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Multi-phase ion-electron mixing conductor powder material, manufacturing method and application thereof

A technology of mixing conductors and powder materials, applied in the direction of non-metallic conductors, circuits, electrical components, etc., can solve problems such as single, few, and impossible

Inactive Publication Date: 2008-07-16
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

From the perspective of application, there are still not many membrane material systems to choose from, and the existing membrane materials still have problems such as low thermal stability and low chemical stability.
[0004] Oxygen-permeable membrane materials currently reported for partial oxidation of methane, such as BSCF / LSCF / SCF, etc., can only be used in coke oven gas experiments due to a single partial oxidation atmosphere of methane, and most of them have relatively low stability. Poor disadvantages, cracks often occur during the experiment and the experiment cannot be carried out

Method used

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  • Multi-phase ion-electron mixing conductor powder material, manufacturing method and application thereof
  • Multi-phase ion-electron mixing conductor powder material, manufacturing method and application thereof

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Embodiment 1

[0029] Example 1: Preparation of complex ion-electronic mixed conductor powder material

[0030] According to the chemical formula BaCo x Fe y Nb z o 3-δ , where x=0.7, y=0.2, z=0.1; the dopant is ZrO 2 , its doping amount is 2.5%, 5%, 7.5% and 10% relative to the mass fraction of BCFN; the specific steps are as follows:

[0031] 1. Weigh 395g of BaCO respectively 3 , 116g of Co 2 o 3 , 32g of Fe 2 o 3 and 26.6 g of Nb 2 o 5 , mix each raw material with ethanol or water as a dispersant ball mill, mix evenly and dry, then bake at 1000°C-1150°C for 10-20 hours, and then dry by ball mill to get BaCo x Fe y Nb z o 3-δ doped powder;

[0032] 2. Mix 100g of BCFN powder obtained in step 1 with 2.5g, 5g, 7.5g and 10g of dopant ZrO 2 , after ball milling and mixing for 1-2 hours; mixed powder is obtained;

[0033] 3. Pressure-form the mixed powder obtained in step 2 into a diaphragm green body, heat up to 1150°C for 20 hours at a heating rate of 5°C / min, and sinter at ...

Embodiment 2

[0035] Embodiment 2: the different ZrO obtained in embodiment 1 2 The doped BCFN material was subjected to a TG experiment under an argon atmosphere, as shown in Figure 2. It can be seen from the figure that there are obvious differences in the weight loss of different samples under this atmosphere. The weight loss of samples with doping amount of 0wt% and 2.5wt% is similar, reaching 0.929% at 770℃. The weight loss of 5wt% and 7.5wt% is similar, reaching 0.776% at 770°C, and the weight loss of the 10wt% sample is the smallest, reaching 0.561% at 770°C. The change in weight loss of doped samples between 400°C and 770°C is different on both sides of 570°C; the weight loss rate is faster between 400°C and 570°C, and the weight loss rate is relatively slow between 570°C and 770°C. The sudden change in the weight loss curve of the ℃ material may be caused by a large amount of desorption of internal lattice oxygen resulting in a change in the material structure, corresponding to th...

Embodiment 3

[0036] Embodiment 3: the different ZrO obtained in embodiment 1 2 After the doped sample was treated with 40% hydrogen, the phase structure changed obviously. It can be seen from the peak intensity variation of the strongest peak of the BCFN phase in different doped samples in Figure 3 that the doped samples of 7.5wt% and 10wt% are more stable under hydrogen than other samples. Although the pure BCFN sample retains part of the perovskite phase structure, the decomposition is serious. Except for the residual perovskite structure diffraction peak, only the diffraction peak of BaFeO3 is detected, because other impurity phases are too many and messy, so it is impossible to make fine According to the analysis, it is estimated that the impurity phase is mainly composed of CoO, Co, FeO and Fe2o3. For samples with different doping amounts, the diffraction peaks of the perovskite structure gradually become more obvious as the ZrO2 doping amount increases, indicating that the structura...

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Abstract

The invention relates to a multi-phase ionic-electronic mixture conductor material and a preparation method and the application thereof. A first phase of the conductor material is BaCoxFeyNbzO3-Delta, that is BCFN, wherein x, y, and z represent mole fractions, x is no less than to 0 and no more than 0.9, y is no less than 0 and no more than 0.9, z is no less than 0 and no more than 0.3, and x plus y and plus z is no less than 0.95 and no more than 1.1; a second phase is dopant ZrO2, Al2O3 or SnO2, wherein the mole fraction of the dopant corresponding to the BCFN is no more than 20 percent. The invention adopts a method of doping modification to obtain the multi-phase ionic-electronic mixture conductor material which has good structural stability in inert atmosphere and strong reducing atmosphere, and excellent oxygen permeation performance in oxidation test of methane in COG (coke oven gas); at the same time, the material has oxygen ion conductivity and electron conductivity performance with high stability, which is a mixture conductive material. Therefore the material can be used not only as membrane material of optionally separated oxygen from oxygen mixture gas, but also as an electrode material of a fuel cell of solid oxide and an oxygen sensor, and the film is called the mixture conductive oxygen permeable film. The material is used in a film reactor to dynamically provide oxygen for high-temperature oxidation reactions such as partial oxidation of methane for preparing syngas (POM) and oxidative coupling of methane (OCM); the invention can simplify the operation process and reduce the operation cost.

Description

technical field [0001] The invention relates to a composite ion-electronic mixed conductor powder material, a preparation method and application thereof. technical background: [0002] Membrane reactors composed of densely mixed conductive oxygen-permeable membrane materials are very active in the partial oxidation of natural gas methane. These works are mainly concentrated in major national key laboratories in the United States and major oil and gas companies, including research groups led by companies such as Air Products and Ceramatec, which are funded by the US Department of Energy to conduct hybrid conductive ceramics for methane conversion. Research on membrane technology; and research groups composed of Amoco, BP, Praxair, Statoil, Phillips Petroleum, Sasol and other companies are also carrying out similar work. [0003] For dense mixed conductive oxygen-permeable membrane materials, improving the oxygen permeability of the membrane and solving the stability of the m...

Claims

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Application Information

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IPC IPC(8): C04B35/01C04B35/32C04B35/622H01B1/06H01M4/52
CPCY02E60/10
Inventor 李淼甄强张旭丁超丁伟中
Owner SHANGHAI UNIV
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