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Composite oxygen penetrating ceramics membrane, preparation method, and application

A ceramic membrane and oxide technology, applied in the field of composite oxygen-permeable ceramic membrane, can solve the problems of material performance impact, low oxygen permeability, high material tension, etc., to achieve high structural stability, high chemical stability, high oxygen permeability sexual effect

Active Publication Date: 2007-12-26
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0013] (1) Since the oxygen ion conductive phase and the electronically conductive phase are two materials with different structures, their expansion coefficients are very different, so at high temperature, it will cause a large tension inside the material, so that the material is prone to cracks with broken
[0014] (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
[0015] (3) Oxygen permeability of such materials is very low due to the presence of noble metal phases hindering the transport of oxygen ions
Since mechanical mixing cannot achieve complete uniformity, the degree of inhomogeneity will definitely have an impact on the properties of the material
However, research in this area has not been reported, and it is unknown how much impact it will have.

Method used

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  • Composite oxygen penetrating ceramics membrane, preparation method, and application
  • Composite oxygen penetrating ceramics membrane, preparation method, and application
  • Composite oxygen penetrating ceramics membrane, preparation method, and application

Examples

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Embodiment 1

[0072] Synthesis of (100-x) wt% Ce by direct mixing of all metal ion nitrates 0.95 Gd 0.05 o 1.9 -x wt%Gd 0.2 Sr 0.8 FeO 3 Composite film, where 20≤x≤80. According to the desired relative mass ratio of the two oxides, stoichiometric doses of all metal ions (Ce 3+ 、Gd 3+ 、Sr 2+ , Fe 3+ ) nitrate and a beaker, to which an appropriate amount of EDTA and citric acid are added, that is, the ratio of EDTA and citric acid to the amount of total metal ions is 1:1 and 1:1.5 respectively. Then use NH 3 .H 2 O adjust the pH of the solution to 6.0, heat and stir the solution at a constant temperature of 80°C, and finally obtain a colloid with the continuous evaporation of water, pretreat the colloid at 400°C for preliminary decomposition, and calcinate the primary powder at 900°C After 5 hours, the composite oxide powder obtained by the mixed solution method was obtained. The powder is compressed into tablets at 200-400 MPa. The pressed green sheet is sintered at 1400°C for 3...

Embodiment 2

[0074] Synthesis of (100-x)wt%Ce by directly mixing two oxides 0.8 Gd 0.2 o 1.9 -xwt%Gd 0.2 Sr 0.8 FeO 3 Composite film, where 20≤x≤80. Synthesis of Fast Oxygen Ion Conductor GDC and Mixed Conductor Gd by EDTA-citric Acid Complexation 0.2 Sr 0.8 FeO 3 . Take chemical dose of metal ion nitrate and beaker, add appropriate amount of EDTA and citric acid therein, that is, the ratio of EDTA and citric acid to total metal ion amount is 1:1 and 1:1.5 respectively. Then use NH 3 .H 2 O adjust the pH of the solution to 6.0, heat and stir the solution at a constant temperature of 80°C, and finally obtain a colloid with the continuous evaporation of water, pretreat the colloid at 400°C for preliminary decomposition, and calcinate the primary powder at 900°C 5h get GDC and Gd 0.2 Sr 0.8 FeO 3 Powder. It was detected as pure phase perovskite by XRD. Then, the two splits are uniformly mixed according to a certain mass ratio, and then compressed into tablets under 200-400 MPa...

Embodiment 3

[0076] Synthesis of (100-x) wt% Ce by direct mixing of all metal ion nitrates 0.75 SM 0.25 o1.875 -xwt%Sm 0.8 Sr 0.2 FeO 3 Composite film, where 20≤x≤80. According to the desired relative mass ratio of the two oxides, stoichiometric doses of all metal ions (Ce 3+ 、Sm 3+ 、Sr 2+ , Fe 3+ ) nitrate and a beaker, to which an appropriate amount of EDTA and citric acid are added, that is, the ratio of EDTA and citric acid to the amount of total metal ions is 1:1 and 1:1.5 respectively. Then use NH 3 .H 2 O adjust the pH of the solution to 6.0, heat and stir the solution at a constant temperature of 80°C, and finally obtain a colloid with the continuous evaporation of water, pretreat the colloid at 400°C for preliminary decomposition, and calcinate the primary powder at 900°C After 5 hours, the composite oxide powder obtained by the mixed solution method was obtained. The powder is compressed into tablets at 200-400 MPa. The pressed green sheet is sintered at 1400°C for 3 ...

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Abstract

This invention discloses a composite oxygen-permeable ceramic film, which is composed of oxygen ion-electron composite conductor and oxygen ion conductor at a wt. ratio of (1:4)-(4:1). The oxygen ion conductor is an oxide with fluorite structure, and the oxygen ion-electron composite conductor is an oxide with perovskite structure. The chemical formula is (100-x) wt.% Ce1-yLnyO2-y / (2-x) wt.% Ln1-zBzMO3, wherein, 20 less than or equal to x less than or equal to 80; 0.05 less than or equal to y less than or equal to 0.5; 0 less than or equal to z less than or equal to 1; Ln is one or more of lanthanide elements and Y; B is one or more of Ba, Sr, Ca, Mg, Pb and Bi; M is one or more of Cr, Mn, Fe, Zn, Ga, Al, Zr and Ti. The composite oxygen-permeable ceramic film is synthesized by mixing the nitrate solutions of all metal ions directly, which can endow the ceramic film with higher oxygen permeability.

Description

technical field [0001] The invention relates to a composite oxygen-permeable ceramic membrane. [0002] The present invention also relates to a preparation method of the composite oxygen-permeable ceramic membrane. [0003] The present invention also relates to the application of the composite oxygen-permeable ceramic membrane. Background technique [0004] 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 cond...

Claims

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Application Information

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IPC IPC(8): C04B35/01C04B35/622
CPCY02C20/20
Inventor 杨维慎朱雪峰丛铀
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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