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Method for preparing high-nitrogen-content porous carbon material by utilizing biomass, product and application thereof

A high nitrogen-containing, porous carbon technology, applied in chemical instruments and methods, carbon compounds, inorganic chemistry, etc., can solve the problems of difficulty in wide application, high price of nitrogen-doped carbon, difficulty in obtaining nitrogen-doped carbon materials, etc., and achieve low cost. , easy-to-control, simple-to-operate effects

Inactive Publication Date: 2018-06-15
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the current preparation process of nitrogen-doped carbon materials often requires multi-step complex operations such as activation, doping and modification, which makes nitrogen-doped carbon expensive and difficult to be widely used, and the nitrogen content in nitrogen-doped carbon is difficult to be accurate control, it is difficult to obtain nitrogen-doped carbon materials with higher nitrogen content

Method used

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  • Method for preparing high-nitrogen-content porous carbon material by utilizing biomass, product and application thereof
  • Method for preparing high-nitrogen-content porous carbon material by utilizing biomass, product and application thereof
  • Method for preparing high-nitrogen-content porous carbon material by utilizing biomass, product and application thereof

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Embodiment 1

[0039] The embodiment of the present invention describes a method of using biomass to prepare porous carbon materials with high nitrogen content, and the method specifically includes the following steps:

[0040] S1: crush and sieve the bamboo chips to a size less than 120 mesh, put them in an oven at 105°C for 24 hours, and obtain pyrolysis raw materials;

[0041] S2: Fully mix the bamboo chips in step S1 with the KOH activator at a mass ratio of 2:1, use a fixed-bed reactor with a diameter of 45 mm and a length of 60 mm for pyrolysis, and heat the reactor to a nitrogen-enriched pyrolysis temperature of 600 After ℃, 2g of biomass mixture is quickly sent to the middle of the reactor, and the reaction time is 30min to fully decompose the biomass. The total flow rate of argon and ammonia is 200mL / min, and the proportion of ammonia is 10%;

[0042] S3: Pickling the pyrolytic carbon obtained in step S2, the concentration of hydrochloric acid solution is 1mol / L, then filtering and ...

Embodiment 2

[0045] This embodiment is the same as Embodiment 1, except that the activator is NaOH.

[0046] The obtained porous carbon material with high nitrogen content has a well-developed pore structure with a surface area of ​​1080 m 2 / g, and has abundant active nitrogen-containing functional groups (pyridine-N, pyrrole-N, quaternary-N and pyridine-N-oxide), and the nitrogen content reaches 7wt.%.

Embodiment 3

[0048] This embodiment is the same as embodiment 1, but the activator is K 2 CO 3 .

[0049] The obtained porous carbon material with high nitrogen content has a well-developed pore structure with a surface area of ​​1150m 2 / g, and has abundant active nitrogen-containing functional groups (pyridine-N, pyrrole-N, quaternary-N and pyridine-N-oxide), and the nitrogen content reaches 12wt.%.

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Abstract

The invention discloses a method for preparing a high-nitrogen-content porous carbon material by utilizing biomass, a product and application thereof. The preparation process is as follows: pulverizing and drying the biomass, mixing the biomass and an activating agent uniformly, performing rapid pyrolysis on the mixture under the atmosphere of ammonia gas, and carrying out reaction between the activating agent and the biomass waste to etch a carbon skeleton to form a developed pore structure; meanwhile, a large amount of holes are formed, nitrogen atoms in the ammonia gas occupy the holes rapidly to form rich active nitrogen-containing functional groups (pyridine-N, pyrrole-N, quaternary-N and pyridine-N-oxide), so that a large amount of nitrogen elements are enriched in pyrolytic carbon;furthermore, the own action of the ammonia gas and the synergistic effect of the activating agent and the ammonia gas can promote formation of coke pores and nitrogen-containing functional groups, anda functional high-nitrogen-content porous carbon material with rich activated nitrogen-containing functional groups is finally formed and has wide application prospect in the fields of catalysts, adsorbents, electrode materials and the like, so that high-additional-value utilization of the biomass is realized.

Description

technical field [0001] The invention relates to the field of biomass utilization, in particular to a method for preparing a high-nitrogen porous carbon material by utilizing biomass and a product thereof. Background technique [0002] Biomass is an important renewable energy source, which not only has the potential to replace depleted fossil fuels, but also can be used to prepare a large number of chemicals. Biochar materials can be obtained through simple pyrolysis of biomass, which can be used for soil improvement, including carbon sequestration, soil fertility improvement, pollution control, etc. However, because biochar has a small specific surface area and insufficiently developed active functional groups, it is difficult to use it with high added value. However, through activation and modification of biochar, functional carbon materials with well-developed pore characteristics and rich active functional groups can be obtained, which can be applied to electrode materia...

Claims

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Application Information

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IPC IPC(8): C01B32/324C01B32/348C01B32/342
CPCC01P2002/52C01P2002/85C01P2006/12
Inventor 陈汉平陈伟陈应泉杨海平王贤华邵敬爱张雄杨晴张世红
Owner HUAZHONG UNIV OF SCI & TECH
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