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NOx adsorbent

An adsorbent and grinding technology, applied in other chemical processes, dispersed particle separation, chemical instruments and methods, etc., can solve the problems of complex adsorbent preparation methods, short adsorbent replacement cycle, low adsorption efficiency, etc. Adsorption reaction rate, long replacement cycle, and the effect of improving adsorption efficiency

Active Publication Date: 2014-12-10
BEIJING GENERAL RES INST OF MINING & METALLURGY +1
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  • Abstract
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  • Application Information

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Problems solved by technology

Such as Chinese patent 85105415 (publication number CN85105415A, date of announcement: 1985.7. 16) discloses a kind of adsorbent that can control multiple acid gases, and it is made of alkaline earth metal hydroxide, aluminosilicate and active carbon by weight percentage: 20 ~30:40~60:3~30, in practical application, this adsorbent has the problems of low adsorption rate, short adsorbent replacement period, etc. x Poor processing effect
Chinese patent 200610165556.1 (publication number CN1994554A, date of announcement: 2007.7.11) discloses a preparation method of a composite adsorbent for removing nitrogen oxides. The modified or salt-soaked zeolite powder and calcium hydroxide powder are calculated as follows: 1 :1~2:1 mixed preparation, but the preparation method of this adsorbent is relatively complicated, and also has the problems of short adsorbent replacement cycle and low NO adsorption efficiency

Method used

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  • NOx adsorbent
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Examples

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Effect test

Embodiment 1

[0025] This example is an example of low-concentration nitrogen oxide treatment, and the exhaust gas is a laboratory simulation of different concentrations of NO x Emissions, using pure NO from gas cylinders 2 Gas, experimental gas volume 2L / min.

[0026] The raw material weight ratio of the adsorbent of this embodiment is lime 30%, natural zeolite 25%, sodium bentonite 23%, activated carbon 20%, metal oxide 2%, and this adsorbent is prepared by the following method: first each raw material is respectively Grinding, mixing, adding water and stirring evenly, then aging; after aging, extruding it into thin strips with a diameter of 2 mm on the extruder, and then breaking it into small sections with a length of 3 mm, and then extruding it several times to produce the finished product. The finished product is naturally air-dried at room temperature, sent to a far-infrared drying oven, and dried to a constant mass to become the finished adsorbent.

[0027] After testing, the inle...

Embodiment 2

[0031] This example is an example of high-concentration nitrogen oxide treatment, and the exhaust gas is NO-containing gas produced by silver dissolution x Exhaust gas, the gas volume is 1000~8000m 3 / h fluctuates.

[0032] The weight ratio of the raw materials of the adsorbent in this embodiment is 30% of lime, 25% of natural zeolite, 25% of sodium bentonite, 19% of activated carbon, and 1% of metal oxide; Grind, add water, mix and stir evenly, and then age; then, extrude it into thin strips with a diameter of 2.5 mm on the extruder, and then break it into small pieces with a length of 4 mm. After multiple extrusions, the finished product is produced. Naturally air-dried at room temperature, sent to a far-infrared drying box, and dried to a constant mass to become the finished product of the adsorbent.

[0033] NO in this example x Before entering the adsorption device, the waste gas is treated in the purifier equipped with the adsorbent of this embodiment after multi-stag...

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Abstract

The invention discloses a NOx adsorbent, and belongs to the field of an adsorbent for controlling atmospheric contamination. The adsorbent comprises lime, natural zeolite, bentonite, activated carbon and metal oxide. Various components are mixed, watered and aged after being respectively levigated, and then are dried into constant mass after being extruded and molded, so as to prepare the NOx adsorbent. According to the adsorbent, the adsorption efficiency of NOx is effectively improved by organic combination of the lime, the natural zeolite, the bentonite, the activated carbon and the metal oxide, the NOx adsorbent has the characteristics of fast purification speed, good treatment effect, large adsorption capacity and long exchange cycle, and has high treatment efficiency on NOx with different concentrations, and the removal effect of the adsorbent on the NOx is much better than that of an existing adsorbent under the same experiment condition.

Description

technical field [0001] The present invention relates to a NO x Adsorbent, suitable for removing NO in exhaust gas at room temperature x , especially suitable for high concentration, intermittent NO x The removal belongs to the technical field of air pollution control. Background technique [0002] NO produced by human activities x It mainly comes from the high-temperature combustion process of fossil fuels, represented by coal-fired flue gas in thermal power plants, which has the characteristics of large amount of flue gas and continuous emission. The second is nitric acid use processes such as nitric acid production in chemical production, nitrification process, explosives production and nitric acid treatment on metal surfaces. In these processes, NO x It will be discharged along with the discharge of nitric acid mist and other substances in the production process. For example, in the non-ferrous smelting industry, many enterprises use a large amount of nitric acid in ...

Claims

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Application Information

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IPC IPC(8): B01J20/20B01D53/02
Inventor 王芳王维海赵志龙杨晓松周连碧黄羽飞宋文涛
Owner BEIJING GENERAL RES INST OF MINING & METALLURGY
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