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Calcium-containing double-phase mixed conductor oxygen permeation membrane material with good stability and preparation method thereof

A technology of mixed conductors and stability, which is applied in the field of functional ceramics manufacturing and can solve problems such as oxygen flux decline

Inactive Publication Date: 2021-04-02
SUN YAT SEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

On the other hand, the recently developed single-phase CaTi 0.9 Fe 0.1 o 3-δ Calcium-containing mixed-conductor oxygen-permeable membrane material, since there is no alkaline earth metal such as Sr / Ba in the system, it is more stable than other single-phase mixed-conductor oxygen-permeable membrane materials in a corrosive functional atmosphere, but at 950°C There is still a drop in oxygen flux over the temperature range

Method used

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  • Calcium-containing double-phase mixed conductor oxygen permeation membrane material with good stability and preparation method thereof
  • Calcium-containing double-phase mixed conductor oxygen permeation membrane material with good stability and preparation method thereof
  • Calcium-containing double-phase mixed conductor oxygen permeation membrane material with good stability and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Accurately weigh 2.3550g Ce(NO 3 ) 3 ·6H 2 O, 2.8982g Pr(NO 3 ) 3 ·6H 2 O, 2.4226g Fe(NO 3 ) 3 9H 2 O, 7.5599g citric acid, add ammonia water and adjust the pH to 7-10, stir the solution until it becomes clear and transparent, place the beaker on a magnetic stirrer, and heat and continue to evaporate until it turns into a gel, then put the gel in Dried in an oven at 150°C for 24 hours to obtain a fluffy xerogel, which was thoroughly ground and then put into a crucible and kept at 600°C for 8 hours for calcination to remove organic matter. The calcined powder was ground and put into a crucible, and calcined at 950°C for 10 hours to obtain Ce 0.9 PR 0.1 o 2-δ -PrFeO 3-δ The powder is pressed at 10MPa to obtain a cake-shaped sheet, and the sheet is slowly heated at 1400°C for 5 hours to sinter to obtain a dense dual-phase ceramic oxygen-permeable membrane material, and sanded to obtain a calcium-containing mixed conductor with good stability Oxygen permeable me...

Embodiment 2

[0030] Accurately weigh 2.4747g Ce(NO 3 ) 3 ·6H 2 O, 2.4917g Pr(NO 3 ) 3 ·6H 2 O, 2.5457g Fe(NO 3 ) 3 9H 2 O, 0.2976Ca(NO 3 ) 2 , 7.9442g citric acid, add ammonia water to adjust the pH to 7-10, stir the solution until it becomes clear and transparent, put the beaker on a magnetic stirrer, and heat and continue to evaporate until it turns into a gel, then put the gel in 150 Dry in an oven at ℃ for 24 hours to obtain a fluffy xerogel, which is fully ground and then put into a crucible and kept at 600℃ for 8 hours for calcination to remove organic matter. The calcined powder was ground and put into a crucible, and calcined at 950°C for 10 hours to obtain Ce 0.9 PR 0.1 o 2-δ -Pr 0.8 Ca 0.2 FeO 3-δ The powder is pressed at 10MPa to obtain a cake-shaped sheet, and the sheet is slowly heated at 1400°C for 5 hours to sinter to obtain a dense dual-phase ceramic oxygen-permeable membrane material, and sanded to obtain a calcium-containing mixed conductor with good stabil...

Embodiment 3

[0032] Accurately weigh 2.6072g Ce(NO 3 ) 3 ·6H 2 O, 2.0418g Pr(NO 3 ) 3 ·6H 2 O, 2.6820g Fe(NO 3 ) 3 9H 2 O, 0.6334Ca(NO 3 ) 2 , 8.3696g citric acid, add ammonia water to adjust the pH to 7-10, stir the solution until it becomes clear and transparent, put the beaker on a magnetic stirrer, and heat and continue to evaporate until it turns into a gel, then put the gel in 150 Dry in an oven at ℃ for 24 hours to obtain a fluffy xerogel, which is fully ground and then put into a crucible and kept at 600℃ for 8 hours for calcination to remove organic matter. The calcined powder was ground and put into a crucible, and calcined at 950°C for 10 hours to obtain Ce 0.9 PR 0.1 o 2-δ -Pr 0.6 Ca 0.4 FeO 3-δ The powder is pressed at 10MPa to obtain a cake-shaped sheet, and the sheet is slowly heated at 1400°C for 5 hours to sinter to obtain a dense dual-phase ceramic oxygen-permeable membrane material, and sanded to obtain a calcium-containing mixed conductor with good stabil...

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Abstract

The invention designs and prepares a calcium-containing double-phase mixed conductor oxygen permeation membrane material, and belongs to the technical field of inorganic functional ceramic manufacturing. The general formula of the double-phase mixed conductor oxygen permeation membrane material is Ce<0.9>Pr<0.1>O<2-delta>-Pr<1-x>Ca<x>FeO<3-delta>(CPO-P<1-x>C<x>FO; 0<=x<=1.0). The preparation method comprises the following steps: preparing required powder by a one-pot sol-gel method, calcining the powder in a muffle furnace at 950 DEG C for 12 hours to obtain a precursor, and tabletting and sintering the powder to obtain the finally required mixed conductor oxygen permeation membrane. The mixed conductor oxygen permeation membrane material with good stability is obtained by regulating and controlling the ratio of the Pr element with multivalent state to the Ca element with +2 valence and lower price cost. The membrane material prepared by the invention shows good stability in a low-oxygen and corrosive atmosphere. The oxygen source can be used as a novel oxygen source to be applied to the high-temperature complex atmosphere oxygen industry, such as the fields of oxygen-enriched combustion, water decomposition and methane coupling.

Description

technical field [0001] The invention belongs to the technical field of functional ceramics manufacturing, in particular to a chemical composition Ce 0.9 PR 0.1 o 2-δ -Pr 1- x Ca x FeO 3-δ Two-phase mixed conductor oxygen-permeable membrane material and its preparation method. Background technique [0002] Oxygen-permeable membranes with dense mixed ion-electronic conductors have attracted much attention due to their rich properties and their great potential for future applications in the energy industry. For example, it can be used for the separation and purification of oxygen, the cathode material of solid oxide fuel cells, oxygen-rich combustion, water splitting and methane coupling, etc. However, the applications of these materials are often limited by their poor thermal and mechanical stability. In particular, some systems containing alkali metal elements such as Ba and Sr will degrade in a carbon dioxide atmosphere to form carbonate by-products. The generation ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/50C04B35/622C04B35/64
CPCC04B35/50C04B35/62218C04B35/64C04B2235/3272C04B2235/443C04B2235/6562C04B2235/6565C04B2235/96
Inventor 罗惠霞王晓鹏谢沚昂曾令勇何溢懿
Owner SUN YAT SEN UNIV