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bafeo doped with ca element at b site 3-δ Ceramic based oxygen permeable membrane material

A bafeo3-, bafe1-xcaxo3- technology, applied in the field of inorganic oxygen permeable membrane materials, can solve the problems of high valence, reduce the concentration of oxygen vacancies in the material, increase the production cost of materials, etc., and achieve the goal of improving oxygen permeability and reducing costs Effect

Active Publication Date: 2016-09-07
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Researchers usually choose rare earth metals with larger radii as A and B doping elements. Although the doping of such elements improves the structural stability of the material, they usually have a higher valence state, which reduces the concentration of oxygen vacancies in the material, and does not It is beneficial to improve the oxygen permeability of the material
Moreover, the price of rare earth metal element materials is generally relatively high, which increases the production cost of materials

Method used

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  • bafeo doped with ca element at b site <sub>3-δ</sub> Ceramic based oxygen permeable membrane material
  • bafeo doped with ca element at b site <sub>3-δ</sub> Ceramic based oxygen permeable membrane material
  • bafeo doped with ca element at b site <sub>3-δ</sub> Ceramic based oxygen permeable membrane material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Example 1: BaFe 0.975 Ca 0.025 o 3- δ Citric acid-nitrate synthesis

[0016] a) 10.454g BaNO 3 , 15.756gFe(NO 3 ) 3 9H 2 O, 0.236gCa(NO 3 ) 2 4H 2 O was dissolved in 500 mL of ionized water, and 50 mL of 65 wt% HNO was added 3 , and stirred for 2 hours.

[0017] b) Add 23.379g of ethylenediaminetetraacetic acid and 25.217g of citric acid to the above solution, adjust the pH value of the solution to 5 with 28wt% ammonia water, and stir for 12 hours.

[0018] c) Subsequently, the mixed solution was evaporated in a water bath at 60° C. to obtain a colloid, and the colloid was moved to an oven and ignited at 200° C. to obtain a precursor powder.

[0019] d) Treat the precursor 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 100MPa . The dense samples were obtained by sintering at 1300℃ for 6h in air atmosphere. S...

Embodiment 2

[0020] Example 2: BaFe 0.95 Ca 0.05 o 3- δ Citric acid-nitrate synthesis

[0021] a) 10.454g BaNO 3 , 15.352gFe(NO 3 ) 3 9H 2 O, 0.472gCa(NO 3 ) 2 4H 2 O was dissolved in 500 mL of ionized water, and 50 mL of 65 wt% HNO was added 3 , and stirred for 2 hours.

[0022] b) Add 23.379g of ethylenediaminetetraacetic acid and 25.217g of citric acid to the above solution, adjust the pH value of the solution to 7 with 28wt% ammonia water, and stir for 12 hours.

[0023] c) Subsequently, the mixed solution was evaporated in a water bath at 100° C. to obtain a colloid, and the colloid was moved to an oven and ignited at 300° C. to obtain a precursor powder.

[0024] d) Treat the precursor in an air atmosphere at 700°C for 8 hours. After cooling to room temperature, transfer it to a mortar, add 3wt.% PVA and mix evenly. Use a mold to dry press the mixed precursor under a pressure of 150MPa . Sintering at 1350°C for 6 hours in an air atmosphere gave a dense sample without in...

Embodiment 3

[0025] Example 3: BaFe 0.90 Ca 0.10 o 3- δ Citric acid-nitrate synthesis

[0026] a) 10.454g BaNO 3 , 14.544gFe(NO 3 ) 3 9H 2 O, 0.944gCa(NO 3 ) 2 4H 2 O was dissolved in 500 mL of ionized water, and 50 mL of 65 wt% HNO was added 3 , and stirred for 2 hours.

[0027] b) Add 23.379g of ethylenediaminetetraacetic acid and 25.217g of citric acid to the above solution, adjust the pH value of the solution to 10 with 28wt% ammonia water, and stir for 12 hours.

[0028] c) Subsequently, the mixed solution was evaporated in a water bath at 90° C. to obtain a colloid, and the colloid was moved to an oven and ignited at 200° C. to obtain a precursor powder.

[0029] d) Treat the precursor in an air atmosphere at 900°C for 8 hours. After cooling to room temperature, transfer it to a mortar, add 5wt.% PVA and mix evenly. Use a mold to dry press the mixed precursor under a pressure of 200MPa . Such as image 3 As shown, sintering at 1150°C for 6 hours in an air atmosphere yie...

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Abstract

The invention discloses a kind of BaFeO doped with Ca element at the B site 3‑δ The invention relates to a ceramic-based oxygen-permeable membrane material and relates to an inorganic oxygen-permeable membrane material. Its invention is characterized in that: for perovskite BaFeO 3‑δ Materials, for the first time doped Ca with a large radius and low valence state at the B site 2+ ions to improve the structural stability of the material. The "lattice stress effect" is used to increase the oxygen vacancy concentration of the material and improve the oxygen permeability of the material. At the same time, the Ca-containing raw material is cheaper than other rare earth metal element dopants, which can effectively control the production cost of the oxygen-permeable material. Molecular formula is BaFe 1‑ x Ca x o 3‑δ , where x=0.02‑0.5. The present invention prepares B-site doped Ca 2+ Element's low-cost oxygen-permeable membrane material has a compact structure, high oxygen permeability and good structural stability. It is an oxygen-permeable membrane material with excellent performance and can be applied to continuous oxygen supply for partial oxidation of methane and other oxygen-containing gases. Industrial process for oxygen separation and purification in China.

Description

technical field [0001] The invention relates to an inorganic oxygen-permeable membrane material, in particular to a BaFeO doped with Ca element at the B site 3- δ Base ceramic oxygen permeable membrane material and preparation method. Background technique [0002] In the past ten years, ceramic oxygen-permeable membrane materials have aroused people's great interest. Such membranes have very high oxygen permeability at high temperatures, and can be used as gas separation membranes to separate and produce oxygen from oxygen-containing gases, so they can be widely used Used for pure oxygen production, partial oxidation of methane to synthesis gas (CO / H 2 ), solid oxide fuel cell power generation, oxygen-enriched combustion and other processes. Compared with the traditional method of preparing synthesis gas by catalytic fixed bed, the method of partial oxidation of methane with oxygen permeable membrane reactor can complete the separation of oxygen and the catalytic reaction...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D71/02B01D67/00C04B35/26C04B35/622
Inventor 赵海雷卢瑶杜雪飞杨婧
Owner UNIV OF SCI & TECH BEIJING
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