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Method for recycling carbon-based microporous materials to treat nitrogen oxide waste gas

A technology of microporous materials and nitrogen oxides, applied in chemical instruments and methods, separation methods, gas treatment, etc. Poor reusability, poor adsorption performance, etc., to achieve high-performance recycling, rapid and thorough reduction reaction, and improved adsorption performance

Active Publication Date: 2020-04-28
郑经堂
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, the reusability of carbon-based microporous materials such as AC and ACF is poor. This is because the surface of carbon-based materials is easily oxidized by nitrogen dioxide-like complexes formed by nitric oxide and oxygen to form acidic oxygen-containing energy groups. Acidic oxygen-containing functional groups are not conducive to the adsorption of nitric oxide. As the number of cycles increases, its adsorption performance will become worse and worse. Studies have shown that carbon-based microporous materials will lose their adsorption capacity after heating and cycling for 2-3 times. The adsorption capacity of nitric oxide leaves only the oxidative capacity, but its oxidative capacity alone is not sufficient to achieve high removal rates in the presence of relative humidity
Existing research is mainly carried out under the condition of zero relative humidity, and there is no relevant achievement on the efficient and repeated use of carbon-based microporous materials to adsorb nitrogen oxides in exhaust gas, especially nitric oxide.

Method used

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  • Method for recycling carbon-based microporous materials to treat nitrogen oxide waste gas
  • Method for recycling carbon-based microporous materials to treat nitrogen oxide waste gas
  • Method for recycling carbon-based microporous materials to treat nitrogen oxide waste gas

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Effect test

Embodiment 1

[0047] Embodiment 1: by above-mentioned (one) method preparation simulation gas, record relative humidity is 40%, oxygen volume fraction is 10.3%, nitric oxide volume fraction is 520ppm, makes gas pass through the adsorption column in above-mentioned (two), simultaneously Start timing, record the concentration of nitric oxide every 10 minutes, absorb for a total of 150 minutes, and make a curve of the transient removal rate of nitric oxide with time (see figure 1 ).

[0048] Take out the above-mentioned activated carbon after 150 minutes of adsorption, put it in the reaction kettle, add 1.25ml of ammonia solution with a mass concentration of 7%, mix it, place the closed reaction kettle in an oven at 180°C, stop heating after 30 minutes, and open the reaction kettle after cooling down , then heated and dried at 180°C for 90 minutes, took out the dried activated carbon, cooled to room temperature, repeated the above steps and used the regenerated activated carbon to carry out th...

Embodiment 2

[0049] Embodiment 2: according to above-mentioned (1) method preparation simulated gas, record relative humidity is 40%, oxygen volume fraction is 10.3%, nitric oxide volume fraction is 520ppm, makes gas pass through the adsorption column in above-mentioned (two).

[0050] Take out the above-mentioned activated carbon after 150min of adsorption, put it in the reaction kettle, add 2.5ml of ammonia solution with a mass concentration of 7%, mix, put the closed reaction kettle in an oven at 200°C, stop heating after 30min, and open the reaction kettle after cooling down , and then heated and dried at 180°C for 90 minutes, took out the dried activated carbon, cooled to room temperature, and repeated the above steps to use the regenerated activated carbon for adsorption.

Embodiment 3

[0051] Embodiment 3: prepare simulated gas by above-mentioned (1) method, record relative humidity is 40%, oxygen volume fraction is 10.3%, nitric oxide volume fraction is 520ppm, makes gas pass through the adsorption column in above-mentioned (two).

[0052] The activated carbon after the above-mentioned adsorption for 150min was taken out, placed in a reaction kettle, added with 5ml of ammonia solution with a mass concentration of 7%, mixed, the closed reaction kettle was placed in an oven at 190°C, and the heating was stopped after 30min, and the reaction kettle was opened after cooling down. Reheat and dry at 180°C for 90 minutes, take out the dried activated carbon, cool to room temperature, repeat the above steps and use the regenerated activated carbon for adsorption.

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Abstract

The invention provides a method for recycling carbon-based microporous materials to treat nitrogen oxide waste gas, which belongs to the field of nitrogen oxide waste gas treatment and can efficiently and repeatedly utilize carbon-based microporous materials to absorb nitrogen oxide waste gas at normal temperature. The method for recycling carbon-based microporous materials to treat nitrogen oxide waste gas comprises the following steps: (1) stacking carbon-based microporous materials in an adsorption column, and feeding nitrogen oxide waste gas at normal temperature for adsorption; (2) completing the adsorption Finally, take out the carbon-based microporous material that absorbs nitrogen oxide waste gas, place it in a reactor, add a reducing agent, mix, and heat the reactor after sealing; (3) After heating, cool down, open the reactor, and then heat and dry. Take out the dried carbon-based microporous material, cool it to room temperature, stack it in the adsorption column, and repeat the operation of steps (1)-(2).

Description

technical field [0001] The invention relates to the field of nitrogen oxide waste gas treatment, in particular to a method for recycling carbon-based microporous materials to treat nitrogen oxide waste gas. Background technique [0002] Nitrogen oxides can cause environmental problems such as acid rain, photochemical smog, and ozone layer depletion, and are mainly composed of nitrogen monoxide and nitrogen dioxide. Nitrogen dioxide is easily soluble in water or lye and is also easily absorbed, and can be removed by absorption method, while nitric oxide, as a supercritical fluid, has relatively stable chemical properties and is difficult to remove by ordinary lye absorption method or urea reduction method , but the nitrogen oxides in smoke and vehicle exhaust are mainly composed of low concentrations of nitric oxide. For the treatment of nitrogen oxide waste gas, the selective catalytic reduction method is mainly used in industry. This method uses ammonia as a reducing agent...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/04B01J20/34B01J20/20
CPCB01D53/04B01D53/0446B01D2253/102B01D2257/404B01D2259/40092B01J20/20B01J20/3416B01J20/3475B01J20/3483
Inventor 郑星郑经堂曹小青
Owner 郑经堂
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