Ammonia gas adsorbent and preparation method thereof

A technology of adsorbent and ammonia gas, which is applied in the field of environmental purification, can solve the problems of difficult formation of porous materials, unreported adsorption effect of adsorbent, and influence on adsorption capacity, etc., and achieve the effect of easy desorption

Inactive Publication Date: 2019-04-30
SINOPEC YANGZI PETROCHEM +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this patent uses pure alkaline earth metal chloride as an adsorbent, which is difficult to form a stable porous material, has a small contact area with ammonia, and is easy to swell and agglomerate during the adsorption and desorption process, which affects the adsorption capacity.
[0005] Qingdao Boruilin New Material Co., Ltd. submitted a series of Chinese patents on modifying cinders by various methods to prepare cheap ammonia adsorbents, such as patents CN104069790A, CN104084111A, and CN104084133A, and found that ammonia can be removed by adsorption. However, the adsorption effect of the adsorbent has not been reported in this series of patent documents.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] (a) Dry 50g of activated carbon particles, cool to room temperature, add it to 75ml of NaOH solution (40% mass fraction), stir at 25°C for 12h, filter off the impregnation solution, wash with deionized water until neutral , dried at 110°C for 3 hours for later use;

[0029] (b) Ferric chloride is mixed with the solution that mass fraction is 8%;

[0030] (c) Add the activated carbon prepared in step (a) to the ferric chloride solution prepared in step (b) and soak for 3 hours, filter out the soaking solution, and dry it at 110°C for 4 hours for later use;

[0031] (d) Calcining the solid obtained in step (c) at 600° C. for 1.5 h under the protection of nitrogen to obtain an adsorbent for adsorbing ammonia.

[0032] After determination, the adsorbent obtained in Example 1 has a mass percent content of active component (ferric chloride) of 9.3%, and a mass percent content of carrier activated carbon of 90.7%. The specific surface area of ​​the adsorbent is 1104m 2 / g. ...

Embodiment 2

[0035] (a) Dry 50g of strip-shaped activated carbon, cool to normal temperature, add it to 100ml NaOH solution (30% mass fraction), stir at 25°C for 12h, filter off the impregnation solution, and wash with deionized water until medium It can be used after drying at 100℃ for 3 hours.

[0036] (b) Cupric chloride is made into a saturated solution.

[0037] (c) Add the activated carbon prepared in step (a) to the copper chloride solution prepared in step (b) and soak for 8 hours, filter out the soaking solution, dry at 90° C. for 6 hours, and set aside.

[0038] (d) Calcining the solid obtained in step (c) at 500° C. for 2 hours under the protection of nitrogen to obtain an adsorbent for adsorbing ammonia.

[0039] After determination, the adsorbent obtained in Example 2 has a mass percent content of active component (copper chloride) of 19.3%, and a mass percent content of carrier activated carbon of 80.7%. The specific surface area of ​​the adsorbent is 1021m 2 / g.

[0040]...

Embodiment 3

[0042] (a) Dry 50g of spherical activated carbon, cool to normal temperature, add it to 50ml NaOH solution (45% mass fraction), stir at 40°C for 8h, filter off the impregnation solution, wash with deionized water until neutral , dried at 100°C for 3 hours for later use.

[0043] (b) Cobalt chloride is made into a 10% solution.

[0044] (c) Add the activated carbon prepared in step (a) to the cobalt chloride solution prepared in step (b) and soak for 5 hours, filter out the soaking solution, dry at 110° C. for 3 hours and set aside.

[0045] (d) Calcining the solid obtained in step (c) at 700° C. for 1 h under the protection of nitrogen to obtain an adsorbent for adsorbing ammonia.

[0046] After determination, the adsorbent obtained in Example 3 has a mass percent content of active component (cobalt chloride) of 12.3%, and a mass percent content of carrier activated carbon of 87.7%. The specific surface area of ​​the adsorbent is 1081m 2 / g.

[0047] The adsorbent obtained...

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Abstract

The present invention discloses an ammonia gas adsorbent, which comprises 6-20 wt% of an active component and 80-94 wt% of a carrier, wherein the active component is a transition metal chloride, and the carrier is active carbon. The preparation method of the ammonia gas adsorbent comprises: immersing active carbon in a NaOH solution, filtering out the immersion liquid, and drying so as to be spare; preparing an ethanol solution with a certain concentration from at least one of the transition metal chlorides; adding the dried active carbon into the ethanol solution, completely immersing, and filtering out the immersing liquid; and roasting under an air-isolating condition to prepare the ammonia gas adsorbent. According to the present invention, the prepared ammonia gas adsorbent can adsorba large amount of ammonia gas under normal temperature and low temperature conditions, wherein the adsorption capacity can be up to 0.52 g/g; and the desorption is easy after the ammonia gas adsorbentadsorbs ammonia gas, such that the ammonia gas adsorbent can be recycled so as to achieve the environmental protection.

Description

technical field [0001] The invention belongs to the technical field of environmental purification, and in particular relates to an ammonia adsorbent and a preparation method thereof. Background technique [0002] Ammonia is an important chemical raw material, which is widely used in production and life. According to experts and scholars' research on the composition and causes of PM2.5, it is found that ammonia is one of the culprits in the formation of smog. In addition, in recent years, a large amount of volatile organic compounds have been used in indoor construction and decoration materials, causing indoor ammonia pollution and seriously affecting people's health. Therefore, how to reduce ammonia emissions and reduce the content of ammonia in the environment has become an urgent research solution question. [0003] The treatment of ammonia gas is mainly divided into emission source treatment and activity site treatment. At present, the methods of ammonia treatment mainl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/20B01J20/30B01D53/02
CPCB01D53/02B01D2257/406B01J20/0288B01J20/20
Inventor 魏延雨孙海龙
Owner SINOPEC YANGZI PETROCHEM
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