Activated carbon and preparation method thereof, and application of activated carbon in desulfurization

Abstract

The invention provides activated carbon and a preparation method thereof, and application of the activated carbon in desulfurization. The activated carbon comprises a carrier and an active component loaded on the carrier, wherein the carrier is activated carbon with a mesoporous-microporous two-stage pore channel structure, the active component comprises an oxygen-containing functional group, theoxygen-containing functional group comprises any one or at least two selected from a carboxyl group, an ester group, an aldehyde group and an ether group and also comprises a hydroxyl group, and the active component further comprises carbonate and / or bicarbonate. The activated carbon is used in gas desulfurization and has triple functions of adsorption storage, catalytic oxidation and catalytic hydrolysis on sulfide. According to the invention, the two-stage pore channel structure of the activated carbon is prepared in a mode of cyclically repeating an adsorption oxidation reaction of sulfur-containing gas and a thermal regeneration reaction of carbon; and a technological process is simple, and preparation cost is low.

Description

technical field [0001] The invention relates to the technical field of activated carbon preparation, in particular to an activated carbon, its preparation method and its use in desulfurization. Background technique [0002] Carbonyl sulfide (COS) is a colorless gas with the smell of rotten eggs at normal temperature and pressure. It is flammable and highly toxic, and can be hydrolyzed into H 2 S, widely exists in industrial exhaust. When COS diffuses into the atmosphere, it will be oxidized to SO 2 Then dissolve in water vapor to form acid rain, causing serious damage to the environment. Therefore, the removal of COS is of great significance to industrial production and environmental protection. [0003] Among COS removal methods, catalytic hydrolysis is widely used in industry due to its low reaction temperature, no need for additional hydrogen source, and high desulfurization efficiency. Currently used COS hydrolysis catalysts include Al 2 o 3 base catalyst, TiO 2 b...

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Problems solved by technology

[0004] CN103432897A discloses a nitrogen-rich porous carbon desulfurizer and its preparation method. The desulfurizer is composed of activated carbon pretreated by surface oxidation and oxygen-containing functional groups and nitrogen-containing functional groups loaded on the surface of the activated carbon, thereby improving the desulfurization capacity, but its Mainly used to remove SO 2 , not used to remove COS

[0005] CN101703928A discloses a low-temperature hydrolysis COS activated carbon-based catalyst and its preparation method. The prepared activated carbon is sequentially impregnated with a metal oxide solution and an alkali solution, so that the COS in the gas can be removed, and the H 2 S is removed together, but the adsorption and storage effect of COS is not good

[0006] CN111135793A discloses renewable high-efficiency deep desulfurization activated carbon and its preparation method. In the predetermined pore structure of activated carbon, functional groups are introduced, and metal compounds are loaded at the same time, which strengthens the desulfurization effect and prolongs the service life of activated carbon. It is suitable for the removal of petrochemical products. sulfide, but lacks the adsorption storage and catalytic hydrolysis of sulfide, and has a single desulfurization function

[0007] The existing desulfurization activated carbon focuses more on the exploration of its load, and there are not many studies on the modification of activated carbon itself. There are still problems such as incomplete desulfurization and high cost of activated carbon modification.

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