Carbon dioxide sorbent based on ordered mesoporous carbon and preparation method

Abstract

The invention provides a carbon dioxide sorbent based on ordered mesoporous carbon and a preparation method. According to the preparation method, ordered mesoporous carbon is synthesized according to a solvent evaporation-induced self assembly (EISA) method, and supported polyethylene imine (PEI) modification is performed on ordered mesoporous carbon according to an impregnation method, so as to improve the hydrophobicity of the novel sorbent. The sorbent obtained according to the preparation method is uniform in pore size distribution and very high in orderliness; the sorbent adopts the structure of ordered mesoporous carbon, so that the heat stability is relatively high; the carbon dioxide adsorbing capacity of the sorbent and the hydrophobicity are relatively high. Therefore, based on such properties, the sorbent not only can adapt to a high-humidity environment, but also can be applied to an adsorbing process of which the temperature is above normal; meanwhile, the renewability is high, no pollutant is generated in the preparation process, and the technological process is environmentally friendly.

Description

technical field [0001] The invention relates to the field of material technology, and relates to a novel carbon dioxide adsorbent and a preparation method, in particular to a carbon dioxide adsorbent based on ordered mesoporous carbon and a preparation method. Background technique [0002] Since the industrial revolution, fossil fuels have been consumed in large quantities, and carbon dioxide emissions have increased sharply, leading to a series of global climate and environmental problems. How to reduce carbon dioxide emissions has become a hot spot of widespread concern at home and abroad. Among various carbon dioxide emission reduction technologies, carbon capture and storage technology (CCS) has attracted much attention, and new materials (adsorbents) and preparation methods for capturing carbon dioxide in industrial waste gas have developed rapidly. [0003] Among the commonly used carbon dioxide adsorbents, activated carbon is widely used because of its wide source of ...

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Problems solved by technology

[0003] Among the commonly used carbon dioxide adsorbents, activated carbon is widely used because of its wide source of production materials and low industrial production cost. It has developed microporous structure, large adsorption capacity and certain hydrophobicity, but the adsorption performance of carbon dioxide needs to be improved; Zeolite molecular sieve has strong adsorption capacity and good adsorption selectivity, but it is easily affected by water vapor in the adsorbed gas, and the adsorption capacity decreases significantly with the increase of temperature; the production process of silica gel is simple; polyester mesoporous materials and molecular sieves are suitable Materials for carbon dioxide adsorption, and among them, mesoporous molecular sieve materials are the hotspots of applied research

CN101372325A discloses "a carbon-nitrogen porous material and its hydrogen storage application" to prepare an ordered mesoporous carbon-nitrogen compound through the mesoporous silica hard template method, which has low cost, good cycle performance, and high hydrogen storage capacity. However, it is not aimed at the situation of carbon dioxide adsorption, its carbon dioxide adsorption performance has not been tested, and it has not been applied to the field of carbon dioxide adsorption; CN103315053A discloses "an activated carbon canister for adsorbing carbon dioxide" which provides a method for adsorbing carbon dioxide through activated carbon , but only limited to the direct utilization of activated carbon; CN101543762 disclosed "carbon dioxide adsorbent and its manufacturing method" uses amines to modify activated carbon, which can meet the industrial requirements for waste gas treatment. However, because its raw material is ordinary activated carbon, The pore size of the raw material is uneven and disordered. Although the adsorption performance of carbon dioxide after modification is improved, it is still insufficient compared with the case of using ordered mesoporous materials as raw materials.

[0004] Although many new adsorbents and preparation methods have been proposed, these technologies and methods are mainly aimed at the capture of carbon dioxide in dry industrial waste gas, while the actual industrial waste gas has complex components and usually contains a large amount of water vapor. Carbon dioxide adsorbents cannot be directly applied in such a high-humidity environment

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