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Preparation method of simultaneous desulfurization and denitration adsorbent of molecular sieve/alumina core-shell structure

A core-shell structure, desulfurization and denitrification technology, applied in separation methods, chemical instruments and methods, alkali metal oxides/hydroxides, etc. Effect

Active Publication Date: 2018-09-04
北京立博索恩环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although in recent years my country's SO 2 and NO x emissions have declined to a certain extent, but the total emissions are still high, and further efforts to reduce emissions are needed

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] a) 15g of aluminum sulfate is configured into an aqueous solution with a mass fraction of 10%, the reaction temperature is controlled at 30°C, and 20% ammonia water is added dropwise under conditions of ultrasonic and vigorous stirring until the pH of the solution is 9, at 2000r / min centrifuged at a high speed, and washed with deionized water several times to remove acid radicals, to obtain a solid for later use.

[0019] b) Add 500 mL of water to the above solid, activate it at 80° C. for 4 hours, centrifuge at a speed of 2500 r / min, and wash it with absolute ethanol to remove water. The resulting solid was used for later use.

[0020] c) Mix the solid, 1.2g ZSM-5 molecular sieve, 120mL of absolute ethanol and 1.5g of CTAB, stir well, dry at 90°C for 12 hours, and finally bake at 800°C for 5 hours to obtain the core-shell structure Adsorbent A.

Embodiment 2

[0022] a) 12g of aluminum nitrate is configured into an aqueous solution with a mass fraction of 12%, the reaction temperature is controlled at 40°C, and 25% ammonia water is added dropwise under conditions of ultrasonic and vigorous stirring until the pH of the solution is 8, at 1400r / min centrifuged at a high speed, and washed with deionized water several times to remove acid radicals, to obtain a solid for later use.

[0023] b) Add 450 mL of water to the above solid, activate it at 90° C. for 2 hours, centrifuge at 800 r / min, wash with absolute ethanol to remove water. The resulting solid was used for later use.

[0024] c) Mix the solid, 2.0g SAPO-34 molecular sieve, 100mL of absolute ethanol and 1.2g of PVA, stir well, dry at 100°C for 10 hours, and finally roast at 900°C for 6 hours to obtain the core-shell structure Adsorbent B.

Embodiment 3

[0026] a) 8g aluminum chloride is configured into an aqueous solution with a mass fraction of 8%, and the controlled reaction temperature is 50° C., and 28% ammonia water is added dropwise under conditions of ultrasound and vigorous stirring until the pH value of the solution is 10. Centrifuge at a speed of 1 min, wash with deionized water several times to remove acid radicals, and obtain a solid for future use.

[0027] b) Add 600 mL of water to the above solid and then activate it at 70° C. for 5 hours, centrifuge at a speed of 1000 r / min, wash with absolute ethanol to remove water. The resulting solid was used for later use.

[0028] c) Mix the solid, 1.8g zeolite molecular sieve, 80mL of absolute ethanol and 3g of urea, mix well, dry at 120°C for 11 hours, and finally roast at 1000°C for 3 hours to obtain the core-shell structure adsorbent C .

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PUM

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Abstract

The invention relates to a preparation method of a simultaneous desulfurization and denitration adsorbent of a molecular sieve / alumina core-shell structure. An adsorbent of the core-shell structure and a specific porous structure is prepared by using a molecular sieve as a core material by utilizing the characteristics of a porous channel of the molecular sieve and mesoporous aluminium oxide as ashell and by ultrasonically dispersing a certain amount of molecular sieve nanoparticles into a solution for preparing mesoporous aluminum oxide. By applying the adsorbent to a simultaneously desulfurization and denitrification technology by utilizing a special structure of the adsorbent and the size of the porous channel of core and shell materials, a result discovers that the adsorbent is capable of effectively weakening competitive adsorption of SO2 and NOx, and higher simultaneous desulfurization and denitration performance is obtained. The adsorbent of the core-shell structure, prepared by the preparation method disclosed by the invention, is simple in technology, stable in property, large in adsorption capacity, simple and convenient in application operation and good in economic benefit, environmental benefit and social benefit.

Description

technical field [0001] The invention belongs to the technical field of materials and environmental protection, and in particular relates to a preparation method of a molecular sieve / alumina core-shell structure simultaneous desulfurization and denitrification adsorbent. Background technique [0002] SO 2 and NO x All of them are air pollutants in our country. Excessive emissions will cause smog, acid rain and photochemical smog, which seriously endanger the health of animals and plants, the ecological environment and even human health. The combustion of fossil fuels is SO 2 and NO x main source of . Although in recent years my country's SO 2 and NO x The emission has decreased to a certain extent, but the total emission is still relatively high, and the emission reduction work needs to be further strengthened. [0003] At present, the most commonly used desulfurization and denitrification technologies in the industry are separate processes, such as calcium-based wet d...

Claims

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Application Information

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IPC IPC(8): B01J20/16B01J20/28B01J20/30B01D53/02
CPCB01D53/02B01D2257/302B01D2257/40B01J20/0248B01J20/16B01J20/28014
Inventor 易红宏杨昆唐晓龙黄永海时屹然解锡舟
Owner 北京立博索恩环保科技有限公司
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