Preparation method of tubular asymmetric oxygen-permeable membrane

An asymmetric membrane, asymmetric technology, applied in the field of functional ceramic materials, can solve the problems of small oxygen permeable area of ​​sheet membrane, lack of practical application value, etc., to solve the matching problem of chemical compatibility and thermal expansion coefficient, sintering shrinkage rate Consistent, thin effect

Inactive Publication Date: 2013-08-21
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the small size and simple shape of the sheet membrane, the preparation process is relatively easy, but the effective oxygen permeability area of ​​the sheet membrane is small, which lacks practical application value

Method used

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  • Preparation method of tubular asymmetric oxygen-permeable membrane
  • Preparation method of tubular asymmetric oxygen-permeable membrane
  • Preparation method of tubular asymmetric oxygen-permeable membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] (1) Preparation of BCFN powder: BaCo 0.7 Fe 0.2 Nb 0.1 o 3-x (BCFN) powders were prepared by traditional solid-phase synthesis. First, the BaCO according to the stoichiometric ratio 3 、Co 3 o 4 , Fe 2 o 3 and Nb 2 o 5 The powders (both with a purity greater than 99%) were uniformly mixed by ball milling for 48 h (dry mixing), and the mixture was cold isostatically pressed at 75 MPa, and then solid-phase synthesized at 950 °C, crushed, sieved (40 mesh), and then 72 h Fine grinding (wet grinding) so that the average particle size of BCFN powder reaches 1 μm, and the obtained powder after drying will be used as the matrix material of the porous support and the dense layer in the preparation of the asymmetric membrane.

[0034] (2) Preparation of pore-forming agent: Spheroidal graphite is selected as the pore-forming agent, and the average particle size of graphite after sieving is 25 μm. Surface modification of graphite, immerse graphite in an aqueous solution o...

Embodiment 2

[0038] (1) Preparation of BCFN powder: BaCo 0.7 Fe 0.2 Nb 0.1 o 3-x (BCFN) powders were prepared by traditional solid-phase synthesis. First, the BaCO according to the stoichiometric ratio 3 、Co 3 o 4 , Fe 2 o 3 and Nb 2 o 5 The powders (both with a purity greater than 99%) were uniformly mixed by ball milling for 48 h (dry mixing), and the mixture was cold isostatically pressed at 75 MPa, and then solid-phase synthesized at 950 °C, crushed, sieved (40 mesh), and then 72 h Fine grinding (wet grinding) so that the average particle size of the BCFN powder reaches 2 μm, and the obtained powder after drying will be used as the matrix material of the porous support and the dense layer in the preparation of the asymmetric membrane.

[0039] (2) Preparation of pore-forming agent: Spheroidal graphite was selected as the pore-forming agent, and the average particle size of graphite after sieving was 27 μm. Surface modification of graphite, immerse graphite in an aqueous solu...

Embodiment 3

[0043] (1) Preparation of BCFN powder: BaCo 0.7 Fe 0.2 Nb 0.1 o 3-x (BCFN) powders were prepared by traditional solid-phase synthesis. First, the BaCO according to the stoichiometric ratio 3 、Co 3 o 4 , Fe 2 o 3 and Nb 2 o 5 The powders (both with a purity greater than 99%) were uniformly mixed by ball milling for 48 h (dry mixing), and the mixture was cold isostatically pressed at 75 MPa, and then solid-phase synthesized at 950 °C, crushed, sieved (40 mesh), and then 72 h Fine grinding (wet grinding) so that the average particle size of BCFN powder reaches 3 μm, and the obtained powder after drying will be used as the matrix material of the porous support and the dense layer in the preparation of the asymmetric membrane.

[0044] (2) Preparation of pore-forming agent: Spheroidal graphite is selected as the pore-forming agent, and the average particle size of graphite after sieving is 30 μm. Surface modification of graphite, immerse graphite in aqueous solution of s...

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Abstract

The invention relates to a preparation method of a tubular asymmetric oxygen-permeable membrane, belonging to the technical field of functional ceramic materials. By selecting the pore forming agent and controlling the bisque firing temperature, the invention implements bisque firing of a porous support under the condition of undecomposed pore forming agent, effectively prevents the compact layer slurry from entering the inside of the pores of the support in the dipping process, and enables the precursor obtained by bisque firing to have higher mechanical strength. The asymmetric bifacial dipping method is utilized to successfully attach the uniform-thickness thin compact layer to the outer wall of the tubular precursor, thereby lowering the possibility of damage of the precursor due to overhigh pressure in the dipping process, and having favorable effect on preparing complex-shape great-dimension tubular compact layers.

Description

technical field [0001] The present invention relates to a kind of BaCo 0.7 Fe 0.2 Nb 0.1 o 3-x (wherein x represents an oxygen vacancy) a method for preparing a tubular asymmetric oxygen-permeable membrane belongs to the technical field of functional ceramic materials. Background technique [0002] The mixed conductor oxygen permeable membrane material is a functional ceramic material with a perovskite structure, which has dual conductivity of oxygen ions and electrons, and theoretically has 100% selective permeability to oxygen. It is used in pure oxygen preparation, fuel cells and membrane reactions. Devices and other fields have broad application prospects. Among many mixed conductor oxygen permeable membrane materials, BaCo 0.7 Fe 0.2 Nb 0.1 o 3-x (BCFN) is a material with great application prospects. After testing, the oxygen permeability of the BCFN membrane can reach 20 ml 20 ml (STP) cm -2 min -1 , and can work stably for a long time in a strong reducing at...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B38/06C04B35/32C04B35/622C04B41/85
Inventor 孟星宇丁伟中金容王贺盖永乾吉福堂葛勇谢东强
Owner SHANGHAI UNIV
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