A kind of activated carbon and its preparation method and application in desulfurization

Abstract

The invention provides an activated carbon and its preparation method and its use in desulfurization. The activated carbon includes a carrier and an active component loaded on the carrier, and the carrier is an activated carbon with a mesoporous and microporous dual-stage channel structure. , the active component includes oxygen-containing functional groups, and the oxygen-containing functional groups include any one or at least two of carboxyl, ester, aldehyde or ether groups and hydroxyl groups, and the active components also include carbonates and / or bicarbonate, the activated carbon is used in gas desulfurization, and has triple functions of adsorption and storage, catalytic oxidation and catalytic hydrolysis for sulfide; the present invention adopts the repeated mode of sulfur-containing gas adsorption oxidation reaction and carbon thermal regeneration reaction to prepare The two-stage pore structure of the activated carbon has simple process and low preparation cost.

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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