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Method for preparing nano perovskite type rare-earth oxide

A technology of rare earth oxides and nano-rare earths, which is applied in the field of preparation of catalyst technology, can solve the problems of uneven particle distribution and difficulty in controlling the particle size of nano-perovskite-type rare earth oxides, and achieve uniform particle size distribution.

Inactive Publication Date: 2009-06-24
SHANGHAI NAT ENG RES CENT FORNANOTECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the particle size of the nano perovskite rare earth oxide prepared by this technology is difficult to control, and the particle distribution is not uniform

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Embodiment 1 prepares LaCoO 3 , the process flow is:

[0023] 1) Mixing of raw materials

[0024] The molar ratio of lanthanum chloride to cobalt chloride is 1:1, and sodium hydroxide with a molar ratio of 6:1 is added to the raw material, and the paste mixture is adjusted with deionized water.

[0025] 2) Preparation of precursor by mechanochemical reaction

[0026] Add grinding balls to the pasty mixture according to the ball-to-material ratio of 20:1, stir fully to mix the materials and balls evenly, put the compounded reaction substances on the planetary ball mill, and control the speed of the ball mill at 350r / min. The wet-solid phase reaction is carried out at room temperature and normal pressure.

[0027] 3) Precursor calcination

[0028] The precursor obtained by ball milling was dried and placed in a muffle furnace at a temperature of 700°C for calcination for 2 hours.

[0029] 4) Washing and drying

[0030] After the calcined material is washed with dist...

Embodiment 2

[0032] Example 2: Preparation of LaCoO 3 , the process flow is:

[0033] 1) Mixing of raw materials

[0034] The molar ratio of lanthanum chloride to cobalt chloride is 1:1, and sodium hydroxide is added with a molar ratio of 6:1 to the raw material, and adjusted to a paste with a small amount of deionized water.

[0035] 2) Preparation of precursor by mechanochemical reaction

[0036] Add grinding balls to the pasty mixture according to the ball-to-material ratio of 20:1, stir fully to mix the materials and balls evenly, put the compounded reaction substances on the planetary ball mill, and add sodium chloride as a grinding aid, The molar ratio of sodium chloride to raw material cobalt chloride is 10:1, the speed of the ball mill is controlled at 350r / min, and the wet-solid phase reaction is carried out at room temperature and normal pressure.

[0037] 3) Precursor calcination

[0038] The precursor obtained by ball milling was dried and placed in a muffle furnace at a te...

Embodiment 3

[0042] Example 3: Preparation of LaCoO 3 , the process flow is:

[0043] 1) Mixing of raw materials

[0044] The molar ratio of lanthanum chloride to cobalt chloride is 1:1, and sodium hydroxide is added with a molar ratio of 6:1 to the raw material, and adjusted to a paste with a small amount of deionized water.

[0045] Add grinding balls according to the ball-to-material ratio of 20:1, and stir fully to mix the materials and balls evenly.

[0046] 2) Preparation of precursor by mechanochemical reaction

[0047] Add grinding balls to the pasty mixture according to the ball-to-material ratio of 20:1, stir fully to mix the materials and balls evenly, put the compounded reaction substances on the planetary ball mill, and add sodium chloride as a grinding aid, The molar ratio of sodium chloride to raw material cobalt chloride is 10:1, the rotational speed of the ball mill is controlled at 500r / min, and the wet-solid phase reaction is carried out at room temperature and normal...

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PUM

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Abstract

The invention discloses a method for preparing nanometer perovskite type rare earth oxide in the technical field of catalyst, which comprises that: firstly, a rare earth raw material and a transition metal raw material are matched and then are mixed with strong base to be prepared into an even pasty mixture; and then the pasty mixture is orderly subjected to grinding, calcination, as well as washing and drying treatment to obtain nanometer rare earth composite oxide. The method adopts a mechanicochemical method to prepare a precursor substance, simplifies preparation working procedures, does not use an organic solvent in the whole reaction system, cannot cause the pollution to the environment, reduces the cost, and is easy for industrialized scale-up preparation.

Description

technical field [0001] The invention relates to a preparation method in the technical field of catalysts, in particular to a preparation method of nanometer perovskite type rare earth oxides. Background technique [0002] As an important catalytic material, rare earth composite oxide catalysts have been regarded as the preferred catalysts to replace noble metal catalysts since the 1980s due to their good thermal stability and low cost. Structure and natural perovskite (ABO 3 ) Similar rare earth composite oxides are one of the new solid materials that have been studied more. The special structure makes them very characteristic in the process of adsorption and catalysis, and they are good redox catalysts. Therefore, the perovskite rare earth composite oxide is also a very important material. In recent years, many studies and reports have been made on the preparation and application of perovskite rare earth nanocomposite oxides. It is commonly reported that the preparation...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/83B01J23/32B01J23/10C01G1/02
Inventor 刘洋盛小海何丹农
Owner SHANGHAI NAT ENG RES CENT FORNANOTECH
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