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Method for stabilizing perovskite structure oxygen permeation membrane through nanoparticles

A perovskite structure and nanoparticle technology, which is applied in separation methods, semipermeable membrane separation, and dispersed particle separation, can solve the problems of oxygen permeability attenuation and poor stability, and achieve high oxygen permeation flux and good long-term stability sexual effect

Active Publication Date: 2016-06-08
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For those materials with high oxygen permeability, the general stability is poor, such as SrCo 0.8 Fe 0.2 o 3-δ and Ba 0.5 Sr 0.5 co 0.8 Fe 0.2 o 3-δ
Literature reports SrCo 0.8 Fe 0.2 o 3-δ The phase transition temperature of Ba is 790°C, while Ba 0.5 Sr 0.5 co 0.8 Fe 0.2 o 3-δ When the operating temperature is below 850°C, a phase transition will occur, and the oxygen permeability will decay with time

Method used

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  • Method for stabilizing perovskite structure oxygen permeation membrane through nanoparticles
  • Method for stabilizing perovskite structure oxygen permeation membrane through nanoparticles

Examples

Experimental program
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Embodiment 1

[0024] Synthesis of SrCo by EDTA-citric acid joint complexation 0.8 Fe 0.2 o 3-δ Powder. Synthetic steps: take metal nitrate according to stoichiometric ratio: Sr(NO 3 ) 2 , Co(NO 3 ) 2 ·6H 2 O, Fe(NO 3 ) 3 9H 2 O is moved into the beaker, then add an appropriate amount of deionized water in the beaker to dissolve the metal nitrate into a transparent purple liquid, add EDTA acid and citric acid thereto, the mol ratio of EDTA acid, citric acid and total metal ions is: 1:1.5:1, then add ammonia water to adjust the pH value of the solution in the range of 6-10, heat the mixed solution at about 120°C while stirring until the mixed solution forms a purple-black sol, then transfer it to an evaporating dish at 200-400°C Continue heating until most of the organic matter is removed by spontaneous combustion, then put it into a muffle furnace and bake at 900-1100°C for 5-10 hours to obtain SrCo 0.8 Fe 0.2 o 3-δ Powder. The resulting SrCo 0.8 Fe 0.2 o 3-δ The powder was ...

Embodiment 2

[0027] Synthesis of Ba by EDTA-citric acid joint complexation 0.5 Sr 0.5 co 0.8 Fe 0.2 o 3-δ / BaCeO 3 Powder. Synthetic steps: take metal nitrate according to stoichiometric ratio: Ba(NO 3 ) 2 , Sr(NO 3 ) 2 , Co(NO 3 ) 2 ·6H 2 O, Fe(NO 3 ) 3 9H 2 O, Ce(NO 3 ) 3 ·6H 2 O is moved into the beaker, then add an appropriate amount of deionized water in the beaker to dissolve the metal nitrate into a transparent purple liquid, add EDTA acid and citric acid therein, the molar ratio of EDTA acid, citric acid and total metal ions is: 1 :1.5:1, then add ammonia water to adjust the pH value of the solution in the range of 6-10, heat the mixed solution at about 120°C while stirring until the mixed solution forms a purple-black sol, then transfer it to an evaporating dish and continue at 200-400°C Heat until spontaneous combustion to remove most of the organic matter, then put it into a muffle furnace and roast at 900-1100°C for 5-10 hours to obtain Ba 0.5 Sr 0.5 co 0.8...

Embodiment 3

[0032] Synthesis of Ba by EDTA-citric acid joint complexation 0.5 Sr 0.5 co 0.8 Fe 0.2 o 3-δ Powder. Synthetic steps: take metal nitrate according to stoichiometric ratio: Ba(NO 3 ) 2 , Sr(NO 3 ) 2 , Co(NO 3 ) 2 ·6H 2 O, Fe(NO 3 ) 3 9H 2 O is moved into a beaker, then add an appropriate amount of deionized water to the beaker to dissolve the metal nitrate into a transparent purple liquid, then add EDTA acid and citric acid to it, the molar ratio of EDTA acid, citric acid and total metal ions is: 1 :1.5:1, then add ammonia water to adjust the pH value of the solution in the range of 6-10, heat the mixed solution at about 120°C while stirring until the mixed solution forms a purple-black sol, then transfer it to an evaporating dish and continue at 200-400°C Heat until spontaneous combustion to remove most of the organic matter, then put it into a muffle furnace and roast at 900-1100°C for 5-10 hours to obtain Ba 0.5 Sr 0.5 co 0.8 Fe 0.2 o 3-δ Powder.

[0033]...

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Abstract

The present invention provides a method for stabilizing a perovskite structure oxygen permeation membrane through nanoparticles, and belongs to the technical field of oxygen permeation membranes. The method specifically comprises: doping nanoparticles into a perovskite structure oxygen permeation membrane having a unstable structure to make the nanoparticles be positioned at the grain boundary position of the material so as to obtain the perovskite structure oxygen permeation membrane having a stable structure, wherein the volume fraction of the nanoparticles in the oxygen permeation membrane material is 0.1-10%, and the particle size range of the nanoparticles is 2-500 nm. According to the present invention, a certain amount of the nanoparticles doing not react with the perovskite material is doped into the perovskite structure oxygen permeation membrane material so as to inhibit the phase structure transformation, such that the oxygen permeation membrane has characteristics of high oxygen permeation flux and good structure stability.

Description

technical field [0001] The invention belongs to the technical field of mixed conductor oxygen-permeable membranes, and in particular relates to a method for stabilizing an oxygen-permeable membrane with a perovskite structure by nanoparticles. Background technique [0002] Hybrid ion-electron conductors are multifunctional materials that can be used as catalysts, electrodes in fuel cells, and for gas separation. Among these applications, the preparation of pure oxygen has attracted extensive attention due to the fast oxygen ion transport capability of mixed ion-electronic conductor oxygen-permeable membranes at high temperatures. In addition, the oxygen-permeable membrane is also used for selective oxidation of low-carbon hydrocarbons, such as partial oxidation of methane to synthesis gas, selective oxidation of ethane to ethylene, etc. Oxygen-permeable membranes can also be used in water splitting for hydrogen production and CO in oxygen-enriched combustion processes 2 ca...

Claims

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Application Information

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IPC IPC(8): B01D71/02B01D67/00B01D53/22C04B35/26C04B35/622C01B13/02C01B3/34
Inventor 杨维慎刘妍朱雪峰
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI