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La and Cu doped BaFeO3-delta based ceramic oxygen permeable membrane material and preparation method thereof

An oxygen-permeable membrane and matrix material technology, applied in chemical instruments and methods, separation methods, membrane technology, etc., can solve problems such as unfavorable oxygen vacancy transmission, unit cell shrinkage, etc., achieve stable cubic phase structure, and improve oxygen permeability. Effect

Active Publication Date: 2019-03-08
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the radius of the La element is small, and excessive doping will cause the unit cell to shrink, which is not conducive to the transport of oxygen vacancies.

Method used

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  • La and Cu doped BaFeO3-delta based ceramic oxygen permeable membrane material and preparation method thereof
  • La and Cu doped BaFeO3-delta based ceramic oxygen permeable membrane material and preparation method thereof
  • La and Cu doped BaFeO3-delta based ceramic oxygen permeable membrane material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Example 1: Ba 0.975 La 0.025 Fe 0.9 Cu 0.1 o 3-δ Citric acid-nitrate synthesis

[0020] a) Add 0.163g La 2 o 3 , 10.192g Ba(NO 3 ) 2 , 14.544g Fe(NO 3 ) 3 9H 2 O, 0.966gCu(NO 3 ) 2 ·3H 2 O was dissolved in 400 mL of deionized water and 17 mL of 65 wt% HNO was added 3 , stirring for 6 hours;

[0021] b) After that, 23.380 g of ethylenediaminetetraacetic acid and 25.217 g of citric acid were added to the above solution, and the pH value of the solution was adjusted to 8 with 28 wt% ammonia water;

[0022] c) Subsequently, the mixed solution was evaporated in a water bath at 80°C to obtain a colloid, and the colloid was moved to an oven and ignited at 250°C to obtain a precursor powder;

[0023] d) Treat the precursor powder in an air atmosphere at 800°C for 8 hours. After cooling to room temperature, transfer it to a mortar, add 1wt% PVA and mix evenly. Use a mold to dry press the mixed precursor under a pressure of 200MPa forming. After sintering at 110...

Embodiment 2

[0024] Example 2: Ba 0.975 La 0.025 Fe 0.925 Cu 0.075 o 3-δ Citric acid-nitrate synthesis

[0025] a) Add 0.163g La 2 o 3 , 10.192g Ba(NO 3 ) 2 , 14.948g Fe(NO 3 ) 3 9H 2 O, 0.725gCu(NO 3 ) 2 ·3H 2 O was dissolved in 400 mL of deionized water and 20 mL of 65 wt% HNO was added 3 , stirred for 2 hours;

[0026] b) After that, 46.76g ethylenediaminetetraacetic acid and 25.217g citric acid were added to the above solution, and the pH value of the solution was adjusted to 6 with 28wt% ammonia water;

[0027] c) Then evaporate the mixed solution in a 60°C water bath to obtain a colloid, and move the colloid to an oven and ignite it at 200°C to obtain a precursor powder;

[0028] d) Treat the precursor powder in an air atmosphere at 400°C for 12 hours. After cooling to room temperature, transfer it to a mortar, add 1wt% PVA and mix evenly. Use a mold to dry press the mixed precursor under a pressure of 100MPa forming. After sintering at 1200℃ for 4h in air atmospher...

Embodiment 3

[0029] Example 3: Ba 0.975 La 0.025 Fe 0.85 Cu 0.15 o 3-δ Citric acid-nitrate synthesis

[0030] a) Add 0.163g La 2 o 3 , 10.192g Ba(NO 3 ) 2 , 13.736g Fe(NO 3 ) 3 9H 2 O, 1.450gCu(NO 3 ) 2 ·3H 2 O was dissolved in 400 mL of deionized water and 13 mL of 65 wt% HNO was added 3 , stirring for 10 hours;

[0031] b) After that, 35.070 g of ethylenediaminetetraacetic acid and 33.621 g of citric acid were added to the above solution, and the pH value of the solution was adjusted to 12 with 28 wt% ammonia water;

[0032] c) Then evaporate the mixed solution in a 100°C water bath to obtain a colloid, and move the colloid to an oven and ignite it at 400°C to obtain a precursor powder;

[0033] d) Treat the precursor powder in an air atmosphere at 900°C for 6 hours. After cooling to room temperature, transfer it to a mortar, add 1wt% PVA and mix evenly. Use a mold to dry press the mixed precursor under a pressure of 300MPa forming. After sintering at 1000℃ for 15h in a...

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Abstract

The invention belongs to the field of inorganic film materials, and relates to a La and Cu doped BaFeO3-delta based ceramic oxygen permeable membrane material and a preparation method thereof. The B position of Ba0.975La0.025FeO3-delta is doped with Cu, and the chemical formula of the material is Ba0.975La0.025Fe(1-x)CuxO3-delta, wherein x is larger than 0.05 and smaller than 0.3. The preparationmethod comprises the steps as follows: dissolving materials in deionized water, adding HNO3, performing stirring, adding citric acid and ethylenediaminetetraacetic acid, evaporating the mixed solutionin water bath at 60-100 DEG C to form colloid, and heating and igniting the colloid at 200-400 DEG C to obtain powder; treating the prepared powder in an air atmosphere at 400-900 DEG C, and performing grinding and dry-pressing forming after cooling to room temperature; heating the pressed sample to 1000-1200 DEG C in an air atmosphere, keeping the temperature for 4-15 hours, and performing sintering to prepare the dense Ba0.975La0.025Fe(1-x)CuxO3-delta oxygen permeable membrane product. The oxygen permeable membrane material has compact structure, high oxygen permeability, good stability andexcellent comprehensive performance, and can be applied to continuous oxygen supply for methane partial oxidation reaction and industrial processes of separation and purification of oxygen from otheroxygen-containing gases.

Description

technical field [0001] The invention belongs to the field of inorganic membrane materials, in particular to a BaFeO doped with La element at the A site and Cu element doped at the B site 3-δ Based ceramic oxygen permeable membrane material. Background technique [0002] Oxygen permeable membrane material is a kind of mixed conductor material that can conduct electrons and oxygen ions at the same time. At high temperature, when there is an oxygen concentration gradient on both sides of the membrane, due to the high electronic and oxygen ion conductivity of this type of material, oxygen can be transported to the other end of the membrane in the form of oxygen ions through oxygen vacancies, so the ceramic oxygen permeable membrane has High oxygen permselectivity. Therefore, the oxygen-permeable membrane material can be widely used in the partial oxidation of methane to synthesis gas (H 2 / CO), oxygen-enriched combustion, pure oxygen preparation and solid oxide fuel cell cath...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/40C04B35/622B01D53/22
CPCB01D53/228B01D2257/104C04B35/2683C04B35/622C04B2235/3215C04B2235/3227C04B2235/3281C04B2235/768Y02C20/20
Inventor 赵海雷刘子露李魁杜志鸿张旸
Owner UNIV OF SCI & TECH BEIJING
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