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A dual-phase ceramic material of homologous double perovskite and its preparation method and application

A ceramic material, double perovskite technology, applied in the application field of hydrogen separation materials, can solve the problems of high tension of materials, difficult to meet application conditions, unable to operate stably, and achieve the effect of low cost and simple process

Active Publication Date: 2017-09-29
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, since the proton-conducting phase and the electron-conducting phase of this dual-phase membrane system are two different materials, metal and ceramic, respectively, their thermal expansion coefficients are very different, so a large tension will be generated inside the material at high temperature. As a result, the material is prone to cracks and breakage, and cannot be operated stably at high temperature for a long time, so it is difficult to meet the actual application conditions

Method used

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  • A dual-phase ceramic material of homologous double perovskite and its preparation method and application
  • A dual-phase ceramic material of homologous double perovskite and its preparation method and application
  • A dual-phase ceramic material of homologous double perovskite and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] A preparation method of a homologous double perovskite dual-phase ceramic material, specifically comprising the following steps:

[0043] (1) 12.47g SrCO 3 , 11.63 g CeO 2 and 1.91g Y 2 o 3 Dissolve in 25ml of acetone, ball mill at 800r / min for 24h, and then stand at 60°C for 14h to obtain the proton conductive phase SrCe 0.8 Y 0.2 o 3-δ The precursor of the powder; the precursor is placed in a muffle furnace and raised to 1000°C at a heating rate of 2°C / min, kept for 10 hours, and then lowered to room temperature at a cooling rate of 2°C / min to obtain the protons of the perovskite conductive phase;

[0044] (2) 10.59g SrCO 3 , 1.23g CeO 2 and 12.72g Yb 2 o 3 Dissolve in 25ml of acetone, ball mill at 800r / min for 24 hours, and then stand at 60°C for 14 hours to obtain the electronically conductive phase SrCe 0.1 Yb 0.9 o 3-δ The precursor of the powder; the precursor is placed in a muffle furnace and raised to 1000°C at a heating rate of 2°C / min, kept for 1...

Embodiment 2

[0055] A preparation method of a homologous double perovskite dual-phase ceramic material, specifically comprising the following steps:

[0056] (1) 15.56g BaCO 3 , 10.85g CeO 2 and 3.02g Er 2 o 3 Dissolve in 25ml of acetone, ball mill at 400r / min for 24h, and then stand at 80°C for 10h to obtain the proton conductive phase BaCe 0.8 Er 0.2 o 3-δ The precursor of the powder; the precursor is placed in a muffle furnace and raised to 1200°C at a heating rate of 2°C / min, kept for 10 hours, and then lowered to room temperature at a cooling rate of 2°C / min to obtain the protons of the perovskite conductive phase;

[0057] (2) 14.59g BaCO 3 , 2.55g CeO 2 and 10.31g Sm 2 o 3 Dissolve in 25ml of acetone, ball mill at 400r / min for 24h, and then stand at 80°C for 10h to obtain the electronically conductive phase BaCe 0.2 SM 0.8 o 3-δ The precursor of the powder; the precursor is placed in a muffle furnace and raised to 1200°C at a heating rate of 2°C / min, kept for 10 hours, ...

Embodiment 3

[0064] A preparation method of a homologous double perovskite dual-phase ceramic material, specifically comprising the following steps:

[0065] (1) 9.56g SrCO 3 , 10.59 g CeO 2 and 0.57g Eu 2 o 3 Dissolve in 20ml of acetone, ball mill at 800r / min for 24h, and then stand at 80°C for 10h to obtain the proton conductive phase SrCe 0.95 Eu 0.05 o 3-δ The precursor of the powder; the precursor is placed in a muffle furnace and raised to 900°C at a heating rate of 2°C / min, kept for 10 hours, and then lowered to room temperature at a cooling rate of 2°C / min to obtain the protons of the perovskite conductive phase;

[0066] (2) 10.59g SrCO 3 , 1.23g CeO 2 and 12.72g Yb 2 o 3 Dissolve in 20ml of acetone, ball mill at 800r / min for 24h, and then stand at 80°C for 10h to obtain the electronically conductive phase SrCe 0.1 Yb 0.9 o 3-δ The precursor of the powder; the precursor is placed in a muffle furnace and raised to 900°C at a heating rate of 2°C / min, kept for 15 hours, ...

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Abstract

The invention belongs to the technical field of application of hydrogen separation materials, and discloses a dual-phase ceramic material of homologous double perovskite, a preparation method and application thereof. The material is prepared from a proton-conducting phase and an electron-conducting phase, and both the proton-conducting phase and the electron-conducting phase are perovskite ceramic materials. The method is (1) weighing the raw materials of the proton-conducting phase and the raw materials of the electron-conducting phase according to the stoichiometric ratio, respectively adding organic solvents, ball milling, pretreatment, and roasting to obtain the proton-conducting phase and the electron-conducting phase; (2) Mix the proton conductive phase and the electronic conductive phase, add an organic solvent, ball mill, and then place it in a mold to form a green embryo; put the green embryo in a furnace, raise the temperature to 1300℃~1500℃, keep it warm for 10~20h, and cool down , to obtain a dual-phase ceramic material of homologous double perovskite. The prepared dual-phase ceramic material has good chemical stability and thermal stability, high hydrogen permeability, and is suitable for long-term industrial practical operation reactions.

Description

technical field [0001] The invention belongs to the technical field of application of hydrogen separation materials, and relates to new functional materials, in particular to a homologous double perovskite dual-phase ceramic material and its preparation method and application. The homologous double perovskite ceramic material obtains high High hydrogen permeability and good compatibility and stability. Background technique [0002] Dual-phase ceramic materials refer to a new class of ceramic materials that have both proton conductivity and electron conductivity. This material has mixed proton-electron conductivity at high temperature (especially at a temperature higher than 600°C), so it has 100% selective permeability for hydrogen, and can be converted from methane or coal conversion reactants at high temperature. Hydrogen is efficiently separated. This technology can be directly used in coal combustion plants, at 900 °C from syngas (CO+H 2 ) in the separation of hydroge...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/50C04B35/505C04B35/626
Inventor 王海辉程顺凡王艳杰陈艳
Owner SOUTH CHINA UNIV OF TECH
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