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A kind of dense ceramic oxygen permeable membrane with high stability and high permeability and preparation method thereof

A high-permeability, high-stability technology, applied in separation methods, semi-permeable membrane separation, chemical instruments and methods, etc., can solve the long-term stability of oxygen-permeable membranes, chemical stability, mechanical strength and thermal shock resistance, high oxygen The permeation flux cannot be combined at the same time to achieve the effect of improving chemical stability, high mechanical strength, and avoiding corrosion damage

Inactive Publication Date: 2017-04-26
JINGDEZHEN CERAMIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to overcome the deficiencies in the prior art, to provide a kind of low oxygen partial pressure (such as helium atmosphere), CO 2 A dense ceramic oxygen-permeable membrane with good long-term stability and high oxygen permeation flux under atmosphere or reducing atmosphere, to solve the long-term stability performance (including chemical stability, mechanical strength and thermal shock resistance) of the prior art ceramic oxygen-permeable membrane and The problem that high oxygen permeation flux cannot be combined at the same time

Method used

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  • A kind of dense ceramic oxygen permeable membrane with high stability and high permeability and preparation method thereof

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Effect test

Embodiment 1

[0037] 1. In this embodiment, a dense ceramic oxygen-permeable membrane with high stability and high permeability is a tubular Ce 0.8 SM 0.2 o 2-δ -Sm 0.6 Sr 0.4 Fe 0.7 Cu 0.3 o 3-δ Two-phase dense ceramic oxygen-permeable membrane whose oxygen ion conductor phase is Ce 0.8 SM 0.2 o 2-δ Porous matrix, ion-electronic mixed conductor phase is Sm 0.6 Sr 0.4 Fe 0.7 Cu 0.3 o 3-δ , and located in the connected pores in the matrix; according to the volume percentage, the oxygen ion conductor phase is 85.4%, and the ion-electronic mixed conductor phase is 14.6%.

[0038] 2. The above-mentioned tubular Ce in this embodiment 0.8 SM 0.2 o 2-δ -Sm 0.6 Sr 0.4 Fe 0.7 Cu 0.3 o 3-δ The preparation method of dense ceramic oxygen-permeable membrane, its steps are as follows:

[0039] (1) Preparation of raw material powder

[0040] (1-1)Ce 0.8 SM 0.2 o 2-δ Preparation of Oxygen Ion Conductor Phase Powder

[0041] Using the co-precipitation method, first dissolve the co...

Embodiment 2

[0051] 1. In this embodiment, a dense ceramic oxygen-permeable membrane with high stability and high permeability is a tubular Ce 0.8 Gd 0.2 o 2-δ -Gd 0.6 Sr 0.4 Fe 0.75 Cu 0.25 o 3-δ Two-phase dense ceramic oxygen-permeable membrane whose oxygen ion conductor phase is Ce 0.8 Gd 0.2 o 2-δ Porous matrix, ion-electronic mixed conductor phase is Gd 0.6 Sr 0.4 Fe 0.75 Cu 0.25 o 3-δ , and located in the connected pores in the matrix; according to the volume percentage, the oxygen ion conductor phase is 85.7%, and the ion-electronic mixed conductor phase is 14.3%.

[0052] 2. The above-mentioned tubular Ce in this embodiment 0.8 Gd 0.2 o 2-δ -Gd 0.6 Sr 0.4 Fe 0.75 Cu 0.25 o 3-δ The preparation method of dense ceramic oxygen-permeable membrane, take corresponding metal nitrate as raw material, its technological parameter is the same as embodiment one, the tubular Ce that step (2) makes 0.8 Gd 0.2 o 2-δ The through-porosity of the oxygen ion conductor phase mat...

Embodiment 3

[0054] 1. In this embodiment, a high-stability and high-permeability dense ceramic oxygen-permeable membrane is a sheet-like Ce 0.8 Gd 0.2 o 2-δ -Gd 0.6 Sr 0.4 Fe 0.75 Cu 0.25 o 3-δ Two-phase dense ceramic oxygen-permeable membrane whose oxygen ion conductor phase is Ce 0.8 Gd 0.2 o 2-δ Porous matrix, ion-electronic mixed conductor phase is Gd 0.6 Sr 0.4 Fe 0.75 Cu 0.25 o 3-δ , and located in the connected pores in the matrix; according to the volume percentage, the oxygen ion conductor phase is 87.5%, and the ion-electronic mixed conductor phase is 12.5%.

[0055] 2. The above-mentioned flaky Ce in this embodiment 0.8 Gd 0.2 o 2-δ -Gd 0.6 Sr 0.4 Fe 0.75 Cu 0.25 o 3-δ The preparation method of dense ceramic oxygen-permeable membrane, its steps are as follows:

[0056] (1) Preparation of raw material powder

[0057] Using the corresponding metal nitrates as raw materials, Ce 0.8 Gd 0.2 o 2-δ Oxygen ion conductor phase powder and Gd 0.6 Sr 0.4 Fe 0.7...

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Abstract

A disclosed high-stability high-permeability compact ceramic oxygen-permeation membrane is composed of, in percentage by volume, 75-92% of an oxygen ion conductor phase and 8-25% of an ion-electron conductor phase; the oxygen ion conductor phase is a doped CeO2 porous matrix, and the ion-electron mixed conductor phase is a perovskite structure oxygen ion-electron mixed conductor and is disposed in a connected pore channel of the matrix. Additionally, the invention also discloses a preparation method for the above high-stability high-permeability compact ceramic oxygen-permeation membrane. The technical scheme effectively solves the problem that a ceramic oxygen-permeation membrane cannot simultaneously possess the long-term stability and the high oxygen permeation flux in the prior art. The oxygen permeation flux is improved, and also the high-stability high-permeability compact ceramic oxygen-permeation membrane has good long-term working stability.

Description

technical field [0001] The invention relates to the technical field of functional ceramic materials, in particular to a dense ceramic oxygen-permeable membrane and a preparation method thereof. Background technique [0002] The dense ceramic oxygen permeable membrane theoretically has 100% oxygen permeation selectivity, and it can be used in high-purity oxygen preparation, oxygen-enriched combustion and CO 2 Membrane reactors for capture, partial oxidation of natural gas (or methane) to synthesis gas or selective oxidation of hydrocarbons, CO 2 Decomposition reactors and other fields have good application prospects. In order to meet the requirements of practical industrial applications, the ceramic oxygen permeable membrane must have the following performance requirements: (1) High chemical stability: under the conditions of low oxygen partial pressure (or high oxygen partial pressure gradient), reducing atmosphere, carbon dioxide and sulfur dioxide atmosphere, etc. (2) It...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D71/02B01D67/00B01D53/22C04B35/50C04B35/622
Inventor 张小珍江瑜华王艳香周健儿常启兵王杰索帅峰
Owner JINGDEZHEN CERAMIC UNIV
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