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Aluminum-containing biphase mixed conductor oxygen permeation membrane material with good stability and preparation method thereof

A hybrid conductor, oxygen-permeable membrane technology, applied in separation methods, semi-permeable membrane separation, chemical instruments and methods, etc., can solve the problems of large linear expansion coefficient, poor mechanical strength, low oxygen permeability rate, etc., and achieve good mechanical properties. , good stability, surface dense effect

Inactive Publication Date: 2021-07-16
SUN YAT SEN UNIV
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, its road to industrial application is not ideal
The main reasons hindering the development of mixed conductor oxygen permeable membrane materials are their low oxygen permeation rate and poor mechanical strength.
The fundamental reason for this is that most of the two-phase mixed conductor oxygen-permeable membrane materials containing alkali metal elements are exposed to high temperature CO 2 Carbonate impurity phases are easily formed in the atmosphere, which blocks the oxygen transmission channel and greatly reduces the oxygen permeability, mechanical strength and stability of the membrane material.
However, for some traditional single-phase perovskite thin film materials, they have a large linear expansion coefficient during thermal cycling, and their chemical stability and structural stability are also poor.

Method used

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  • Aluminum-containing biphase mixed conductor oxygen permeation membrane material with good stability and preparation method thereof
  • Aluminum-containing biphase mixed conductor oxygen permeation membrane material with good stability and preparation method thereof
  • Aluminum-containing biphase mixed conductor oxygen permeation membrane material with good stability and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Accurately weigh 3.0781g La(NO 3 ) 3 , 0.7606g Sr(NO 3 ) 2 , 2.4966g Co(NO 3 ) 2 ·6H 2 O, 0.1694g Al(NO 3 ) 2 9H 2 O, 6.8507g Ce(NO 3 ) 2 ·6H 2 O, 14.9195g citric acid, add ammonia water to adjust the pH to 7~10, stir the solution until it becomes clear and transparent, put the beaker on a magnetic stirrer, heat and continue to evaporate until it turns into a gel, and then put the gel at 140°C Dry in an oven for 24 hours to obtain a fluffy xerogel, which is fully ground and then placed in a crucible and kept at 600°C for 8 hours for calcination to remove organic matter. Put the calcined powder into the crucible after grinding, and calcined at 950°C for 10 hours to obtain 60% Ce 0.9 La 0.1 o 2-δ -40% La 0.6 Sr 0.4 co 1-x Al x o 3-δ The powder is pressed at 10MPa to obtain a cake-shaped sheet, and the sheet is slowly heated up at 1250°C for 5 hours and sintered to obtain a dense dual-phase ceramic oxygen-permeable membrane material, and sanded to obtain...

Embodiment 2

[0028] Accurately weigh 3.0948g La(NO 3 ) 3 , 0.7760g Sr(NO 3 ) 2 , 2.3822g Co(NO 3 ) 2 ·6H 2 O, 0.3412g Al(NO 3 ) 2 9H 2 O, 6.8507g Ce(NO 3 ) 2 ·6H 2 O, 14.9738g citric acid, add ammonia water to adjust the pH to 7~10, stir the solution until it becomes clear and transparent, put the beaker on a magnetic stirrer, heat and continue to evaporate until it turns into a gel, and then put the gel at 140°C Dry in an oven for 24 hours to obtain a fluffy xerogel, which is fully ground and then placed in a crucible and kept at 600°C for 8 hours for calcination to remove organic matter. Put the calcined powder into the crucible after grinding, and calcined at 950°C for 10 hours to obtain 60% Ce 0.9 La 0.1 o 2-δ -40% La 0.6 Sr 0.4 co 1-x Al x o 3-δ The powder is pressed at 10MPa to obtain a cake-shaped sheet, and the sheet is slowly heated up at 1250°C for 5 hours and sintered to obtain a dense dual-phase ceramic oxygen-permeable membrane material, and sanded to obtain...

