Method for preparing CeO2 nanoparticles from W/O type microemulsion

A microemulsion and nanotechnology, applied in nanotechnology, chemical instruments and methods, rare earth metal compounds, etc., can solve problems such as uneven dispersion, limited particle application and development, product agglomeration, etc.

Active Publication Date: 2012-06-27
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Currently preparing CeO 2 There are many particle methods, but there are generally problems such as serious agglomeration and uneven dispersion of the obtained products. The existence of these problems limits CeO 2 Application and Development of Particles

Method used

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  • Method for preparing CeO2 nanoparticles from W/O type microemulsion
  • Method for preparing CeO2 nanoparticles from W/O type microemulsion
  • Method for preparing CeO2 nanoparticles from W/O type microemulsion

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Experimental program
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Embodiment Construction

[0037] 1. Surfactant P507 and organic solvent n-heptane are mixed into an emulsifier, wherein the mass ratio of P507 and n-heptane is 95:5, 90:10, 88:12, 85:15, 80:20,70: 30, 60:40, 50:50, 40:60, 30:70, 20:80, 10:90, and then use the same concentration of NaOH solution to saponify emulsifiers with different mass ratios until a clear and uniform solution is obtained by visual observation until.

[0038] 2. obtain according to specific embodiment: the solubilizing effect of microemulsion zone is the most obvious when n-heptane mass ratio is 10%, so P507 and C in the emulsifier 7 h 16 The mass ratio was determined to be 90:10.

[0039] The embodiment of emulsifier preparation process sees the following table:

[0040]

[0041] 3. Add emulsifier (P507: C 7 h 16 The mass ratio of emulsifier to sulfonated kerosene is 90:10) mixed with sulfonated kerosene, and the mass ratios of emulsifier and sulfonated kerosene are respectively set to 9.75:0.25, 9.5:0.5, 9:1, 8.5:1.5, 8:2, ...

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Abstract

The invention which relates to a method for preparing CeO2 nanoparticles from a W / O type microemulsion belongs to the nanomaterial preparation field. The method comprises the following steps: 1, determining a microemulsion region which comprises a surfactant 2-ethylhexyl phosphonic acid mono-2-ethylhexyl ester (hereinafter referred to as P507), an oil phase sulfonated kerosene, an organic solvent n-heptane and a water phase sodium hydroxide solution, wherein an emulsifier comprises the surfactant P507 and the organic solvent n-heptane, and the range of the mass ratio of the emulsifier to the sulfonated kerosene to NaOH in the sodium hydroxide solution is 9.85-93.08:2.39-88.67:1.48-10.85; 2, adding a Ce salt solution to the microemulsion region under stirring to obtain a loaded organic phase; 3, adding a precipitant oxalic acid solution to the loaded organic phase to obtain a predecessor; and 4, roasting the predecessor at 250-750DEG C for 1.5-6.5h to obtain the spherical CeO2 nanoparticles with the powder morphology of 10-20nm. The CeO2 nanoparticles prepared in the invention have the advantages of no obvious particle agglomeration and uniform particle size distribution.

Description

1. Technical field [0001] The invention belongs to the field of preparation of nanomaterials, especially the preparation of nano CeO by microemulsion 2 particle method. 2. Background technology [0002] my country is rich in rare earth resources, accounting for more than 80% of the world's proven reserves, of which cerium is the most abundant. Rare earth oxide CeO 2 It is a relatively important light rare earth product, which has been widely used in luminescent materials, catalysts, electronic ceramics, ultraviolet absorbers, precision polishing materials, etc. And because of its superior oxygen storage and release function and high-temperature rapid oxygen vacancy diffusion ability, it has become a very promising automotive exhaust catalytic purification material, solid oxide fuel cell (SOFC) anode material, electrochemical reaction promotion material, etc. [0003] Currently preparing CeO 2 There are many particle methods, but there are generally problems such as serio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F17/00B82Y40/00
Inventor 梅燕聂祚仁
Owner BEIJING UNIV OF TECH
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