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Nitrogen-doped hierarchical pore carbon and preparation method and application thereof

A nitrogen-doped, multi-level hole technology, applied in the preparation of carbon-based compounds, chemical instruments and methods, preparation of hydroxyl compounds, etc., can solve the problems of large corrosion of reaction equipment, high production cost, high energy consumption, etc. Surface area, reduced runoff, avoidance of agglomeration

Active Publication Date: 2016-12-07
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, most of the industry uses water vapor activation, KOH and ZnCl 2 Other activators, the temperature required for water vapor activation is relatively high (≥1000°C), and the energy consumption is relatively large, while KOH and ZnCl 2 The corrosion of the reaction equipment is relatively large, so the production cost is relatively high

Method used

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  • Nitrogen-doped hierarchical pore carbon and preparation method and application thereof
  • Nitrogen-doped hierarchical pore carbon and preparation method and application thereof
  • Nitrogen-doped hierarchical pore carbon and preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0048] Embodiment 1: Taking biomass derivative cellulose as raw material

[0049] Weigh 4g of cellulose, 12g of sodium bicarbonate and 12g of ammonium oxalate, transfer them to a 30ml crucible after mechanical mixing, and then calcine them in a nitrogen furnace. The steps of calcining are: heating up to 800°C at 10°C / min, calcining at 800°C for 1 hour; then cooling down to room temperature naturally. The calcined product was ground and mixed with deionized water, filtered after standing for 24 hours, and the precipitate was washed until neutral, and then dried to obtain the nitrogen-doped hierarchical porous carbon material (NHPC).

[0050] The SEM and TEM images of the nitrogen-doped hierarchically porous carbon material prepared in this example are as follows figure 1 , 2 Shown:

[0051] observe figure 1 It can be seen that the surface of the activated carbon material contains abundant pore structures, among which macropores can be clearly seen.

[0052] image 3 Provi...

Embodiment 2

[0124] Embodiment 2: take original biomass peanut shell as raw material

[0125] Weigh 4g of cellulose, 12g of sodium bicarbonate and 12g of ammonium oxalate, transfer them to a 30ml crucible after mechanical mixing, and then calcine them in a nitrogen furnace. The steps of calcining are: heating up to 800°C at 10°C / min, calcining at 800°C for 1 hour; then cooling down to room temperature naturally. The calcined product was ground, mixed with deionized water, filtered after standing for 24 hours, the precipitate was washed until neutral, and dried to obtain the nitrogen-doped hierarchical porous carbon material. The scanning electron microscope image of the nitrogen-doped hierarchical porous carbon material prepared in this example is as follows Figure 11 shown.

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Abstract

The invention discloses a preparation method of nitrogen-doped hierarchical pore carbon. The preparation method includes: using biomass as a raw material, and mixing the biomass with a composite activator; heating for calcining, mixing a calcining product with deionized water, standing for precipitation, and filtering to obtain precipitate; performing after-treatment to obtain the nitrogen-doped hierarchical pore carbon, wherein the composite activator is sodium hydrogen carbonate / nitrogen-containing compound, a mass ratio of sodium hydrogen carbonate to the nitrogen-containing compound is 0.25-4:1, the nitrogen-containing compound comprises at least one of ammonium oxalate, ammonium hydrogen carbonate, ammonium chloride and ammonium nitrate, and a mass ratio of the biomass to the composite activator is 1:2-16. The composite activator is utilized to activate the biomass to obtain a functionalized nitrogen-doped hierarchical pore carbon material, the preparation method is simple and easy to operate, the biomass existing in nature can be utilized directly, the obtained carbon material has rich hierarchical pore structure and can be used as a catalyst carrier to prepare high-performance nano catalysts, and utilization value of the biomass is increased greatly.

Description

technical field [0001] The invention belongs to the technical field of porous carbon materials, and in particular relates to a nitrogen-doped hierarchical porous carbon and its preparation method and application. Background technique [0002] Activated carbon is mainly used as a carrier of metal nanoparticles for the synthesis of chemicals in industrial production because of its large specific surface area and developed pores. However, traditional activated carbon materials are mainly micropores, which greatly limit the mass transfer during the reaction and affect the reaction efficiency; their microporous structure will also lead to a decrease in the utilization efficiency of the loaded nanoparticles, because most metal particles larger than 2nm It is mainly exposed to the outside of the carrier, and agglomeration and loss will occur under severe reaction conditions; in addition, the non-functional structure leads to weak binding force between it and the supported nano-meta...

Claims

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Application Information

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IPC IPC(8): B01J27/24C07B35/02C07C45/00C07C49/403C07C29/141C07C33/32C07C5/10C07C13/18C07C51/36C07C61/08C07C41/26C07C43/23
CPCC07B35/02C07C5/10C07C29/141C07C41/26C07C45/006C07C51/36B01J27/24B01J37/082B01J37/084C07C2527/24B01J35/617B01J35/633B01J35/615C07C49/403C07C33/32C07C13/18C07C61/08C07C43/23
Inventor 王勇李名明邓江汤明慧
Owner ZHEJIANG UNIV
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