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A method for improving the structural stability of baco0.7fe0.2nb0.1o3-δ oxygen permeable membrane material

A material structure, oxygen-permeable membrane technology, applied in semi-permeable membrane separation, chemical instruments and methods, membrane technology, etc., can solve the problems of low mechanical strength, poor structural stability, coarse grains, etc. Structural stability, the effect of improving anti-reduction ability

Inactive Publication Date: 2011-12-28
UNIV OF SCI & TECH BEIJING
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But studies have shown that BaCo 0.7 Fe 0.2 Y 0.1 o 3-δ with BaCo 0.7 Fe 0.2 In 0.1 o 3-δ The structural stability under hypoxic conditions is worse than that of BaCo 0.7 Fe 0.2 Nb 0.1 o 3-δ ;BaCo 0.7 Fe 0.2 sn 0.1 o 3-δ Although it has good performance in terms of structural stability, its grains are coarse and its mechanical strength is low

Method used

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  • A method for improving the structural stability of baco0.7fe0.2nb0.1o3-δ oxygen permeable membrane material
  • A method for improving the structural stability of baco0.7fe0.2nb0.1o3-δ oxygen permeable membrane material
  • A method for improving the structural stability of baco0.7fe0.2nb0.1o3-δ oxygen permeable membrane material

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Experimental program
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Effect test

Embodiment 1

[0018] Synthesis of Ba by solid phase reaction 0.9 Sr 0.1 co 0.7 Fe 0.2 Nb 0.1 o 3-δ Dense samples. with BaCO 3 , SrCO 3 , CoCH 3 COOH, Fe 2 o 3 , Nb 2 o 5 As a raw material, a mixture is prepared according to the stoichiometric ratio of the elements of each component. The mixture was fully milled in an agate ball mill jar with alcohol as the medium for 10 hours, and then dried in an oven. After the dried mixture is ground and sieved, the powder is pre-fired at 900° C. for 10 hours. The block produced by calcination was ground in an agate mortar, and then placed in a ball mill jar with alcohol as a medium for ball milling for 5 hours, and then put into a drying oven to dry for 10 hours. Grind the dried ingredients evenly, add an appropriate amount of PVA with a concentration of 1.0wt.%, mix evenly, and then press it into a diaphragm and a rectangular strip in a stainless steel abrasive tool with a pressure of 100 MPa. Then the green body was sintered at 1150°C f...

Embodiment 2

[0020] Synthesis of Ba by solid phase reaction 0.6 Sr 0.4 co 0.7 Fe 0.2 Nb 0.1 o 3-δ Dense samples. The synthetic materials and preparation process are as described in Example 1. The main process parameters in the preparation process are: the mixture powder after ball milling, drying, grinding and sieving is pre-fired at 1000°C for 10 hours; the green body after pressing is sintered at 1225°C for 10 hours to obtain a dense sample ; The heating and cooling rates of the sample in the high temperature furnace are both 3°C / min.

[0021] Analysis of Ba by XRD 0.9 Sr 0.1 co 0.7 Fe 0.2 Nb 0.1 o 3-δ 、Ba 0.8 Sr 0.2 co 0.7 Fe 0.2 Nb 0.1 o 3-δ 、Ba 0.7 Sr 0.3 co 0.7 Fe 0.2 Nb 0.1 o 3-δ and Ba 0.6 Sr 0.4 co 0.7 Fe 0.2 Nb 0.1 o 3-δ The phase structure composition, the result is as follows figure 1 shown. The test results show that the oxygen-permeable membrane materials in each ratio form a single cubic perovskite structure. This shows that the Sr element in...

Embodiment 3

[0023] Test the oxygen permeable membrane material BaCo 0.7 Fe 0.2 Nb 0.1 o 3-δ And Ba after doping Sr element in it 0.6 Sr 0.4 co 0.7 Fe 0.2 Nb 0.1 o 3-δ Phase structure stability under high temperature and low oxygen partial pressure conditions. BaCo 0.7 Fe 0.2 Nb 0.1 o 3-δ with Ba 0.6 Sr 0.4 co 0.7 Fe 0.2 Nb 0.1 o 3-δ The diaphragm is put into a porcelain boat, and the porcelain boat is placed in a tube furnace with both ends sealed. One end of the furnace tube is fed with pure argon gas, and the other end is connected with a conduit to lead into water, and the gas flow rate is controlled at about 100ml / min. The heat treatment system during the test is: 5°C / min to 850°C; then slowly rise the temperature from 850°C to 900°C for 10 hours; then quench the diaphragm into ice-salt water with a molar concentration of 5%, and use XRD to characterize it Changes in the phase structure of the membrane surface. The result is as figure 2 Shown, BaCo 0.7 Fe 0.2 ...

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Abstract

A method for improving the structural stability of a BaCo0.7Fe0.2Nb0.1O3-δ oxygen-permeable membrane material belongs to the technical field of oxygen-permeable membranes. The present invention is characterized in that: BaCo0.7Fe0.2Nb0.1O3-δ base material with perovskite structure is doped with Sr element, and the chemical formula of the obtained oxygen-permeable membrane material is Ba1-xSrxCo0.7Fe0.2Nb0.1O3-δ, Wherein x=0.05~0.4. The oxygen-permeable membrane material provided by the method of the present invention significantly improves the phase structure stability of the BaCo0.7Fe0.2Nb0.1O3-δ matrix material under high temperature and low oxygen partial pressure conditions, so that the improved oxygen-permeable membrane material can be used in a wider range It can be applied in the range of oxygen partial pressure and larger oxygen concentration gradient.

Description

technical field [0001] The invention belongs to the technical field of oxygen-permeable membranes, and in particular relates to a method for improving BaCo 0.7 Fe 0.2 Nb 0.1 o 3-δ Methods for structural stability of oxygen permeable membrane materials. Background technique [0002] Hydrogen energy is a secondary energy source and can only be obtained by transforming other energy sources. Although there are many ways to produce hydrogen, the mature methods available for large-scale hydrogen production in the world are mainly water electrolysis and hydrogen production from fossil energy (coal, natural gas and liquid fossil energy). For hydrogen production by water electrolysis, although the investment cost is low and the process equipment is relatively simple, the operating cost is high. Hydrogen production from natural gas is a cost-effective method. This method is usually achieved by partial oxidation of methane, the main component of natural gas. The traditional meth...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D71/02C04B35/495C04B35/622C01B3/36
Inventor 赵海雷李原徐南生李福燊丁伟中卢雄刚
Owner UNIV OF SCI & TECH BEIJING
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