Method for adjusting matching combination of pores of coal-based porous carbon on basis of catalytic activation of trace amount of potassium source
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A catalytic activation, porous carbon technology, applied in chemical instruments and methods, inorganic chemistry, carbon compounds, etc., can solve the problems of insufficient specific surface area/pore development, high cost, large amount of activator, etc., to achieve low cost and reserves. large, development-promoting effect
Pending Publication Date: 2020-02-04
HARBIN INST OF TECH
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[0007] The purpose of the present invention is to solve the problem of insufficient specific surface area / pore development in the traditional physical activation method for preparing coal-based porous carbon, and the large amount of activator required by the chemical activation method and the high cost, and to provide a method based on trace potassium Source Catalytic Activation to Regulate Pore Assembly of Coal-Based Porous Carbon
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specific Embodiment approach 1
[0035] Specific implementation mode 1: A method of controlling the pore grouping of coal-based porous carbon based on catalytic activation of a trace potassium source in this embodiment is carried out according to the following steps:
[0036] 1. Raw material refinement
[0037] The raw coal is crushed, ground and screened in sequence to obtain fine coal powder or coal particles;
[0038] Second, the addition of potassium-based substances
[0039] Add potassium-based substances to fine coal powder or coal particles by physical mixing, liquid phase impregnation, ultrasonic infiltration or mechanical ball milling to obtain a uniform mixture;
[0040] The potassium-based substance is one or more of potassium carbonate, potassium chloride, potassium sulfate, potassium nitrate, potassium acetate, tripotassium phosphate, potassium dihydrogen phosphate, potassium monohydrogen phosphate, and potassium citrate in any proportion. mixture;
[0041] 3. High temperature activation
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specific Embodiment approach 2
[0048] Embodiment 2: This embodiment is the same as Embodiment 1 in that: the raw coal in step 1 is a mixture of one or more of lignite, bituminous coal, sub-bituminous coal or anthracite in any proportion. Others are the same as in the first embodiment.
specific Embodiment approach 3
[0049] Embodiment 3: This embodiment is the same as Embodiment 1 in that the mass ratio of the fine coal powder or coal particles in step 2 to the potassium element in the potassium-based substance is 1: (0.001-0.05). Others are the same as in the first embodiment.
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Abstract
The invention relates to a production method of porous carbon materials, in particular to a method for adjusting matching combination of pores of coal-based porous carbon on the basis of catalytic activation of a trace amount of a potassium source. The problems to be solved are that in a traditional physical activation production technology of coal-based porous carbon, a specific surface area / a pore structure is not fully developed, and in a chemical activation technology, the usage amount of an activator is large. According to the method for adjusting matching combination of the pores of thecoal-based porous carbon on the basis of catalytic activation of the trace amount of the potassium source, coal is used as a raw material, and by means of catalytic effects of potassium-based metal salts on physical activation processes, development of the pore volume and a specific surface area of porous carbon in a production process is enhanced. The method for adjusting matching combination ofthe pores of the coal-based porous carbon on the basis of catalytic activation of the trace amount of the potassium source comprises (1) raw material refining, (2) adding of potassium-based substances, (3) high-temperature activation, (4) cleaning of activated products and (5) drying. By changing the kinds and adding proportions of the potassium salts, deep adjustment of the average pore size andmatching combination of the pores is achieved, the specific surface area can be up to 1283.6 m<2> / g, and the total pore volume can be up to 0.93 cm<3> / g. By means of the method, the coal-based porouscarbon materials with excellent performance can be synthesized for different fields of catalysis, gas adsorption, separation and the like.
Description
technical field [0001] The invention relates to a preparation method of a porous carbon material, in particular to a method for regulating and controlling the pore grouping of coal-based porous carbon based on the catalytic activation of a trace potassium source. Background technique [0002] Porous carbon materials refer to carbon materials with pore structures of different sizes, and the size and shape of their internal pores can be adjusted according to actual application requirements. Porous carbon materials have the advantages of high chemical stability, adjustable physical and chemical structure, and a wide range of raw material sources. They have been widely used in the fields of pollutant adsorption, gas storage, water purification, catalysis, and photocatalysis. According to the definition of the International Union of Pure and Applied Chemistry, the pores in carbon materials are divided into three categories according to the pore size: micropores (pore diameter<...
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