquid-solid ratio of 4:1 to adsorb rare earth ions in the precursor solution, and the adsorption time for 3h.

[0050] (3) Precipitation: Slowly add ammonia water with an ammonia content of 25% to the precursor solution treated in step (2) for precipitation. During the precipitation process, the pH of the solution is controlled to be 9, and the temperature of the solution is 65°C.

[0051] (4) After the precipitation is completed, age at 75°C for 3.5 ...

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Abstract

The invention discloses a preparing method for rare earth compounds and belongs to the technical field of preparation of inorganic composite materials. The method comprises the steps that Ce, Zr, La, Pr, Nd, Yb and other compounds are selected as precursors, and a ternary rare earth compound, a quaternary rare earth compound and a polynary rare earth compound are prepared respectively; powdery porous activated carbon is arranged in corresponding precursor solutions, then stirring is carried out, a precipitator is added after adsorption is conducted for a certain time to precipitate the mixture, the pH value is adjusted to be proper, aging is conducted after complete precipitation, and the mixture is filtered, washed, dried and them roasted at a high temperature. The rare earth compounds prepared through the method have the advantages of being large in specific surface area, high in OSC and the like; TEM representation shows that the compounds are nanoparticles with the particle size ranging from 9 nm to 20 nm. The compounds prepared through the method can be widely applied to the fields of petroleum, chemical industry, environmental protection and the like.

Description

technical field [0001] The invention relates to a preparation method of a rare earth compound, belonging to the technical field of preparation of inorganic composite materials. Background technique [0002] With the rapid development of the economy, energy shortages and environmental problems are becoming more and more serious. Automobile exhaust is one of the main sources of urban environmental pollution. The control of automobile exhaust is an important measure to ensure environmental quality. With the gradual improvement of automobile exhaust emission standards, there is a greater need for high-performance automobile exhaust catalysts, and cerium-zirconium composites are high-temperature stable materials. Ce specific to cerium ions in cerium oxide 3+ / C 4+ The oxidation-reduction cycle makes it an important component in the three-way catalyst for automobile exhaust purification. In depleted oxygen, CeO 2 Oxygen is released to provide the oxygen required for the oxidat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/10B82Y30/00B82Y40/00
Inventor 张慧颖张冰段德良杨辅龙李正国陈渝陈召光龙文凯陈永雄陈春孝
Owner 云南铑熠金属材料有限公司
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