Activated carbon modification method for removing nitric oxide and nitrogen dioxide in air

Abstract

The invention provides an activated carbon modification method for removing nitric oxide and nitrogen dioxide in air. The method comprises the following steps: preparing activated carbon, dredging pores of the activated carbon, loading a catalyst on the surface of the activated carbon, preparing a dipping modification solution, preparing an ammonia water solution, controlling the heating temperature of an activation furnace, modifying the activated carbon, discharging redundant ammonia gas and carrying out cooling. According to the method, active carbon surface functional group modification and supported vanadium oxide (V2O5) combined modification are adopted, so the removal efficiency and the adsorption capacity of nitrogen oxides are improved, the problem of hole blockage caused by metal salt / alkali dipping precipitation is avoided, the problem of environment pollution caused by dipping substance falling is prevented, and meanwhile, the hydrophobicity of the active carbon is improved.

Description

technical field [0001] The invention relates to the application field of activated carbon in air purification, in particular to an activated carbon modification method for removing nitrogen monoxide and nitrogen dioxide in air. Background technique [0002] Activated carbon is a kind of highly adsorbable granular substance with porous and high specific surface area, which has a strong adsorption effect on gas molecular substances and small molecular substances in liquid solution; during the gas adsorption process of activated carbon, gas molecules can pass through The microporous structure of activated carbon, some gas molecules are attached to the active site of activated carbon and stay on the active site; the active site of activated carbon will lose its adsorption capacity after being occupied by gas molecules; the binding ability of each gas molecule to the active site of activated carbon Different, according to the different molecular binding ability, the separation of...

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Problems solved by technology

[0005] 1. The existing columnar activated carbon activated by conventional water vapor or KOH is mainly physical adsorption, and its adsorption capacity for nitrogen dioxide and nitrogen monoxide is low;

[0006] 2. Existing modification methods for NOx-removing activated carbon mostly adopt the method of loading potassium hydroxide or potassium carbonate for modification. The precipitation of loads on the surface of activated carbon will block the pores of activated carbon and seriously affect the adsorption capacity of activated carbon for gaseous small molecules, resulting in The removal efficiency of nitric oxide gas is significantly reduced, which is not conducive to the comprehensive adsorption effect of NOx (nitrogen monoxide and nitrogen dioxide) gas;

[0007] 3. Excessive loading of metal catalysts and other catalysts to modify activated carbon, the impregnation is easy to fall off, polluting the customer's site environment, especially the production environment with high requirements for cleanliness;

[0008] 4. The traditional impregnation method to remove NOx activated carbon leads to an increase in the metal content on the surface of the activated carbon, a decrease in the hydrophobic capacity of the activated carbon, and an increase in the water absorption capacity, which leads to an increase in the water content of the activated carbon and reduces the purification effect of the activated carbon.

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