Activated carbon as well as preparation method and application thereof

An activated carbon and activated carbon adsorption technology, applied in chemical instruments and methods, other chemical processes, alkali metal oxides/hydroxides, etc., can solve problems such as very high requirements for equipment materials, high cost of LNG technology, and complex storage tank design. , to achieve the effect of resource utilization, high methane adsorption capacity and suitable specific surface area

Active Publication Date: 2021-07-16
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Compared with several other technologies, CNG technology is relatively mature and has been commercially applied in natural gas vehicles. The volume energy density is 9.2 MJ / L, which is about 29% of gasoline, but the storage pressure of CNG is as high as 20 MPa, and the requirements for equipment materials Very high, also resulting in higher cost
LNG technology is to store natural gas in liquid form under 112K and 0.1MPa pressure, and the energy density can reach 22.2MJ / L, which is about 72% of gasoline. However, LNG technology is costly, the storage tank design is complicated, and there are safety risks such as leakage.
NGH technology is to store natural gas and water in the form of clathrate hydrate, which is not yet mature

Method used

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  • Activated carbon as well as preparation method and application thereof
  • Activated carbon as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Grind the petroleum coke, potassium hydroxide, and nickel nitrate to a particle size of 20-300 mesh and mix evenly according to the mass ratio of 1:3:0.05. Activate in a nitrogen atmosphere at 900°C for 60 minutes, and cool down to 600°C in a nitrogen atmosphere. Stop feeding nitrogen, change to feeding methane / nitrogen mixed gas (volume ratio of methane and nitrogen: 2:10), keep warm at 600°C for 60 minutes, after cooling to room temperature, the activated product is filtered and washed with water until the pH of the filtrate is neutral, and then in the filter cake Add 10wt% dilute hydrochloric acid, wash at 60°C for 180min, filter and separate the product and continue to wash with water until the pH of the filtrate is neutral, and dry the solid product at 120°C for 5h to obtain activated carbon AC-1. The accessibility A of AC-1 is 2.0, and the specific surface area is 1937m 2 / g, 3.5MPa, 25 °C methane adsorption capacity is 236ml / (g, STP).

Embodiment 2

[0033] Grind the petroleum coke, potassium hydroxide, and cobalt nitrate to a particle size of 20-300 mesh and mix evenly according to the mass ratio of 1:4:0.1, and pass through the acetylene / nitrogen gas mixture (the volume ratio of acetylene and nitrogen is 1:5), Keep warm at 700°C for 30 minutes, stop feeding acetylene / nitrogen mixed gas, change to nitrogen, continue to heat up to 850°C, and keep warm for 30 minutes. After cooling to room temperature, the activated product was filtered and washed with water until the pH value of the filtrate was neutral, then 20 wt% of dilute sulfuric acid was added to the filter cake, and washed at 50°C for 240 minutes, and the product was further washed with water after separation by filtration until the pH value of the filtrate was neutral, and the solid product Activated carbon AC-2 was obtained by drying at 100°C for 12 h. The accessibility A of AC-2 is 1.9, and the specific surface area is 1843m 2 / g, 3.5MPa, 25°C methane adsorption...

Embodiment 3

[0035] Grind petroleum coke, potassium hydroxide, and ferric oxide to a particle size of 20-300 mesh and mix evenly in a mass ratio of 1:7:0.2, activate at 950°C for 60 minutes in a nitrogen atmosphere, and cool down to 800°C in a nitrogen atmosphere ℃, stop feeding nitrogen, change to methane / nitrogen mixed gas (methane and nitrogen volume ratio 1:8), keep warm at 800°C for 30min, then cool to room temperature and add 10wt% dilute sulfuric acid to the activated product, at 70°C After washing under water for 180 min, the product was separated by filtration and washed with water until the pH value of the filtrate was neutral, and the solid product was dried at 150°C for 5 h to obtain activated carbon AC-3. The accessibility A of AC-3 is 1.7, and the specific surface area is 1521m 2 / g, 3.5MPa, 25°C methane adsorption capacity is 201mL / (g, STP).

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Abstract

The invention discloses activated carbon as well as a preparation method and application thereof. The accessibility A of the activated carbon is 1.4-2.2, wherein the accessibility A is a parameter for representing the methane adsorption and storage performance of the activated carbon. The preparation method of the activated carbon comprises the following steps: firstly, uniformly mixing petroleum coke, an activating agent and a transition metal compound, and performing activation reaction; and washing and drying the obtained activated product to obtain the activated carbon. The activated carbon obtained by the method is reasonable in pore distribution, has a proper specific surface area, has micropores capable of adsorbing a large amount of methane and mesopores capable of accelerating mass transfer, and has the advantages of good methane storage effect, simple preparation method and the like.

Description

technical field [0001] The invention belongs to the technical field of carbon material preparation, and in particular relates to an activated carbon and its preparation method and application. Background technique [0002] Among the traditional fossil energy sources, natural gas is expected to become the preferred energy source to replace coal and oil due to its advantages such as abundant reserves, high calorific value, and no pollution. Compared with conventional liquid fuels, the main disadvantage of natural gas is its low volumetric energy density, which is only 0.11% of that of gasoline. Therefore, how to realize high-capacity storage of natural gas and increase the volumetric energy density of natural gas has become the key to limit its wide-scale application. Especially for the large-scale promotion of natural gas vehicles (NGV), which have developed rapidly in recent years. [0003] At present, there are four main storage technologies for natural gas: compressed nat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/348C01B32/30C01B32/33B01J20/20B01J20/28
CPCC01B32/348C01B32/30C01B32/33B01J20/20B01J20/28011B01J20/205B01J2220/4887
Inventor 蔡海乐张舒冬张庆军马锐齐新鸿宋永一刘继华乔凯方向晨
Owner CHINA PETROLEUM & CHEM CORP
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