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Alumina doped mixed conductive dense oxygen penetrating membrane material

An alumina and oxygen-permeable membrane technology, used in semi-permeable membrane separation, membrane technology, oxygen preparation and other directions, can solve the problems of high membrane cost, insufficient membrane material structure and chemical stability, etc. and structural stability, the effect of high oxygen transmission rate

Active Publication Date: 2005-11-23
NANJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, the use of mixed conductor dense oxygen-permeable membrane materials in the process of oxygen permeability and partial oxidation of methane still has problems such as high cost of the membrane, insufficient oxygen flux and insufficient structure and chemical stability of the membrane material in a reducing atmosphere, so Not yet available for industrial application

Method used

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  • Alumina doped mixed conductive dense oxygen penetrating membrane material
  • Alumina doped mixed conductive dense oxygen penetrating membrane material
  • Alumina doped mixed conductive dense oxygen penetrating membrane material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] The existing perovskite material SrCo 0.8 Fe 0.2 o 3-δ and Al 2 o 3 The materials of the present invention with a doping amount of 1, 3, 5 and 10% were respectively roasted at 950° C. in an air atmosphere for 5 hours, and then carried out X-ray diffraction test. The results are shown in figure 1 .

[0019] from figure 1 It can be seen that Al 2 o 3 There is no impurity peak in the material with a doping amount of 1-5% by weight, indicating that a complete perovskite structure has been formed; Al 2 o 3 The doping amount is 10%, such as Al 2 o 3 、CoAl 2 o 4 and SrFe 7 Al 5 o 19 and other miscellaneous phases. with SrCo 0.8 Fe 0.2 o 3-δ material compared to doped 10% Al 2 o 3 The diffraction peak of the material around 32° has a certain shift, indicating that the microstructure of the material has changed.

Embodiment 2

[0021] Will Al 2 o 3 Doping amount is 1, 3 and 10% under the pure oxygen permeability condition of the material of the present invention, respectively with oxygen partial pressure gradient being 0.21 / 1×10 -3 atm conducts the oxygen transmission rate test, the results are shown in figure 2 .

[0022] figure 2 It can be seen that the oxygen permeability decreases with the decrease of temperature, and with the increase of Al 2 o 3 decreased with increasing doping levels.

Embodiment 3

[0024] to Al 2 o 3 The materials of the present invention with a doping amount of 1, 3, 5 and 10% were subjected to X-ray diffraction tests before and after oxygen permeability respectively, and the results were as follows: image 3 .

[0025] image 3 The results can be seen that 1-5% Al 2 o 3 Doped SrCo 0.8 Fe 0.2 o 3-δ The structure remained almost the same before and after the oxygen permeability test, while 10% Al 2 o 3 Doped SrCo 0.8 Fe 0.2 o 3-δ Subtle changes have taken place in the material of the film, indicating that the microstructure of the latter material changes more than that of Al during the membrane catalytic reaction. 2 o 3 Materials with lower doping levels will be more pronounced. Therefore the Al in the material of the present invention 2 o 3 Doping amount does not exceed 20%, Al 2 o 3 The optimal range of the doping amount is 1-10%, and the material within this range of doping amount is relatively stable.

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Abstract

This invention relates to a mixing conductive compact transmission oxygen film material used in the oxygen effusion and film reaction, which comprises the perovskite crystal composite oxides whose general formula is C1-xC'xD1-yD'yO3-delta, and the alumina, wherein the delta is oxygen lattice defect number, C and C' is one of elements of Ld, Sm, Nd, Pr, Ba, Ca, Sr, Na and La; D,D'is one of elements of Mn, Cr, Fe, Co, Ni and Cu; 0<=x<=1,0<=y<=1, and the mass percentage of alumina is 1~20%. The film has good stability in the high temperature anoxia condition, and it is fit for longtime working in the film action condition.

Description

technical field [0001] The invention relates to an aluminum oxide-doped mixed-conductivity dense oxygen-permeable membrane material. Background technique [0002] Disclosed in the U.S. Patent (U.S.Pat.No.5,160,713, Nov.3,1992) is a kind of dense oxygen-permeable inorganic film material of mixed conductor, and this film material is a kind of general formula is C 1-x C' x D. 1-y D' y o 3-δ The perovskite composite oxide, where δ is the number of oxygen lattice defects, C, C' is any element in Ld, Sm, Nd, Pr, Ba, Ca, Sr, Na, La, D, D' Any one of Mn, Cr, Fe, Co, Ni, Cu, 0≤x≤1, 0≤y≤1. This material has the ability to conduct mixed ions and electrons, not only can selectively transmit oxygen at medium and high temperatures, but also has catalytic activity, so it shows very attractive application prospects in pure oxygen preparation, fuel cells, and chemical reactors. In recent years, the use of mixed-conductor dense oxygen-permeable membrane materials for partial oxidation o...

Claims

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Application Information

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IPC IPC(8): B01D71/02
Inventor 徐南平金万勤吴振涛
Owner NANJING UNIV OF TECH