Method for preparing coal-based porous carbon material through trace calcium addition and catalytic activation
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A porous carbon material, catalytic activation technology, applied in chemical instruments and methods, inorganic chemistry, carbon compounds, etc., can solve the problems of large amount of activator in chemical activation method, underdeveloped pore structure of porous activated carbon material, etc. The effect of coal pretreatment process, wide adaptability of coal types, and easy to scale up production
Pending Publication Date: 2018-11-09
HARBIN INST OF TECH
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[0004] The present invention aims to solve the problem that the pore structure of the porous activated carbon material obtained by the physical activation method is underdeveloped and the amount of activator required by the chemical acti...
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specific Embodiment approach 1
[0039] Specific implementation mode 1: In this implementation mode, the method for preparing coal-based porous carbon materials by adding a trace amount of calcium to catalytic activation is carried out in the following steps:
[0040] 1. Raw material refinement
[0041] Crushing, grinding and sieving coal raw materials in sequence to obtain fine coal powder;
[0042] The particle size of the pulverized coal is 40 mesh to 200 mesh;
[0043] 2. Ball milling and mixing
[0044] Mix fine coal powder and calcium source, and ball mill for 1h-8h to obtain the mixture;
[0045] The calcium source is a mixture of one or more of anhydrous calcium chloride, calcium sulfate, calcium hydroxide, calcium carbonate, calcium nitrate, calcium formate, calcium acetate, calcium citrate, and calcium gluconate in any proportion;
[0046] The mass ratio of the refined coal powder to the calcium element in the calcium source is 1: (0.001-0.05);
[0047] 3. High temperature activation
[0048] Put...
specific Embodiment approach 2
[0059] Embodiment 2: This embodiment differs from Embodiment 1 in that the coal raw material in step 1 is a mixture of one or more of lignite, bituminous coal, sub-bituminous coal or anthracite in any proportion. Other steps and parameters are the same as those in the first embodiment.
specific Embodiment approach 3
[0060] Embodiment 3: This embodiment differs from Embodiment 1 or Embodiment 2 in that: the rotational speed of the ball mill during the ball milling in step 2 is 100r / min-500r / min, and the material of the ball milling tank is agate or stainless steel. Other steps and parameters are the same as those in Embodiment 1 or 2.
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Abstract
The invention discloses a method for preparing a coal-based porous carbon material through trace calcium addition and catalytic activation and relates to a preparation method of a porous carbon material. The invention aims to solve the problems in the traditional preparation method of the coal-based porous carbon material that the porous carbon material obtained by physical activation is under-developed in pore structure and the usage amount of an activating agent needed in the chemical activation preparation process is great. The preparation method disclosed by the invention comprises the following steps: taking coal as a raw material, enabling a calcium source to be distributed in a coal matrix by virtue of a ball-milling mixing process of trace organic or inorganic calcium source and coal, obtaining a coal-based porous carbon material by virtue of a catalytic activation process and a process of removing calcium containing compounds, and regulating the pore matching and pore parameters of the obtained coal-based porous carbon by virtue of the calcium source and the content, thereby obtaining the micro-porous carbon material and hierarchical pore carbon material. The specific surface area of the obtained coal-based hierarchical pore carbon can reach 1535m<2>/g, and the pore volume can reach 1.66cm<3>/g. The method disclosed by the invention is applicable to deep regulation ofthe porous carbon material pore structure, and has application prospects in the fields of adsorption of gas molecules and liquid molecules and super capacitor energy storage.
Description
technical field [0001] The invention relates to a preparation method of a porous carbon material. Background technique [0002] Porous activated carbon materials have shown important applications in the fields of adsorption, catalysis, and electrochemical energy storage due to their stable physical and chemical structure, easy regulation of pore and surface chemical properties, and environmental friendliness. According to the structure-effect mechanism, the adsorption and storage performance of porous carbon materials depends on the matching relationship between their pore structure and the molecular size of target substances (such as gas molecules, liquid phase molecules). Generally speaking, the microporous structure is conducive to the adsorption of small gas molecules, while the mesopore structure is conducive to the adsorption and storage of liquid phase molecules. The developed porous carbon materials include microporous carbon, ordered mesoporous carbon, and hierarch...
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