Preparation method of bimetallic oxide, bimetallic oxide and application

A bimetallic oxide and bimetallic technology, applied in the direction of metal/metal oxide/metal hydroxide catalyst, rare earth metal oxide/hydroxide, rare earth metal compound preparation/treatment, etc., can solve the problem of metal oxidation Problems such as powder particle size, electrical conductivity, catalytic activity, uneven composite metal oxide powder, large grain size, etc., to reduce the number of crystallization nuclei, improve the degree of porosity and specific surface area, and prevent the pre-calcination temperature from being too high Effect

Pending Publication Date: 2021-11-26
ANSTEEL BEIJING RES INST
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  • Description
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Problems solved by technology

[0005] The present invention is based on the inventor's discovery and understanding of the following facts and problems: in order to solve the problem of uneven and excessive grain size of the composite metal oxide powder prepared by the coprecipitation method, most researchers believe that it is due to the solution It is easy to form local overconcentration during the process of dropping the precipitant or metal salt solution, but the inventors found that the subsequent calcination of the precipitate is also an important step that affects the particle size, electrical conductivity, and catalytic activity of the metal oxide powder.

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  • Preparation method of bimetallic oxide, bimetallic oxide and application
  • Preparation method of bimetallic oxide, bimetallic oxide and application
  • Preparation method of bimetallic oxide, bimetallic oxide and application

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preparation example Construction

[0025] A method for preparing a double metal oxide according to an embodiment of the present invention includes the following steps:

[0026] A, preparation samarium, cerium metal element mol ratio are (0.9-1.1): the bimetallic solution of 4;

[0027] b. Under stirring conditions, add ammonia water to the bimetallic solution to generate co-precipitates and separate them;

[0028] c. Drying, pre-calcining, calcining and cooling the co-precipitate in sequence, wherein the calcining temperature is 550-650°C.

[0029] According to the preparation method of a double metal oxide according to the embodiment of the present invention, 1. The precipitate obtained by the preparation method of the embodiment of the present invention is the precursor of the double metal oxide. Since ammonia water is used as the precipitant, part of the ammonia is accompanied by metal hydrogen The oxide precipitates and dissolves in the free water in the precursor. In the preparation method of the embodime...

Embodiment 1

[0047] a. According to the molar ratio of samarium and cerium metal elements being 1:4, weigh a considerable amount of Sm(NO 3 ) 3 ·6H 2 O, Ce(NO 3 ) 3 ·6H 2 O was dissolved in water respectively to obtain a samarium nitrate solution and a cerium nitrate solution, and the samarium nitrate solution was added dropwise to the cerium nitrate solution, and the cerium nitrate solution was continuously stirred at room temperature with a magnetic stirrer during the dropping process until the formation of Transparent and clear mixed solution, after continuous stirring for 2 hours, add dispersant dropwise at a rate of 10-12 drops / min directly above the stirring center, the molar ratio of dispersant to the total amount of bimetallic ions is 1:38, and bimetallic solution;

[0048] b. After adding the dispersant dropwise and stirring for 10 minutes, add 0.1mol / L ammonia water dropwise to the bimetallic solution under stirring conditions, and a milky white precipitate appears. Stop add...

Embodiment 2

[0051] a. According to the molar ratio of samarium and cerium metal elements being 1:4, weigh a considerable amount of Sm(NO 3 ) 3 ·6H 2 O, Ce(NO 3 ) 3 ·6H 2 O was dissolved in water respectively to obtain a samarium nitrate solution and a cerium nitrate solution, and the samarium nitrate solution was added dropwise to the cerium nitrate solution, and the cerium nitrate solution was continuously stirred at room temperature with a magnetic stirrer during the dropping process until the formation of Transparent and clear mixed solution, after continuous stirring for 2 hours, add dispersant dropwise at a rate of 10-12 drops / min directly above the stirring center, the molar ratio of dispersant to the total amount of bimetallic ions is 1:45, to obtain bimetallic solution;

[0052] b. After adding the dispersant dropwise and stirring for 10 minutes, add 0.1mol / L ammonia water dropwise to the bimetallic solution under stirring conditions, and a milky white precipitate appears. St...

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Abstract

The invention relates to the technical field of metal oxides, in particular to a bimetallic oxide preparation method, a bimetallic oxide and application. The preparation method of the bimetallic oxide comprises the following steps: a, preparing a bimetallic solution in which the molar ratio of samarium to cerium is (0.9-1.1): 4; b, adding ammonia water into the bimetallic solution under stirring, and separating the generated co-precipitation product; and c, sequentially subjecting the co-precipitation product to drying, pre-calcination, calcination and cooling, wherein the calcination temperature ranges from 550 DEG C to 650 DEG C. By optimizing the treatment process of converting the precipitate into the metal oxide, the agglomeration of the material in the calcining process is avoided, and the crystal nuclei of the crystal grains are reduced, so that the grain size of the metal oxide crystal grains is reduced, the coarsening phenomenon of the metal oxide crystal grains is solved, and the specific surface area is increased.

Description

technical field [0001] The present invention relates to the technical field of metal oxides, in particular to a double metal oxide and a preparation method thereof, and further, to the application of the double metal oxide. Background technique [0002] Solid oxide battery is a high-efficiency energy conversion device, including two modes, solid oxide fuel cell and electrolytic cell. Solid oxide fuel cell can efficiently convert chemical energy in fuel into electrical energy, and solid oxide electrolytic cell can Efficiently convert electrical energy into chemical energy in fuel for storage, and the combined use of the two modes can realize the function of peak-shaving and valley-filling of electrical energy to adjust the balance between supply and demand of electrical energy. The main structure of a solid oxide battery consists of three parts: cathode, anode, and electrolyte. Among them, the requirements for the electrolyte material are extremely high, and the electrolyte m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F17/10C01F17/241B01J23/10B01J35/10H01M8/1246H01M8/126
CPCC01F17/10C01F17/241B01J23/10B01J35/1014H01M8/126H01M8/1246C01P2002/72C01P2006/12Y02E60/50
Inventor 彭显著张东彬滕艾均代宇
Owner ANSTEEL BEIJING RES INST
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