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Preparation method of NOx adsorbent operated at room temperature

An adsorbent and room temperature technology, applied in the direction of separation methods, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problems of low-concentration NOx adsorption and removal, and achieve the effect of not being easy to heat and spontaneously ignite and having good thermal stability

Active Publication Date: 2014-04-23
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Claims
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AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the shortcoming that the existing materials cannot effectively adsorb and remove low-concentration NOx at room temperature, thereby preparing an adsorbent that can effectively adsorb NOx in the air at room temperature, and is used to treat indoor air or semi- Air in enclosed spaces offers a new technological solution

Method used

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preparation example Construction

[0011] The preparation method of a nitrogen oxide adsorbent with high adsorption capacity provided by the invention is characterized in that the method comprises the following steps:

[0012] 1) Pretreatment of activated carbon carrier: Disperse activated carbon in 0.1M-10M nitric acid solution, the mass ratio of liquid to solid is 1:1-1:100, heat to 40-90°C under stirring and reflux, and oxidize for 5-20 hours Filter washed and air dried to constant weight;

[0013] 2) Metal element loading: Dissolve soluble cerium salt and soluble transition metal salt in water, wherein the molar ratio of cerium element to transition metal element is between 9:1 and 5:5, and put the activated carbon prepared in step 1) into the containing In the aqueous solution of soluble cerium salt and soluble transition metal salt, heat under stirring, so that the solvent is gradually evaporated to dryness at the boiling point of the solvent itself, and then in any one or any mixture of nitrogen, helium,...

Embodiment 1

[0017] Add 2000g of activated carbon particles (30 mesh size) into 200kg of 0.1M nitric acid, oxidize at 90°C for 5hr under stirring and reflux, filter out the activated carbon, wash thoroughly and dry in air to constant weight;

[0018] Dissolve 0.002mol of cobalt(II) nitrate and 0.018mol of cerium(III) nitrate in 500mL of water, add the above-mentioned activated carbon, and heat to 100°C under stirring to evaporate to dryness (the loading capacity of Ce+Co is 0.0001mol / 10g of activated carbon ), and then fired in a muffle furnace at 300°C under a nitrogen atmosphere for 6 hours to obtain an adsorption material capable of absorbing nitrogen oxides at room temperature, which can treat more than 100,000 bed volumes of air containing 1ppmNOx at room temperature.

Embodiment 2

[0020] Add 333.33g of activated carbon to 333.33g of 10M nitric acid, oxidize at 40°C for 20hrs under stirring and reflux, filter out the activated carbon, fully wash and dry in air to constant weight;

[0021] Dissolve 0.05mol of manganese (II) nitrate and 0.1mol of cerium (III) nitrate in 200mL of water, add the above-mentioned activated carbon, heat under stirring to evaporate to dryness (the loading capacity of Ce+Mn is 0.0045mol / 10g activated carbon), and then Burn in a muffle furnace at 600°C for 2 hours under a nitrogen atmosphere to obtain an adsorption material capable of absorbing nitrogen oxides at room temperature, which can treat more than 100,000 bed volumes of air containing 1 ppm NOx at room temperature.

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Abstract

The invention relates to a preparation method of a NOx adsorbent operated at a room temperature, and belongs to the technical fields of material preparation, environmental purification and waste gas treatment. The method comprises the following steps: with manganese (or cobalt) and cerium as main catalytic oxidation components and activated carbon as a NOx absorbing component, performing an impregnation method to obtain an activated carbon material carried with manganese (or cobalt) and cerium; and firing the activated carbon material under the atmosphere of inert gases, thereby obtaining an adsorbing material capable of effectively absorbing the NOx in the air at the room temperature. Thus, the NOx adsorbent provided by the invention has good application prospects in air purification of special environments such as plants in which the NOx and HN03 are operated, highway tunnels and central air-conditioners of contaminated regions.

Description

technical field [0001] The invention relates to a method for preparing a NOx adsorbent operated at room temperature, and belongs to the technical fields of material preparation, environmental purification and waste gas treatment. Background technique [0002] Nitrogen oxides (NOx) are one of the most important air pollutants in my country. Its sources are very extensive, coal-fired boilers, lime kilns, glass kilns, cement kilns, sintering machines in steel plants and motor vehicles all release NOx pollution. When NOx, sulfur oxides (SOx) and volatile organic compounds (VOCs) in the atmosphere cause combined pollution to the atmosphere, the haze particles in the atmosphere will explode. The reason for the high particle concentration. Many technologies for NOx treatment have been released: For NOx in motor vehicle exhaust, three-way catalysis is generally used to eliminate it, that is, the reaction of hydrocarbon oxidation and NOx reduction to nitrogen occurs on the surface ...

Claims

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Application Information

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IPC IPC(8): B01J20/20B01J20/30B01D53/02B01J23/83B01J23/34
Inventor 刘海弟李伟曼李文辉陈运法
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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