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A kind of activated carbon and its preparation method and application

An activated carbon and activated carbon-based technology, which is applied in chemical instruments and methods, carbon compounds, inorganic chemistry, etc., can solve the problems that the hydrogen storage capacity cannot reach the mass fraction, it is difficult to achieve reversible hydrogen storage, etc., and achieve high hydrogen storage performance, The effect of accelerating hydrogen adsorption rate and increasing micropore volume

Active Publication Date: 2022-02-15
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the current utilization of hydrogen energy needs to solve three problems: hydrogen energy production, storage, transportation and application, while the storage and transportation of hydrogen energy is the bottleneck of hydrogen energy utilization. It is difficult for the currently developed materials to reach 5.5wt% at room temperature. The goal of gravimetrically reversible hydrogen storage
[0005] However, when ordinary activated carbon is used to absorb hydrogen, even at low temperature, the hydrogen storage capacity cannot reach the mass fraction of 1wt%.

Method used

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Examples

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Effect test

preparation example Construction

[0022] As discussed in the background technology, the amount of hydrogen absorbed by activated carbon is related to parameters such as the specific surface area, pore size distribution and pore structure of the carbon material. The preparation method and application, the prepared activated carbon has the characteristics of ultra-high specific surface area, high microporosity, etc., exhibits high hydrogen storage performance under normal temperature and medium pressure, and the preparation method is simple and practical, and the cost is low.

[0023] In one embodiment of the present invention, a kind of preparation method of activated carbon is provided, comprising the following steps:

[0024] (1) Soak the biomass debris with LiOH solution, dry and grind after ultrasonic treatment;

[0025] (2) subjecting the dried biomass debris to high-pressure expansion treatment to obtain a biomass-based activated carbon precursor;

[0026] (3) The ground anhydrous ZnCl 2 Mix evenly with...

Embodiment 1

[0043] (1) Soak biomass debris such as straw, rice husk, cotton, beans, etc. in LiOH solution, ultrasonically treat for 10 hours, dry and grind, and dry until the moisture inside the debris accounts for 10% of the total mass;

[0044] (2) Put the dried biomass debris into the high-pressure extruder, inject a small amount of deionized water and then vacuumize, heat and control the temperature at 300°C and the pressure at 1.5MPa for 8 minutes; then quickly release the pressure within 1s , so that the biomass debris completes the instantaneous expansion and flash explosion wall breaking process, and then realizes the fracture and wall breaking of lignin, cellulose and other components in the biomass, and obtains a biomass-based activated carbon precursor;

[0045] (3) Ground anhydrous ZnCl with a mass ratio of 3:1 2 Mix evenly with the biomass-based activated carbon precursor, reverse and shake for 4 hours in a vacuum environment, and make the ZnCl 2 fully penetrate into the pre...

Embodiment 2

[0048] (1) Soak biomass debris such as straw, rice husk, cotton, beans, etc. in LiOH solution, ultrasonically treat for 10 hours, dry and grind, and dry until the moisture inside the debris accounts for 10% of the total mass;

[0049] (2) Put the dried biomass into a high-pressure extruder, inject a small amount of deionized water, and then vacuumize, heat and control the temperature at 300 ° C, and the pressure at 1.5 MPa for 8 minutes; then quickly release the pressure within 1 second, so that Biomass debris completes the instantaneous expansion flash explosion wall breaking process, and then realizes the fracture and wall breaking of lignin, cellulose and other components in the biomass, and obtains a biomass-based activated carbon precursor;

[0050] (3) Grinding anhydrous ZnCl with a mass ratio of 4:1 2 Mix evenly with the precursor, reverse and oscillate for 4 hours in a vacuum environment, and make the ZnCl 2 fully penetrate into the precursor;

[0051] (4) N at a flo...

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Abstract

The invention relates to the technical field of hydrogen storage materials, in particular to an activated carbon and its preparation method and application. It is obtained by soaking the debris of biomass raw material in LiOH solution, drying and grinding after ultrasonic treatment, putting it into a special puffing kettle, and heating it up. precursor; then the precursor and anhydrous ZnCl 2 Mixed, put into tube furnace for three-stage heating and calcining, and pass N 2 gas, and finally a modified super activated carbon hydrogen storage material is obtained. The activated carbon material is analyzed and tested, and the specific surface area is ≥3000m 2 / g, the micropore volume reaches 2cm 3 About / g, the micropore volume ratio reaches more than 80%, and the average pore diameter is between 0.5 and 1.2nm. Under the operating conditions of room temperature and 40bar, the hydrogen storage capacity can reach more than 2.5wt%, and the adsorption rate is very fast. This method utilizes the principle of biomass flash explosion wall breaking to modify high-performance hydrogen storage materials, which has low cost and simple manufacturing process, and can achieve high hydrogen storage performance at room temperature, medium and high pressure. An effective way is provided.

Description

technical field [0001] The invention relates to the technical field of hydrogen storage materials, in particular to an activated carbon and its preparation method and application. The activated carbon with high specific surface area and high microporosity is obtained by using biomass raw materials, a specific pretreatment method and an activation process. It exhibits high hydrogen storage performance under pressure. Background technique [0002] The information disclosed in this background section is only intended to increase the understanding of the general background of the present invention, and is not necessarily taken as an acknowledgment or any form of suggestion that the information constitutes the prior art already known to those skilled in the art. [0003] Hydrogen has been recognized as an attractive energy carrier as an alternative to fossil fuels. Hydrogen has the highest energy density of 120kJ / g, about three times that of gasoline, and it does not produce any...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B32/324C01B32/348C01B3/00
CPCC01B32/324C01B32/348C01B3/0021Y02E60/32
Inventor 程星星程圣明常景彩王鹏王志强马春元
Owner SHANDONG UNIV
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