High-stability high-permeability two-phase composite oxygen separation membrane and preparation method thereof

A high-permeability, high-stability technology, applied in semi-permeable membrane separation, chemical instruments and methods, membrane technology, etc., can solve problems such as limiting the practical use of chromium-based materials, unstable dual-phase composite membrane structure, and membrane failure , to achieve good high oxygen permeability, good long-term stability, and reduced transport resistance

Inactive Publication Date: 2018-11-23
UNIV OF SCI & TECH OF CHINA
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

Generally, for chromium-based materials, chromium is usually volatile and toxic at high temperature, which greatly limits the practical application of chromium-based materials
The cobalt-based perovskite oxide has a relatively large thermal expansion coefficient, which leads to the instability of the structure of the dual-phase composite film, and it is easy to generate microcracks in the film during the thermal cycle, causing the film to fail.

Method used

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  • High-stability high-permeability two-phase composite oxygen separation membrane and preparation method thereof
  • High-stability high-permeability two-phase composite oxygen separation membrane and preparation method thereof
  • High-stability high-permeability two-phase composite oxygen separation membrane and preparation method thereof

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preparation example Construction

[0036] The invention provides a method for preparing a high-stability and high-permeability dual-phase composite oxygen separation membrane, comprising the following steps:

[0037] A) One-step synthesis of Ce by combustion method 0.8 SM 0.2 o 2-δ –La 0.9 Sr 0.1 FeO 3-δ Two-phase composite powder, δ is the concentration of oxygen vacancies;

[0038] Mixing the two-phase composite powder with an organic solvent to obtain a two-phase composite powder slurry;

[0039] B) mixing the pore-forming agent with an organic solvent to obtain a pore-forming agent slurry;

[0040] C) sequentially casting the two-phase composite powder slurry and the pore-forming agent slurry onto the surface of the carrier tape to obtain a casting layer compounded on the surface of the carrier tape;

[0041] curing and drying the casting layer compounded on the surface of the carrier tape to obtain a green body;

[0042] D) Sintering the green body to obtain a high-stability and high-permeability d...

Embodiment 1

[0077] Ce with different volume ratios of 6:4, 7:3 and 8:2 0.8 SM 0.2 o 2-δ –La 0.9 Sr 0.1 FeO 3-δ (SDC–LSF) dual-phase composite powders were synthesized in one step by combustion method. Specifically, La 2 o 3 , SrCO 3 , Fe(NO 3 ) 3 9H 2 O, Sm 2 o 3 and Ce(NO 3 ) 3 ·6H 2 O was dissolved in the nitric acid solution in the corresponding stoichiometric ratio, and then during the stirring process, citric acid was added to the solution in an amount of the substance with a molar ratio of 1:1.5 to the total metal ions, and the NH 3 ·H 2 O adjust the pH of the solution to 7-8. The solution complexed by citric acid is placed on an electric furnace to heat and evaporate water to form a gel, and then the gel is burned to form an initial powder. The obtained initial powder was sintered at 1000°C for 3h in the air atmosphere of a box-type resistance furnace to obtain a dual-phase composite powder. Ce with different volume ratios of 6:4, 7:3 and 8:2 0.8 SM 0.2 o 2-δ ...

Embodiment 2

[0082] The steps are as in Example 1, and the purge gas is replaced with CO 2 When purging, the gas flow rate is 40ml min -1 ; When CO is used as the sweep gas, the flow rate is 20ml min -1 . Figure 4 It is the variation curve of oxygen permeability of SDC-LSF dual-phase composite membrane with the volume content of LSF at 900 °C, where the purge gases are He and CO, respectively. It can be seen from the figure that the SDC70–LSF30 biphasic oxygen permeable membrane has the highest oxygen permeability, and the oxygen permeability reaches 1.02×10 under the air / He gradient. -7 mol cm -2 ·s -1 ; Under the air / CO gradient, the oxygen permeability reached 6.42×10 -7 mol cm -2 ·s -1 . According to the percolation theory, an important factor affecting the two-phase mixed conductor oxygen permeable membrane is the internal connection characteristics of the two phases in the composite membrane. figure 2 The BSEM image shows that LSF cannot form a continuous internal connecti...

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Abstract

The invention provides a preparation method of a high-stability high-permeability two-phase composite oxygen separation membrane. The method comprises the following steps that A, Ce0.8Sm0.2O2-Delta-La0.9Sr0.1FeO3-Delta two-phase composite power is prepared in one step by a combustion method, wherein Delta is the oxygen vacancy concentration; the two-phase composite power and an organic solvent aremixed to obtain two-phase composite power slurry; B, a pore-forming agent and the organic solvent are mixed to obtain pore-forming agent slurry; C, the two-phase composite power slurry and the pore-forming agent slurry are sequentially subjected to tape casting to the carrier band surface; a tape casting layer compounded on the carrier band surface is obtained; the tape casting layer compounded on the carrier band surface is cured and dried to obtain a raw blank; D, the raw blank is sintered to obtain the high-stability high-permeability two-phase composite oxygen separation membrane.

Description

technical field [0001] The invention belongs to the technical field of functional ceramics, and in particular relates to a high-stability and high-permeability two-phase composite oxygen separation membrane and a preparation method thereof. Background technique [0002] Energy and environmental issues have an important impact on the survival and development of human beings. For this reason, people are committed to the development of new alternative energy sources, including solar energy, nuclear energy, biomass energy, etc., and at the same time make full use of existing fossil energy and explore advanced energy processing and transformation. technology. More than 1 million tons of oxygen required by industry every year is obtained from air separation, and almost all large-scale clean energy technologies require oxygen as a raw material, so this market will expand in a large scale in the future. Many countries are vigorously developing clean energy technologies such as coal...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/02B01D67/00
CPCB01D67/0041B01D67/0067B01D71/024
Inventor 章珺瑜王仲涛武煜森宫正苗利娜刘卫
Owner UNIV OF SCI & TECH OF CHINA
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