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Preparation method of cerium oxide with specific mixed valence state

A mixed valence state, cerium oxide technology, applied in the preparation/treatment of rare earth metal compounds, cerium oxide/cerium hydroxide, rare earth metal oxide/hydroxide, etc., can solve the problem of narrow width and achieve grain size Small, good UV shielding effect, wide wavelength UV shielding effect effect

Active Publication Date: 2021-01-08
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Conventional cerium oxide powder has an ultraviolet shielding effect, the absorption limit is about 350nm, and the width of the absorption wavelength is narrow

Method used

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  • Preparation method of cerium oxide with specific mixed valence state
  • Preparation method of cerium oxide with specific mixed valence state
  • Preparation method of cerium oxide with specific mixed valence state

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preparation example Construction

[0033] The invention provides a method for preparing cerium oxide in a specific mixed valence state, comprising the following steps:

[0034] (1) Under the condition that the temperature of the aqueous solution of trivalent cerium salt is 20-50°C and stirring continuously, the complexing agent and the templating agent are successively added into the aqueous solution of trivalent cerium salt with a peristaltic pump to obtain a mixed solution; The pump adds a pH regulator to the mixed solution until the pH of the mixed solution is 2 to 6; among them, the complexing agent and Ce 3+ The molar ratio of the template agent to Ce is 0.3 to 3:1. 3+ The molar ratio is 0.01~1:1;

[0035] (2) After the mixed solution is adjusted to the specified pH, continue stirring for 10-60 minutes, filter and dry to obtain the precursor of cerium oxide powder;

[0036] (3) Roast the precursor of cerium oxide powder in a spray roaster at 200-500° C. in a spray roaster, and cool the roasted product to...

Embodiment 1

[0043] Under the condition that the temperature of cerium chloride aqueous solution is 20°C and stirring continuously, the citric acid solution with a concentration of 3 mol / L and the glucose solution with a concentration of 3 mol / L are successively added chlorine with a concentration of 0.5 mol / L cerium ion by a peristaltic pump. cerium oxide aqueous solution to obtain a mixed solution; then, a peristaltic pump was used to add a sodium hydroxide solution with a concentration of 10 mol / L to the above mixed solution until the pH value of the mixed solution was 6. Among them, citric acid and Ce 3+ The molar ratio of glucose to Ce is 0.3:1 3+ The molar ratio is 0.01:1.

[0044] After the mixed solution was adjusted to a pH of 6, the stirring was continued for 10 minutes, filtered and then dried to obtain a precursor of cerium oxide powder.

[0045] The precursor of cerium oxide powder is roasted at 500°C by spray roasting in a spray roaster, and the roasted product is cooled to...

Embodiment 2

[0048] Under the condition that the temperature of cerium nitrate aqueous solution is 50°C and it is constantly stirred, EDTA solution with a concentration of 0.05 mol / L and a solution of polyethylene glycol with a concentration of 0.05 mol / L are successively added to the cerium ion concentration of 0.5 mol with a peristaltic pump. / L of cerium nitrate aqueous solution to obtain a mixed solution; Among them, EDTA and Ce 3+ The molar ratio of polyethylene glycol to Ce is 3:1. 3+ The molar ratio is 1:1.

[0049] After the mixed solution was adjusted to a pH of 2, the stirring was continued for 60 minutes, filtered and then dried to obtain a precursor of cerium oxide powder.

[0050] The precursor of cerium oxide powder is roasted at 200°C by spray roasting in a spray roaster, and the roasted product is cooled to room temperature with inert gas at the product collection point of the spray roaster to obtain trivalent cerium quality The cerium oxide powder with a content of 60% ...

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Abstract

The invention belongs to the technical field of preparation of inorganic materials, and particularly relates to a preparation method of cerium oxide with a specific mixed valence state. The method comprises the following steps: (1) under the condition of continuous stirring, sequentially adding a complexing agent and a template agent into a trivalent cerium salt aqueous solution to obtain a mixedsolution; then adding a pH value regulator into the mixed solution until the pH value of the mixed solution is 2-6; (2) continuously stirring for 10-60 minutes, carrying out solid-liquid separation, and drying to obtain a precursor of cerium oxide powder; and (3) carrying out spray roasting on the precursor of the cerium oxide powder at 200-500 DEG C, and cooling the roasted product by adopting inert gas to obtain the cerium oxide powder of which the mass content of trivalent cerium is 60% and the mass content of tetravalent cerium is 40%. According to the method, cerium oxide with the specific mixed valence state can be prepared and has a relatively good ultraviolet shielding effect.

Description

technical field [0001] The invention belongs to the technical field of inorganic material preparation, and mainly relates to a preparation method of cerium oxide in a specific mixed valence state. Background technique [0002] Common oxides of cerium are cerium oxide (Ce 2 o 3 ) and ceria (CeO 2 ). Ce in ceria 4+ / C 3+ It has a small redox potential (1.3-1.8V), and can be converted under different redox atmospheres. For example, in a three-way catalytic system, ceria is used as an oxygen storage material to buffer the change of oxygen concentration, that is, it releases oxygen to increase the oxygen concentration under lean-burn conditions, and absorbs oxygen to reduce oxygen concentration under rich-burn conditions. oxygen concentration. In the actual catalytic reaction, the atmosphere where the catalyst is located will alternately change between excessive and insufficient oxygen concentration. In this case, ceria can be O 2 , NO and H 2 Absorb and store O in O 2 ...

Claims

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Application Information

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IPC IPC(8): C01F17/235C01F17/10B82Y40/00
CPCB82Y40/00C01P2004/64C01P2006/60C01F17/10C01F17/235
Inventor 边雪靳珣李艳平吴文远
Owner NORTHEASTERN UNIV
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