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Two-phase mixed conductor oxygen-breathable film

A hybrid conductor, oxygen-permeable membrane technology, applied in semi-permeable membrane separation, membrane technology, chemical instruments and methods, etc., can solve the problems of high tension, material cracking and fragmentation, and high cost of dual-phase membrane preparation

Inactive Publication Date: 2004-01-07
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] (1) Since the oxygen ion-conducting phase and the electron-conducting phase are two materials with different structures, their expansion coefficients are very different, so at high temperatures, a large tension will be generated inside the material, thus making the material prone to cracks. missing and broken
[0013] (2) Since the noble metal is used as the electronically conductive phase, and the amount of the noble metal is generally above 40% (volume ratio), the preparation cost of this type of dual-phase film is very high, and it is difficult to apply in actual production

Method used

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  • Two-phase mixed conductor oxygen-breathable film

Examples

Experimental program
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Effect test

Embodiment 1

[0032] Synthesis of La by Citric Acid Complexation 0.15 Sr 0.85 Ga 0.3 Fe 0.7 o 3-δ .At first accurately weigh 2.092g metal gallium (99.999%), make it dissolve with nitric acid solution, pipette 19.36ml concentration and be 0.7747M La(NO 3 ) 3 , 91.80ml of Sr(NO 3 ) 2 , 42.11ml of Fe(NO 3 ) 3 , mix them to form a mixed solution, add 78.18g EDTA and 42.03g citric acid, and then use NH 3 .H 2 O adjusts the pH of the solution to 6.0, heats and stirs the solution at a constant temperature of 80°C, and finally obtains a purple-red colloid with the continuous evaporation of water, pretreats the colloid at 150°C and decomposes the initial powder at 950°C Calcined at ℃ for 5h to obtain LSGFO powder. It was detected as pure phase perovskite by XRD.

Embodiment 2

[0034] Synthesis of citric acid complexation.Ba 0.5 Sr 0.5 co 0.8 Fe 0.2 o 3-δ .The Ba(NO 3 ) 2 , 54ml concentration is 0.9259MSr (NO 3 ) 2 Solution, 12.03ml concentration is 1.6622M Fe(NO 3 ) 3 Solution, 79.01ml concentration is 1.0125M Co(NO 3 ) 2 solution, mix them evenly, add 74.45g EDTA and 63.04g citric acid, use NH 3 Adjust the pH to 6.0, heat and stir the solution at a constant temperature of 80°C, and finally obtain a purple-red colloid with the continuous evaporation of water, pretreat the colloid at 150°C for preliminary decomposition, and put the primary powder at 950°C Calcined for 5h to obtain BSCFO powder. It was detected as pure phase perovskite by XRD.

Embodiment 3

[0036] Preparation of dual-phase LSGFO-BSCFO sheet-like oxygen-permeable membrane: The synthesized LSGFO and BSCFO powders are ground and sieved to below 200 mesh. Then use a graduated cylinder to measure 12.8ml of LSGFO powder and 1ml of BSCFO powder, mix them evenly, and grind them with a ball mill for 20 hours. Then it is formed into pieces on a single-axis hydraulic press with a pressure of 15-20T / cm 2 . The dense LSGFO-BSCFO dual-phase membrane can be obtained by sintering the membrane at 1200°C for 10 hours. Example 4

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Abstract

The present invention relates to a two-phase mixed conductor oxygen-permeating membrane, formed from oxygen ion conductive phase and electronic conductive phase. The described oxygen ion conductive phase and electronic conductive phase are made of perovskite, finally the two-phase mixed conductor oxygen-mermeating membrane with simple perovskite structure can be formed, in whch the oxygen ion conductive phase is formed into its skeleton, and the electronic conductive phase as a continuous conductor wire is passed through the skeleton. Said invention provides the molecular formula of the perovskite, and the application of said oxygen-pemeating membrane.

Description

technical field [0001] The invention relates to the design, preparation and structure of a two-phase mixed conductor oxygen-permeable membrane and its use for selectively separating oxygen from a mixed gas containing oxygen, especially from air. Background technique [0002] Mixed conductor oxygen permeable membrane refers to a new type of ceramic membrane with both oxygen ion conductivity and electronic conductivity. At high temperatures (especially when the temperature is greater than 700°C), when there is an oxygen concentration gradient on both sides of the membrane, oxygen will be conducted in the form of oxygen ions through the bulk phase from the high oxygen pressure region to the low oxygen pressure region, and at the same time, the electrons will Conduction in the opposite direction keeps the material electrically neutral. This material does not require an external circuit to conduct electrons like solid oxide fuel cells. And because oxygen is conducted in the for...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/02
Inventor 杨维慎王海辉丛铀
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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