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Nitrogen-rich biomass-based activated carbon with hierarchical pore microchannel structure and application thereof

A technology based on microchannel structure and activated carbon, which is applied in the field of porous carbon materials, can solve the problems of low nitrogen doping, microchannel structure damage, and low sulfur storage capacity, and achieve high nitrogen doping and excellent desulfurization performance.

Active Publication Date: 2021-11-05
SICHUAN UNIV
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  • Claims
  • Application Information

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Problems solved by technology

[0007] Aiming at the problems of low nitrogen doping amount and low sulfur storage capacity due to the destruction of the microchannel structure in the nitrogen-doped activated carbon prepared by using biomass as raw material, the present invention provides a one-step preparation with simple operation and low cost. Method for nitrogen-enriched biomass-based activated carbon with porous microchannel structure, transforming biomass into biomass-based activated carbon with hierarchical porous microchannel structure and high nitrogen content

Method used

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  • Nitrogen-rich biomass-based activated carbon with hierarchical pore microchannel structure and application thereof
  • Nitrogen-rich biomass-based activated carbon with hierarchical pore microchannel structure and application thereof
  • Nitrogen-rich biomass-based activated carbon with hierarchical pore microchannel structure and application thereof

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preparation example Construction

[0033] Specifically, nitrogen-rich biomass-based activated carbon with hierarchical porous microchannel structure is prepared by the following method:

[0034] A. Place biomass, nitrogen source and activator in water, mix well, then dry, grind and sieve to obtain a solid mixture; the nitrogen source is melamine cyanurate or melamine-containing cyanurate nitrogen source mixture;

[0035]B. The solid mixture obtained in step A is heated to 650-950° C. for calcination under an inert atmosphere, and the calcined product is washed and dried to form a nitrogen-rich biomass-based activated carbon with a multi-level porous microchannel structure.

[0036] The present invention first studies the pyrolysis characteristics of biomass, common nitrogen sources (urea and melamine, etc.) and melamine cyanurate (MCA), and finds that the main thermal decomposition temperature (380°C to 450°C) of MCA is higher than that of common Nitrogen source urea (150-240°C) and melamine (300-380°C) are hi...

Embodiment 1

[0052] Take 65.4g of wood chips with a particle size of 40 mesh and 32.7g of potassium hydroxide in 250mL of deionized water and stir for 0.5 hours, then dry the formed uniform cloudy liquid at 105°C for 24 hours to obtain a solid mixture; grind the dried solid mixture After a 40-mesh sieve, heat it to 800°C at a heating rate of 10°C / min in a tube furnace and keep it for 2 hours. The calcination atmosphere is a nitrogen atmosphere, and the nitrogen flow rate is 980mL / min; After drying, pass through a 200-mesh sieve to obtain the product YC-0.5-0(8).

Embodiment 2

[0054] Take 49g of wood chips with a particle size of 40 mesh and 49g of melamine cyanurate in 250mL of deionized water and stir for 0.5 hours, then dry the formed uniform cloudy liquid at 105°C for 24h to obtain a solid mixture; grind the dried solid mixture After passing through a 40-mesh sieve, heat it to 800°C at a heating rate of 10°C / min in a tube furnace and keep it for 2 hours. The calcination atmosphere is a nitrogen atmosphere, and the nitrogen flow rate is 980mL / min; the calcined product is washed with deionized water to Dry after neutralization, and pass through a 200-mesh sieve to obtain the product YC-0-1(8).

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Abstract

The invention discloses nitrogen-rich biomass-based activated carbon with a hierarchical pore microchannel structure and application thereof, and belongs to the technical field of porous carbon materials. In order to solve the problems of low nitrogen doping amount, microchannel structure damage and the like in the existing nitrogen-doped activated carbon, the invention provides nitrogen-rich biomass-based activated carbon with the hierarchical pore microchannel structure, and the preparation method of the nitrogen-rich biomass-based activated carbon with the hierarchical pore microchannel structure comprises the following steps: uniformly mixing biomass, melamine cyanurate or a mixed nitrogen source thereof and an activating agent in water, drying, grinding and sieving, and heating to 650-950 DEG C in an inert atmosphere, calcining, washing and drying to obtain the product. The nitrogen-rich biomass-based activated carbon with the hierarchical pore microchannel structure has the characteristics of high specific surface area, high total pore volume, hierarchical pore structure, high nitrogen content, high surface nitrogen content, low activator dosage, low micropore rate and the like, and has excellent desulfurization and decarbonization performance.

Description

technical field [0001] The invention belongs to the technical field of porous carbon materials, and in particular relates to a nitrogen-rich biomass-based activated carbon with a multi-level porous microchannel structure and an application thereof. Background technique [0002] H is widely present in industrial production sites such as oil refineries, landfills, and biogas / natural gas purification plants. 2 S has caused great harm to human life safety, property safety and ecological environment due to its characteristics of acidity, strong corrosion and irritation. Currently, separation and removal of H 2 The technologies of S mainly include biological filtration method, chemical absorption method, activated carbon method and metal oxide method. Among them, the activated carbon method is widely used in low-temperature desulfurization because of its advantages of high-efficiency removal, low energy consumption, less secondary pollution and easy regeneration. [0003] in th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/324C01B32/348B01J20/30B01J20/20B01D53/04H01G11/32
CPCC01B32/324C01B32/348H01G11/32B01J20/0259B01J20/20B01D53/04B01D2257/304B01D2257/302B01D2257/504Y02C20/40Y02A50/20
Inventor 江霞吴见平陈文华陈琳靳紫恒
Owner SICHUAN UNIV
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