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Ultra-small multi-component alloy composite material, its preparation method and its application

A multi-component alloy and composite material technology, applied in the field of nanomaterials, can solve the problems of cumbersome polymer synthesis, incapable of large-scale production, uneven particle size, etc., and achieve the effect of unique activity and stability

Active Publication Date: 2020-12-25
安徽枡水新能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

There are many disadvantages in the above methods. The catalysts of the first method and the second method are all liquid-phase reduction, which are wrapped by polymers, and the mass transfer with the reactants is limited in the catalytic process, and the polymer synthesis is relatively cumbersome; the third The first synthesis method is inhomogeneous particle size, which cannot be mass-produced; the fourth synthesis method is limited by pH, and the loading capacity is relatively low; the fifth synthesis method is limited to binary alloys, and the particle size is not uniform

Method used

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  • Ultra-small multi-component alloy composite material, its preparation method and its application
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  • Ultra-small multi-component alloy composite material, its preparation method and its application

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preparation example Construction

[0036] The present application also provides a method for preparing the above-mentioned ultra-small multi-element alloy composite material, comprising the following steps:

[0037] Mix sulfur-doped mesoporous carbon, a metal salt precursor and a solvent, and dry to obtain an initial mixture; the metal salt precursor is a metal salt precursor of two or more different metal elements;

[0038] The initial mixture is heat-treated in a reducing atmosphere to obtain an ultra-small multi-element alloy composite material; the temperature of the heat treatment is 400-800°C.

[0039] The ultra-small multi-element alloy composite material provided by the application can be prepared by impregnation and heat treatment. This method is universally applicable to various metals, and the process operation is simple and easy.

[0040] Specifically, in the process of preparing ultra-small multi-element alloy composite materials, the applicant first mixes sulfur-doped mesoporous carbon, metal salt...

Embodiment 1

[0052] a. 0.5g dithiophene, 0.5g SiO 2 Airgel and 0.25g Co(NO 3 ) 2 ·6H 2 O is dispersed in tetrahydrofuran and stirred evenly, and the solvent is removed by rotary evaporation to obtain a uniform mixture; the obtained uniform mixture is transferred to a quartz crucible or a corundum crucible, put into a tube furnace, and then nitrogen is introduced as a protective gas, and the tube furnace Raise the temperature to 800°C at a rate of 5°C / min, and keep it for 2h; then cool down to room temperature naturally, and maintain normal pressure in the tube furnace; then transfer the obtained product to a flask, add about 2mol / L NaOH solution 40mL, and stir for 36h Alkali etching for the first time; then centrifuge the solution in a centrifuge at 8000r for 5min; then pour off the centrifuged supernatant, transfer the lower solid to the flask again, and add about 2mol / L NaOH solution About 40mL, stirred for 36h, and carried out the second alkali etching; finally, centrifuged and washe...

Embodiment 2

[0064] a. 0.5g dithiophene, 0.5g SiO 2 Airgel and 0.25g Co(NO 3 ) 2 ·6H 2O is dispersed in tetrahydrofuran and stirred evenly, and the solvent is removed by rotary evaporation to obtain a uniform mixture; the obtained uniform mixture is transferred to a quartz crucible or a corundum crucible, put into a tube furnace, and then nitrogen is introduced as a protective gas, and the tube furnace Raise the temperature to 800°C at a rate of 5°C / min, keep it for 2h, then cool down to room temperature naturally, and keep the normal pressure in the tube furnace; then transfer the obtained product to a flask, add about 40mL of 2mol / L NaOH solution, and stir for 36h , carry out the first alkaline etching; then centrifuge the solution in a centrifuge at 8000r for 5min, pour off the centrifuged supernatant, transfer the lower solid to the flask again, and add about 2mol / L About 40mL of NaOH solution, stirred for 36h, and carried out the second alkali etching; finally, centrifuged and wash...

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Abstract

The invention provides an ultra-small multi-component alloy composite material, which includes sulfur-doped mesoporous carbon and ultra-small alloy particles loaded on the surface of the sulfur-doped mesoporous carbon; the average size of the ultra-small alloy particles is 2nm. This application also provides a method for preparing ultra-small multi-component alloy composite materials. This application also provides the application of ultra-small multi-component alloy composite materials in heterogeneous catalysis. This application synthesizes an ultra-small multi-component alloy composite material by regulating the type and temperature of the metal salt precursor. The average size of the alloy particles in the composite material is 2nm, which is small in size and has high utilization rate; and the method is universal. , simple operation, low cost, and easy for industrial production.

Description

technical field [0001] The invention relates to the technical field of nanometer materials, in particular to an ultra-small multi-element alloy composite material, a preparation method and application thereof. Background technique [0002] In recent years, alloys are an important class of industrial heterogeneous catalysts, which have greatly improved their catalytic stability, activity, and selectivity compared with single metal components. Parameters such as particle size, composition, surface structure, and interfacial interaction with supports of metal nanoparticles have a high impact on the catalytic performance of supported metal catalysts. As the particle size decreases, the alloy exhibits some unique properties. [0003] So far, various methods have been proposed to form ultra-small bimetallic clusters, such as dendrimer template method, polymer protection and liquid phase reduction method, direct thermal treatment of molecular metal-organic precursor method, Co-SEA...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J27/20B01J35/00B01J37/00B01J37/08C07C45/38C07C47/54C07C51/367C07C59/01C07C209/36C07C211/52
CPCB01J27/20B01J37/0018B01J37/08B01J37/082C07C209/365C07C51/367C07C45/38B01J35/393B01J35/396C07C211/52C07C59/01C07C47/54
Inventor 梁海伟许实龙
Owner 安徽枡水新能源科技有限公司
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