Charcoal-based hard foamy carbon, preparation method thereof, and application of charcoal-based hard foamy carbon in electro-catalysis

A technology of rigid foam and biochar, applied in carbon preparation/purification, electrodes, electrolytic components, etc., can solve the problems of high cost of noble metal catalysts, low cycle life, high catalytic cost, etc., and achieve excellent electrocatalytic oxidation performance , high current density and good cycle stability

Active Publication Date: 2021-07-13
UNIV OF SCI & TECH OF CHINA
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Problems solved by technology

There are certain limitations in the above existing methods, mainly in the high cost of noble metal catalysts or the conditions of high temperature and high pressure required for the reaction; and the traditional porous carbon electrode materials such as carbon paper and carbon felt have low mechanical strength and low cycle life, while traditional graphite , Glassy carbon electrode material has small specific surface area and high manufacturing cost
Therefore, it is necessary to develop a new catalytic oxidation technology to overcome the problems of high catalytic cost in the catalytic oxidation of 5-hydroxymethylfurfural

Method used

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  • Charcoal-based hard foamy carbon, preparation method thereof, and application of charcoal-based hard foamy carbon in electro-catalysis
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  • Charcoal-based hard foamy carbon, preparation method thereof, and application of charcoal-based hard foamy carbon in electro-catalysis

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preparation example Construction

[0034] The invention provides a kind of preparation method of biochar-based rigid foam carbon, comprising the following steps:

[0035] S1. Provide chitosan airgel;

[0036] S2. Composite the chitosan airgel with a phenolic resin, and then perform pyrolysis in an inert gas atmosphere to obtain a biochar-based rigid foam carbon containing glassy carbon.

[0037] The rigid foam carbon prepared by the invention has a large specific surface area, high mechanical strength, good cycle life and practicability, can prepare electrode materials, and meets the requirements of low cost, easy preparation and high efficiency.

[0038] In the embodiment of the present invention, chitosan airgel is first prepared, and the raw material used is chitosan, which is prepared through sol-gel and freeze-drying to obtain a porous light solid material. Chitosan (chitosan) is the product of N-deacetylation of chitin, and its source is the shells of marine arthropods such as shrimps and crabs, the shel...

Embodiment 1

[0076] Synthesis of chitosan-resol phenolic resin pyrolytic foam carbon substrate:

[0077] Disperse 3.3g chitosan powder in 50mL water, add a small amount of acetic acid dropwise while stirring to dissolve chitosan. The obtained chitosan gel was freeze-dried in a vacuum freeze dryer at -80° C. for 96 hours, and the obtained lightweight chitosan airgel was cut into blocks of 2 cm×2 cm×1 cm. Take 2.2g resorol, 3g formaldehyde solution and 5mg sodium carbonate, dissolve in 2mL water and mix ultrasonically for 10min, and add dropwise on the chitosan airgel block, so that it is completely saturated by the solution. The soaked chitosan block was placed in a sealed environment and heated at 70°C for 36h, and then transferred to a ventilated environment to continue drying and heating at 70°C for 12h. Afterwards, it was raised to 950°C under nitrogen atmosphere at 2.5°C / min under temperature control, and maintained for 6h; the pyrolyzed chitosan carbon block was ultrasonicated in dei...

Embodiment 2

[0088] Loading of hydrotalcite-based catalytically active components:

[0089] Take 60mg FeCl 2 ·5H 2 O, 262mg Ni(NO 3 ) 2 ·6H 2 O was dissolved in 30 mL of deionized water, and 90 mg of triethanolamine and 0.36 g of urea were added at the same time, and stirred evenly. Place the biochar-based rigid foam carbon substrate prepared in the preceding Example 1 in the 50mL stainless steel hydrothermal reactor In the inner lining, then slowly move the above mixed solution into the kettle, and place it in a blast oven at 120°C for hydrothermal treatment for 12 hours. After the hydrothermal heat was over, the reactor was taken out, placed in the air and slowly cooled to room temperature. After cooling, the biochar-based rigid foam carbon electrode in the reactor was taken out, and the precipitate attached to the surface was washed with deionized water three times, each time for 10 s. After rinsing, it was dried in the shade to obtain the prepared biochar-based rigid foam carbo...

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Abstract

The invention provides a charcoal-based hard foamy carbon, a preparation method thereof, and application of the charcoal-based hard foamy carbon in electro-catalysis. The preparation method of the foamy carbon comprises the following steps: S1, providing chitosan aerogel; and S2, compounding the chitosan aerogel with phenolic resin, and then performing pyrolysis in an inert gas atmosphere to obtain the charcoal-based hard foamy carbon containing glassy carbon. The hard foamy carbon prepared by the method has a large specific surface area, relatively high mechanical strength and low synthesis cost, and can be used as an electrode material to realize high-efficiency selective catalytic oxidation of 5-hydroxymethylfurfural. The preferable layered double-metal hydroxide catalyst shows excellent electrocatalytic oxidation performance on 5-hydroxymethylfurfural, and oxidation of a target product can be rapidly completed with high selectivity. The reaction condition of electrocatalytic oxidation of 5-hydroxymethylfurfural by the catalyst synthesized in the embodiment of the invention is mild, and selective oxidation of 5-hydroxymethylfurfural can be completed within a short time under the mild conditions of normal temperature and normal pressure.

Description

technical field [0001] The invention belongs to the technical field of chemical materials and energy and environmental protection, and specifically relates to a biochar-based rigid foam carbon, its preparation method and its application in electrocatalysis, such as supporting the formation of a layered double metal hydroxide catalyst, and electrocatalyzing A method for preparing 2,5-furandicarboxylic acid by catalytically oxidizing 5-hydroxyfurfural. Background technique [0002] With the over-exploitation of traditional fossil energy, the reserve of fossil energy is continuously shrinking, and the energy crisis and environmental problems are becoming more and more serious in today's world. Therefore, it is imminent for human beings to study the strategies of sustainable and renewable new energy sources to replace traditional non-renewable energy sources. As a renewable non-fossil fuel carbon source, biomass is a very valuable alternative to fossil energy, and it has gradua...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/05C25B11/054C25B11/065C25B11/075C25B3/05C25B3/07C25B3/23C25B11/031
CPCC01B32/05
Inventor 俞汉青季翔宇刘武军
Owner UNIV OF SCI & TECH OF CHINA
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