Process for preparing high purity active nano ceria

A nano-ceria, active technology, applied in chemical instruments and methods, inorganic chemistry, rare earth metal compounds, etc., can solve problems such as poor product performance, harsh reaction conditions, complex production processes, etc., and achieve a simple and easy control process. , Simple equipment, high purity effect

Inactive Publication Date: 2005-12-07
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] However, the above methods all have fatal problems such as poor product performance, high production cost, harsh reaction conditions, difficult process control, complex production process, and environmental pollution.

Method used

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  • Process for preparing high purity active nano ceria
  • Process for preparing high purity active nano ceria
  • Process for preparing high purity active nano ceria

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Example 1 Weighing Ce(NO 3 ) 3 ·6H 2 O 8.68g, be made into 0.1mol / L solution of 100ml, and add 1gPEG4000 wherein; Weigh (NH 4 ) 2 CO 3 ·H 2 O 5.13g, made into 150ml of 0.1mol / L solution. The prepared two solutions were placed in a water bath, preheated at 40°C for 10 min, and then (NH 4 ) 2 CO 3 ·H 2 The O solution was quickly poured into the Ce(NO 3 ) 3 ·6H 2 O mixed solution, under 800r / min rotating speed electric mechanical stirring reaction 10min, the obtained precursor Ce 2 (CO 3 ) 3 ·H 2 O sol was washed twice with deionized water during the vacuum filtration process, and the filtered product was dispersed in absolute alcohol for 10 minutes by ultrasonic waves, vacuum filtration, repeated twice, and then vacuum-dried at 70°C to obtain the precursor The dry powder is put into a muffle furnace and calcined in the air at 300°C for 1 hour to obtain light yellow high-purity active nano-CeO 2 product, its XRD pattern is as follows figure 2 As shown, t...

Embodiment 2

[0021] Example 2 Weighing Ce(NO 3 ) 3 ·6H 2 O 8.68g, be made into 0.1mol / L solution of 100ml, and add 1gPEG4000 wherein; Weigh (NH 4 ) 2 CO 3 ·H 2 O 5.13g, made into 150ml of 0.1mol / L solution. At 40°C, the (NH 4 ) 2 CO 3 ·H 2 The O solution was quickly poured into the Ce(NO 3 ) 3 ·6H 2 O mixed solution, mechanical stirring reaction at 800rpm for 10min, the obtained precursor sol was washed twice with distilled water in the vacuum filtration process, the filtered product was put into absolute alcohol and dispersed by ultrasonic wave for 10min, vacuum filtration, repeated two times and then dried at 70°C, the resulting precursor gel powder was calcined in a muffle furnace at 700°C for 3 hours to obtain yellow high-purity active nano-CeO 2 The product has a grain size of 15.26nm and a BET specific surface area of ​​69.78m 2 / g, the purity is greater than 99.5%.

[0022] La

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Abstract

The invention discloses a process for preparing high purity nano cerium dioxide, which comprises using cerium salts as cerium source, using carbonates, oxalates or oxalic acid as precipitating reagent, charging surface active agent, carrying out chemical precipitation reaction under the mechanical stirring action, obtaining precursors, finally subjecting the precursors to filtration, scouring, dispersing, drying and sintering in Muffle type furnaces.

Description

technical field [0001] The invention belongs to the field of inorganic non-metallic materials. Background technique [0002] The invention relates to a kind of high-purity active nanometer CeO 2 The preparation method of powder, especially the preparation method of liquid phase method, the grain size is 5-30nm, and the specific surface area is 40-140g / cm 2 , CeO with a purity greater than 99.95% 2 powder method. [0003] Nano Rare Earth Oxide CeO 2 Due to its unique oxygen storage and release function and high-temperature rapid oxygen vacancy diffusion ability, it can be widely used in redox reactions, and has become a very promising catalytic material for automobile exhaust purification, high-temperature oxygen-sensitive semiconductors, pH sensors, and solid oxide fuel cells. (SOFC) electrode materials, electrochemical reaction accelerators, metal anti-oxidation, anti-corrosion coatings and additives, and chemical mechanical polishing (CMP) abrasives, etc., have great p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F17/00
Inventor 宋晓岚邱冠周曲鹏杨华明金胜明杨振华
Owner CENT SOUTH UNIV
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