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Preparation method of cerium lanthanium complex oxide

A composite oxide, cerium lanthanum technology, applied in chemical instruments and methods, rare earth metal compounds, chemical/physical processes, etc., can solve the problem of difficult to obtain microscopic uniformity, unsatisfactory effect of catalytic elimination of VOCs, and difficult control of preparation process conditions, etc. question

Inactive Publication Date: 2006-03-29
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the main methods for preparing nanomaterials are: sol-gel method, co-precipitation method, liquid phase reaction method, physical vapor deposition method, solid phase reaction method, etc., but the main problem of these methods is that it is difficult to obtain microscopically uniform and non-agglomerated nanomaterials. Ideal composite powder for
[0003] Chinese patent z102136273.4 discloses a cerium-zirconium-barium composite oxide and its preparation method. It uses metal nitrate, cerium nitrate, zirconium nitrate, and barium nitrate as raw materials, and uses a polyethylene glycol polymer surface modifier. Butanol is produced by azeotropic distillation. It is an ultrafine particle with a high specific surface, but its preparation process conditions are difficult to control, and the content of precious metals is high. It is mainly used for automobile exhaust treatment, and the effect of catalytic elimination of VOCs is not ideal.

Method used

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Examples

Experimental program
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Effect test

Embodiment

[0020] Refer to the above preparation steps

[0021] Weigh Ce(NO 3 ) 3 ·6H 2 O, La(NO 3 ) 4 ·6H 2 O, add appropriate amount of water to dissolve and set aside. The molar ratio of the above substances is: X:1-X (X=0.1-0.9).

[0022] Slowly add the above-mentioned mixed solution dropwise in an aqueous solution containing polyethylene glycol (molecular weight is 6000-20000) weight percent of 1-10wt%, under magnetic stirring conditions, when the pH value of the solution is adjusted to 9-10 with ammonia water, Dropping was stopped.

[0023] After continuing to stir the above solution for 10-20 minutes, keep the solution at -5-0° C. for 20-30 hours.

[0024] Remove the solvent by suction filtration of the solution, dissolve the gel in n-butanol which is 8-10 times of the weight of the gel in n-butanol, heat in a three-necked flask, and when it reaches 93-100°C, the azeotrope is evaporated After the water is completely removed, the temperature rises rapidly to 118°C, the boi...

Embodiment 2

[0027] A specific embodiment of the preparation of cerium-lanthanum composite oxide powder, the steps are:

[0028] (1) Calculate and weigh 5.05-15.5g Ce (NO 3 ) 3 ·6H 2 O, 9.00-0.5g La(NO 3 ) 4 ·6H 2 O, add appropriate amount of water to dissolve and set aside.

[0029] (2) Slowly add the mixed solution described in ① in 100ml of aqueous solution containing polyethylene glycol (molecular weight: 20000) 5g, under magnetic stirring conditions, when the pH value of the solution is adjusted to 9-10 with ammonia water, stop the dripping .

[0030] (3) After continuing to stir for 15 minutes, the solution was kept at -5°C for 24 hours.

[0031] (4) Then the solution is suction filtered to remove the solvent, and the solid is dissolved in excess n-butanol, and heated in a three-necked flask. When it reaches 93-100°C, the azeotrope is distilled off, and the water is completely removed. Afterwards, the temperature rose rapidly to the boiling point of n-butanol, 118°C, and cont...

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Abstract

A process for preparing cerium lanthanum oxide nanoparticles used to treat VOCs features the azeotropic distillation of metallic nitrate, high-molecular surface modifier and n-butanol. It has high catalytic performance.

Description

technical field [0001] The invention relates to a new material used for catalyzing and eliminating VOCs catalyst coating: cerium-lanthanum composite oxide, in particular to a preparation method of ultrafine particle cerium-lanthanum composite oxide. Background technique [0002] Volatile organic compounds (Volatile Organic Compounds, referred to as VOCs) are highly toxic and widely present in indoor and outdoor air. Irritant and carcinogenic effects pose great health risks to people. Therefore, all countries in the world attach great importance to the development and research of VOCs treatment technology, and have strict regulations on emissions. Based on the increasingly urgent environmental pollution control requirements, exploring and searching for VOCs control technology has become a research hotspot. CeO 2 Based on inorganic non-metallic nanomaterials are widely used in automobile exhaust three-way catalyst carrier, environmental protection catalyst coating and so on....

Claims

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Application Information

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IPC IPC(8): C01F17/00B01J23/10
Inventor 陈敏周仁贤
Owner ZHEJIANG UNIV
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