Embodiment 3

[0030] Accurately weigh 3.1290g La(NO 3 ) 3 , 0.7772g Sr(NO 3 ) 2 , 2.1484g Co(NO 3 ) 2 ·6H 2 O, 0.6923g Al(NO 3 ) 2 9H 2 O, 6.8507g Ce(NO 3 ) 2 ·6H 2 O, 15.0848g citric acid, add ammonia water to adjust the pH to 7~10, stir the solution until it becomes clear and transparent, put the beaker on a magnetic stirrer, heat and continue to evaporate until it turns into a gel, and then put the gel at 140°C Dry in an oven for 24 hours to obtain a fluffy xerogel, which is fully ground and then placed in a crucible and kept at 600°C for 8 hours for calcination to remove organic matter. Put the calcined powder into the crucible after grinding, and calcined at 950°C for 10 hours to obtain 60% Ce 0.9 La 0.1 o 2-δ -40% La 0.6 Sr 0.4 co 1-x Al x o 3-δ The powder is pressed at 10MPa to obtain a cake-shaped sheet, and the sheet is slowly heated up at 1250°C for 5 hours and sintered to obtain a dense dual-phase ceramic oxygen-permeable membrane material, and sanded to obtain...

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Abstract

The invention designs and prepares an aluminum-containing biphase mixed conductor oxygen permeation membrane material with high oxygen permeation amount, and belongs to the technical field of inorganic functional ceramic manufacturing. The general formula of the biphase mixed conductor oxygen permeation membrane material is 60Ce0.9La0.1O< 2-delta>-40La0.6Sr0.4Co<1-x>AlxO<3-delta> (x is equal to 0.05, 0.1, 0.2, 0.3 or 0.35). The preparation method comprises the steps of preparing required powder by using an improved one-pot-sol-gel method, calcining the powder in a muffle furnace at the temperature of 950 DEG C for 12 hours to obtain a precursor, tabletting the powder, and sintering at the temperature of 1250 DEG C to finally obtain the required mixed conductor oxygen permeation membrane. The mixed conductor oxygen permeation membrane material with high oxygen permeation amount is obtained by regulating and controlling the proportion of the multivalent and economical Al element. The biphase membrane material prepared by the method has excellent oxygen flux under the purging of gases such as helium / carbon dioxide. The material shows good long-term stability in low-oxygen argon and corrosive carbon dioxide atmospheres, and can be used as a novel oxygen source to be applied to the high-temperature complex atmosphere oxygen industry, such as the fields of oxygen-enriched combustion, water decomposition and methane coupling.

Description

technical field [0001] The invention belongs to the technical field of functional ceramics manufacturing, in particular to a chemical composition of 60% Ce 0.9 La 0.1 o 2-δ -40% La 0.6 Sr 0.4 co 1-x Al x o 3-δ Two-phase mixed conductor oxygen-permeable membrane material and its preparation method. Background technique [0002] With the continuous development of ceramic oxygen permeable membrane materials, it has received more and more attention as an environmentally friendly, clean and efficient air separation membrane. In particular, the corrosion resistance of oxygen-permeable membrane materials to carbon dioxide enables targeted capture and storage of carbon dioxide, and thus is considered as a potential material that can improve environmental and climate issues. At present, due to its excellent oxygen selective permeability and carbon dioxide resistance, the two-phase mixed conductor oxygen permeable membrane material is more used in the fields of oxygen-enriched...

Claims

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Application Information

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IPC IPC(8): C04B35/505C04B35/624B01D67/00B01D53/22
CPCC04B35/505C04B35/624B01D67/0039B01D53/228C04B2235/3222C04B2235/443C04B2235/6562C04B2235/6567C04B2235/6565C04B2235/465Y02C20/20
Inventor 罗惠霞李东乘王晓鹏黄彦昊曾令勇何溢懿
Owner SUN YAT SEN UNIV
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