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Method for preparing barium-cobalt-iron-niobium composite oxide with a low-temperature self-propagating combustion method

A self-propagating combustion and composite oxide technology, which is used in the preparation of ceramic oxygen-permeable membrane materials and functional materials, can solve the problems of small interval between temperature and material melting temperature, long time, and high energy consumption, which is conducive to sintering, The effect of reducing synthesis temperature and saving energy

Inactive Publication Date: 2009-10-07
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The object of the present invention is to provide a kind of low temperature self-propagating combustion method to prepare Ba 1.0 co 0.7 Fe 0.2 Nb 0.1 o 3-δ A materials approach to address the high-temperature solid-phase synthesis of Ba 1.0 co 0.7 Fe 0.2 Nb 0.1 o 3-δ The temperature in the material process is high, the time is long, the energy consumption is high, and the pure cubic phase Ba is synthesized 1.0 co 0.7 Fe 0.2 Nb 0.1 o 3-δ The temperature of the material and the melting temperature of the material are relatively small, etc.

Method used

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  • Method for preparing barium-cobalt-iron-niobium composite oxide with a low-temperature self-propagating combustion method
  • Method for preparing barium-cobalt-iron-niobium composite oxide with a low-temperature self-propagating combustion method
  • Method for preparing barium-cobalt-iron-niobium composite oxide with a low-temperature self-propagating combustion method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] 1) Mole ratio Ba(NO 3 ) 2 : Co(NO 3 ) 2 ·6H 2 O:Fe(NO 3 ) 3 9H2 The ratio of O=1:0.7:0.2, weigh Ba(NO 3 ) 2 13.067 g, Co(NO 3 ) 2 ·6H 2 O 10.186 g, Fe(NO 3 ) 3 9H 2 O 4.04 grams, dissolved in 300ml deionized water;

[0030] 2) take by weighing citric acid (C 6 h 8 o 7 ·H 2 O) 21.014 grams were mixed with the solution obtained in the first step, and stirred for 10 minutes under heating in a water bath at 80° C. to obtain a dark red clear solution;

[0031] 3) Press Ba 1.0 co 0.7 Fe 0.2 Nb 0.1 o 3-δ The stoichiometric ratio weighs Nb 2 o 5 0.665 g, add excess HF acid and heat it in a water bath at 80°C to promote its complete reaction. After cooling with ice water, add ammonia water dropwise to the obtained clear liquid, and adjust the pH value to 9. When the precipitation is complete, the precipitate is suction filtered and washed After several times, the filter cake was transferred to a beaker and added with 0.01mol citric acid (C 6 h 8 o 7 ·...

Embodiment 2

[0035] 1) synchronously with 1) of embodiment 1;

[0036] 2) take by weighing citric acid (C 6 h 8 o 7 ·H 2 O) 12.608 g was mixed with the solution obtained in the first step, and stirred for 5 minutes under heating in a water bath at 80° C. to obtain a red clear solution;

[0037] 3) 3) in step with embodiment 1;

[0038] 4) Synchronize with 4) of embodiment 1;

[0039] 5) step 5) of embodiment 1, the XRD collection of illustrative plates of synthetic product sees figure 2 , no impurity phase was seen.

Embodiment 3

[0041] 3) 1) in step with embodiment 1;

[0042] 4) take by weighing citric acid (C 6 h 8 o 7 ·H 2 O) 42.028 g was mixed with the solution obtained in the first step, and stirred for 5 minutes under heating in a water bath at 80° C. to obtain a red clear solution;

[0043] 3) 3) in step with embodiment 1;

[0044] 4) Synchronize with 4) of embodiment 1;

[0045] 5) step 5) of embodiment 1, the XRD collection of illustrative plates of synthetic product sees image 3 , no impurity phase was seen.

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Abstract

The present invention belongs to a method for preparing barium-cobalt-iron-niobium oxide powder and is applied to the field of oxygen permeable membrane. The invention is characterized by comprising the following steps: firstly combining the treated Nb2O5, Ba(NO3)2, Co(NO3)2*6H2O and Fe(NO3)3*6H2O according to a stoichiometric proportion for preparing into an uniform transparent water solution, adding appropriate amount of complexing agent of lemon acid and glycin for obtaining a clear precursor solution; after evaporating most of water in the precursor solution, transferring the solution into an evaporating dish and heating when the temperature is controlled to 200-300 DEC C until the heating is finished for obtaining the fleecy primary powder; calcining the primary powder for 5 hour in the temperature of 950 DEG C for obtaining the final product Ba1.0Co0.7Fe0.2Nb0.1O3-delta in the cubic perovskite phase. The device required by the method is few and the consumed time is little. The molecule-level homogeneous mixing and accurate and controllable chemometry can be obtained. The obtained product has the advantages of fine particle and high purity. The phase-forming temperature of cubic phase is reduced. The interval between the pure cubic phase material synthesis and the fusion temperature of material is enlarged. The baking of tube oxygen permeable device is facilitated.

Description

technical field [0001] The invention belongs to the field of functional materials, and relates to a method for preparing Ba 1.0 co 0.7 Fe 0.2 Nb 0.1 o 3-δ The material method is applied to the field of preparing ceramic oxygen-permeable membrane materials. Background technique [0002] The mixed conductor ceramic oxygen permeable membrane material has the ability of oxygen ion conduction and electron conduction at the same time. It has very high oxygen permeability at high temperature. The oxygen permeation flux of some optimized materials can even be comparable to that of microporous membranes. . Economic accounting shows that the use of mixed conductor oxygen permeable membrane for oxygen production may save nearly 50% of the cost compared with the traditional air separation method. The research and development of ceramic oxygen-permeable membrane materials is the core and hot spot of oxygen-permeable membrane research. In 2006, Japanese scholar Makoto et al. found ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/01C04B35/64
Inventor 仇卫华李敬李福燊鲁雄刚
Owner UNIV OF SCI & TECH BEIJING
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