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Mixed conductor hydrogen permeation membrane containing Zr system and Tm system perovskite and preparation method and application thereof

A technology of mixed conductors and hydrogen permeable membranes, applied in separation methods, semipermeable membrane separations, chemical instruments and methods, etc., can solve problems such as poor mechanical stability, achieve high mechanical properties, high proton conductivity and mechanical stability, The effect of high proton conductivity

Inactive Publication Date: 2009-12-30
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

doped SrCeO 3 Perovskite-type compounds exhibit good proton conductivity, but poor mechanical stability

Method used

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  • Mixed conductor hydrogen permeation membrane containing Zr system and Tm system perovskite and preparation method and application thereof
  • Mixed conductor hydrogen permeation membrane containing Zr system and Tm system perovskite and preparation method and application thereof
  • Mixed conductor hydrogen permeation membrane containing Zr system and Tm system perovskite and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Preparation of 0.1mol SrCe by EDTA-citric acid joint complexation 0.85 Zr 0.10 T m 0.05 o 3-δ Powder: weigh 0.05molSr(NO 3 ) 2 , 0.0425mol Ce(NO 3 ) 4 , 0.005mol Zr(NO 3 ) 3 2H 2 O, 0.0025mol Tm (NO 3 ) 3 ·6H 2 Dissolve the four raw materials in 250ml of distilled water, put them into a heat-resistant beaker and stir for 30min, then add 0.1mol EDTA and stir for 30min, then add 0.15mol of citric acid, stir for 30min, add analytical reagent NH 3 ·H 2 O adjust the pH of the mixed solution to 8, heat and evaporate the mixed solution at 100°C to form a gel, and finally sinter the gel at 1000°C for 8 hours to obtain SrCe 0.85 Zr 0.1 T m 0.05 o 3-δ Powder, the obtained powder was subjected to phase analysis, the results are as attached figure 1shown. The diaphragm was prepared by static tableting method, 0.44g of perovskite oxide powder was placed in a stainless steel mold with an inner diameter of 1.6mm, kept at 20MPa for 10min, the diaphragm was obtained un...

Embodiment 2

[0034] Preparation of 0.1mol SrCe by EDTA-citric acid joint complexation 0.75 Zr 0.20 T m 0.05 o 3-δ Powder: weigh 0.05molSr(NO 3 ) 2 , 0.0375mol Ce(NO 3 ) 4 , 0.01mol Zr(NO 3 ) 3 2H 2 O, 0.0025mol Tm (NO 3 ) 3 ·6H 2 Dissolve the four raw materials in 250ml distilled water, put them into a heat-resistant beaker and stir for 30min, then add 0.1mol EDTA and stir for 30min, then add 0.15mol citric acid and stir for 30min, add analytical reagent NH 3 ·H 2 O adjust the pH of the mixed solution to 8, heat and evaporate the mixed solution at 100°C to form a gel, and finally sinter the gel at 1000°C for 8 hours to obtain SrCe 0.75 Zr 0.2 T m 0.05 o 3-δ Powder, the obtained powder was subjected to phase analysis, the results are as attached figure 1 shown. The diaphragm was prepared by static tableting method, 0.44g of perovskite oxide powder was placed in a stainless steel mold with an inner diameter of 1.6mm, kept at 20MPa for 10min, the diaphragm was obtained under...

Embodiment 3

[0036] Preparation of 0.1mol SrCe by EDTA-citric acid joint complexation 0.65 Zr 0.30 T m 0.05 o 3-δ Powder: weigh 0.05molSr(NO 3 ) 2 , 0.0325mol Ce(NO 3 ) 4 , 0.015mol Zr(NO 3 ) 3 2H 2 O, 0.0025mol Tm (NO 3 ) 3 ·6H 2 Dissolve the four raw materials in 250ml distilled water, put them into a heat-resistant beaker and stir for 30min, then add 0.1mol EDTA and stir for 30min, then add 0.15mol citric acid and stir for 30min, add analytical reagent NH 3 ·H 2 O adjust the pH of the mixed solution to 8, heat and evaporate the mixed solution at 100°C to form a gel, and finally sinter the gel at 1000°C for 8 hours to obtain SrCe 0.65 Zr 0.3 T m 0.05 o 3-δ Powder, the obtained powder was subjected to phase analysis, the results are as attached figure 1 shown. The diaphragm was prepared by static tableting method, 0.44g of perovskite oxide powder was placed in a stainless steel mold with an inner diameter of 1.6mm, kept at 20MPa for 10min, the diaphragm was obtained unde...

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Abstract

The invention discloses a mixed conductor hydrogen permeation membrane containing Zr system and Tm system perovskite and a preparation method and an application thereof; the chemical formula of the hydrogen permeation membrane is SrCe0.95-xZrxTm0.05O3-delta; wherein, x is not less than 0.1 and not more than 0.40 and delta is not less than 0 and not more than 0.5. The preparation method comprises the following steps: preparing a precursor by EDTA-citric acid combination complexometry, sintering at 1000 DEG C for 7-10h to obtain powder, pressing the powder at 10-40MPa to obtain membranes by stationary method and finally roasting the membranes at 1100-1525 DEG C to obtain the mixed conductor hydrogen permeation membrane containing Zr system and Tm system perovskite. The hydrogen permeation membrane is perovskite oxide which is doped with Zr and Tm at the same time, has higher hydrogen permeability and high stability in reducing atmosphere and can be used for separating hydrogen from a mixed gas containing hydrogen.

Description

technical field [0001] The invention relates to a hydrogen-permeable membrane containing zirconium and thulium series perovskite mixed conductors, which can be used to separate and prepare pure hydrogen from hydrogen-containing mixed gas, especially from air. Background technique [0002] Mixed conductor hydrogen permeable membranes are a class of ceramic membranes with both electronic and proton conductivity. Since hydrogen is not transmitted in the form of molecular hydrogen but in the form of proton hydrogen through oxygen holes in the process of hydrogen permeation, the theoretical diffusion selectivity for hydrogen is 100%, and the hydrogen permeation of some materials is related to the micropores. The permeation capacity of the membrane is comparable. Since the mid-1980s, Professor H.Iwahara was the first to doped SrCeO with a perovskite structure. 3 Since the hydrogen permeable performance of oxide series hydrogen permeable membrane materials has been systematically...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/02B01D53/22C01B3/50
Inventor 袁文辉毛玲玲李莉
Owner SOUTH CHINA UNIV OF TECH
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