3D nanoflower-shaped MnCrOX-coated sepiolite low-temperature denitration catalyst and preparation method thereof

A low-temperature denitrification and sepiolite technology, applied in the field of flue gas denitrification, can solve the problems of difficult fixation of active components, complicated process preparation and high denitration temperature, and achieve the effects of enhancing redox capacity, simple process and increasing specific surface area.

Active Publication Date: 2018-06-01
CHANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention aims at the existing denitrification catalyst carrier which is not easy to form, the process preparation is complicated, the specific surface area is small, the active components are not easy to fix on the catalyst carrier, the denitrification temperature is high, and the simple MnO X Catalysts are susceptible to SO 2 Poisoning, narrow activity window and many other disadvantages

Method used

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  • 3D nanoflower-shaped MnCrOX-coated sepiolite low-temperature denitration catalyst and preparation method thereof
  • 3D nanoflower-shaped MnCrOX-coated sepiolite low-temperature denitration catalyst and preparation method thereof
  • 3D nanoflower-shaped MnCrOX-coated sepiolite low-temperature denitration catalyst and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] (1) Dissolve 5g of raw soil sepiolite in 150mL of H with a concentration of 1mol / L 2 SO 4 In the solution, stir and react for 4 hours at a speed of 300r / min, the purpose is to remove impurities, and at the same time move hydroxyl groups on the surface of sepiolite. After the reaction is finished, filter with suction, wash and dry, and use it as a carrier for future use.

[0024] (2) Take 0.5 g of the carrier prepared in step 1, grind and sieve, disperse in 300 mL of deionized water, stir and sonicate for about 30 min. Take 0.80g of potassium permanganate and add it to the above-mentioned carrier, stir and dissolve until uniform. Dissolve 0.68g of chromium nitrate nonahydrate in 50mL of deionized water, and further add to the above mixed solution so that the pH value of the mixed solution is in the range of 1 to 3 (add glacial acetic acid to adjust if necessary), and stir at 80°C and 300r / min , condensed and refluxed for 4 hours, suction filtered after the reaction, w...

Embodiment 2

[0029] Similarly, 0.5 g of the sepiolite carrier prepared in step (1) of Example 1 was dispersed in 300 mL of deionized water, stirred and sonicated for about 30 min. Take 0.27g of potassium permanganate and add it to the above-mentioned carrier, stir and dissolve until uniform. Dissolve 0.68g of chromium nitrate nonahydrate in 50mL of deionized water, and further add to the above mixed solution so that the pH value of the mixed solution is in the range of 1 to 3 (add glacial acetic acid to adjust if necessary), and stir at 80°C and 300r / min , condensed and refluxed for 4 hours, suction filtered after the reaction, washed until neutral, dried at 60°C, and roasted at 350°C for 2 hours to obtain nano-flower-like MnCrO X (1:1) / sepiolite low temperature denitrification catalyst.

Embodiment 3

[0031] Similarly, 0.5 g of the sepiolite carrier prepared in step (1) of Example 1 was dispersed in 300 mL of deionized water, stirred and sonicated for about 30 min. Take 1.33g of potassium permanganate and add it to the above-mentioned carrier, stir and dissolve until uniform. Dissolve 0.68g of chromium nitrate nonahydrate in 50mL of deionized water, and further add to the above mixed solution so that the pH value of the mixed solution is in the range of 1 to 3 (add glacial acetic acid to adjust if necessary), and stir at 80°C and 300r / min , condensed and refluxed for 4 hours, suction filtered after the reaction, washed until neutral, dried at 60°C, and roasted at 350°C for 2 hours to obtain nano-flower-like MnCrO X (5:1) / sepiolite low temperature denitrification catalyst.

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Abstract

The invention belongs to the field of flue gas denitration, particularly relates to a 3D nanoflower-shaped MnCrOX-coated sepiolite low-temperature denitration catalyst and a preparation method thereof. The method prepares a nanoflower-shaped MnCrOX coated with the clay sepiolite to form a three-dimensional structure catalyst. The catalyst uses low-cost clay sepiolite as a carrier, and uses a hydrothermal method for in-situ growth of flower-shaped MnCrOX as an active component, and coats the surface of the sepiolite to form a 3D structure catalyst for low-temperature denitration. The 3D nanoflower-shaped MnCrOX-coated sepiolite low-temperature denitration catalyst and the preparation method thereof has the advantages of a preparation process is simple, economical, and does not require any template, the catalyst is easy to be molded, a specific surface area and the redox ability of the catalyst are enhanced, the activity reaction temperature is effectively reduced, the denitration activity and the sulfur resistance are improved, and the activity window is wide, and the like.

Description

technical field [0001] The invention belongs to the field of flue gas denitrification, in particular to a 3D nano-flower MnCrO X Coated sepiolite low-temperature denitrification catalyst and preparation method thereof. Background technique [0002] Nitrogen oxides have become second only to inhalable particulate matter and SO 2 The important air pollutants mainly come from two aspects: natural sources and man-made sources. As an important component of air pollutants, it is the main cause of disasters such as acid rain and photochemical smog, and has a great impact on human health and the ecological environment. Therefore, chemical methods are used to treat NO emitted in the environment x (NO / N 2 O / NO 2 ), making it a non-toxic N 2 Change is very important. Selective catalytic reduction (selective catalytic reduction, SCR) is the most widely used flue gas denitrification technology in the world today, and a hot research topic of SCR catalysts today is denitrification c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/34B01J35/02B01D53/56B01D53/86
CPCB01D53/8628B01J23/002B01J23/34B01J35/02
Inventor 罗士平黄晓艳谢爱娟唐毅然周兴蒙姚超李霞章左士祥
Owner CHANGZHOU UNIV
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