Preparation method of porous carbon

A technology of porous carbon and organic matter, applied in the field of preparation of porous carbon, can solve the problems of difficult recovery of template agent and pore-forming agent, high cost of chemical corrosion resistance, complicated preparation process, etc., achieves good electrochemical performance, reduces energy consumption, The effect of simplifying the preparation process

Inactive Publication Date: 2015-04-08
NANJING UNIV OF TECH
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Problems solved by technology

In the existing preparation methods of porous carbon, the commonly used methods are high temperature (800-1000 ℃) activation, hard template method for pore formation, pore formation agent pore formation and chemical corrosion (potassium hydroxide, phosphoric acid), etc., these The method has disadvantages such as high energy consumption, difficult recovery of template and pore-forming agents, complex preparation process, high cost of chemical corrosion resistance of equipment, etc.

Method used

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Embodiment 1

[0033] Embodiment 1: the preparation of porous carbon

[0034] Weigh 5g of chitosan (purchased from Sinopharm Chemical Reagent Co., Ltd.), fully mix it with 50g of zinc chloride (purchased from Shanghai Xinbao Fine Chemical Factory), place it in a tube furnace, and heat it at 600°C under a nitrogen atmosphere. Calcined for 2h to obtain porous carbon-ZnCl 2 Complex. Then the obtained porous carbon-ZnCl 2 Complex with 1mol L -1 hydrochloric acid treatment at 60 ° C for 2 hours to obtain wet porous carbon, ZnCl obtained after treatment 2 The hydrochloric acid solution can be concentrated and dried to obtain ZnCl 2 Solids are recycled. Finally, the wet porous carbon was dried under vacuum at 100°C for 2 h to obtain porous, figure 1 , 2 shows its microscopic morphology is loose porous structure. The adsorption-desorption curve of porous carbon was obtained by using the method of nitrogen adsorption-desorption test. image 3 As shown, the analysis shows that its specific sur...

Embodiment 2

[0036] Embodiment 2: the preparation of porous carbon

[0037] Weigh 5 g of glucose (purchased from Sinopharm Chemical Reagent Co., Ltd.), fully mix it with 35 g of zinc chloride (purchased from Shanghai Xinbao Fine Chemical Factory), place it in a tube furnace, and calcinate at 700 °C for 10 h under nitrogen atmosphere , to obtain porous carbon-ZnCl 2 Complex. Then the obtained porous carbon-ZnCl 2 Complex with 6mol L -1 Hydrochloric acid was treated at 25°C for 10h to obtain wet porous carbon, and finally, the wet porous carbon was dried at 80°C in nitrogen for 10h to obtain porous carbon. Figure 8 The microscopic morphology is shown as a loose porous structure. The adsorption-desorption curve of porous carbon was obtained by using the method of nitrogen adsorption-desorption test, such as Figure 9 As shown, its specific surface area is 2120m 2 g -1 . The porous carbon contains hierarchical pores with a pore size ranging from 3.2 to 50 nm, such as Figure 10 shown...

Embodiment 3

[0038] Embodiment 3: the preparation of porous carbon

[0039] Weigh 5g of polyacrylonitrile (purchased from Sigma-Aldrich), fully mix it with 25g of zinc chloride (purchased from Shanghai Xinbao Fine Chemical Factory), place in a tube furnace, and calcinate at 400°C for 2h under nitrogen atmosphere , to obtain porous carbon-ZnCl 2 Complex. Then the obtained porous carbon-ZnCl 2 Complex with 0.5mol L-1 The hydrochloric acid was treated at 10° C. for 5 h to obtain wet porous carbon, and finally, the wet porous carbon was dried in argon at 200° C. for 0.5 h to obtain porous carbon. Figure 11 The microscopic morphology is also shown as a loose porous structure. Figure 12 Using the method of nitrogen adsorption and desorption test, the adsorption and desorption curve of porous carbon is obtained, and its specific surface is 670m 2 g -1 . The pore size distribution is mainly multi-level pore size of 0.5-3.72nm, such as Figure 13 shown. When this material is applied to a ...

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Abstract

The invention relates to a preparation method of porous carbon. The preparation method of porous carbon comprises the following steps: well mixing carbonaceous organic material serving as raw material with solid ZnCl2 powder in dry air; then, carrying out fluidized calcination reaction in an inert atmosphere to obtain a porous carbon-ZnCl2 composition; treating the obtained porous carbon-ZnCl2 composition in a hydrochloric acid solution and washing ZnCl2 out of porous carbon; and finally drying to obtain the finished porous carbon product. When the prepared porous carbon is used as an electrode material of an electrochemical capacitor, due to large specific area and a hierarchical pore structure rich in microspores and mesopores, the prepared porous carbon shows excellent electrochemical performance. According to the preparation method, at 400-700 DEG C, Zn<2+> and Cl<-> in fused salt are used for inducing the carbonization and activation pore forming process of an organic matter precursor; the advantages that an activating agent can be recycled, the energy consumption is low, production efficiency is high are achieved; therefore, the preparation method is very suitable for large-scale production.

Description

technical field [0001] The invention relates to the fields of nanometer materials and electrochemical capacitors, in particular to a preparation method of porous carbon. Background technique [0002] Porous carbon is a widely used carbon material at present, and has attracted the attention of academia and business circles in the fields of adsorbents, catalyst supports, electrochemical materials, and hydrogen storage materials. High specific surface (>1000m 2 g -1 ) and rich micropores (diameter less than 2nm), mesoporous (diameter 2nm-50nm) channel structure are important evaluation indicators for high-quality porous carbon products, and occupy a core position in the production technology of porous carbon. In the existing preparation methods of porous carbon, the commonly used methods are high temperature (800-1000 ℃) activation, hard template method for pore formation, pore formation agent pore formation and chemical corrosion (potassium hydroxide, phosphoric acid), et...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/02
Inventor 邵宗平邓翔赵伯特蔡锐冉然
Owner NANJING UNIV OF TECH
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