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Denitration catalyst capable of resisting alkali metal poisoning and preparation method thereof

A denitrification catalyst, alkali metal technology, applied in the direction of catalyst activation/preparation, molecular sieve catalyst, chemical instruments and methods, etc., can solve the problems that cannot fully meet the needs of anti-alkali metal poisoning, and the income is not obvious, and achieve anti-alkali metal poisoning The effect of strong ability, good selectivity and wide temperature window

Active Publication Date: 2018-10-02
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

All in all, the traditional method of anti-alkali metal poisoning is generally to increase acid sites and active sites, but the benefits of these measures are not obvious, and cannot fully meet the needs of anti-alkali metal poisoning in the practical application of SCR catalysts

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] The H-SAPO-34 molecular sieve was prepared by hydrothermal method. Dissolve 17.3468g of ammonium chloride in 100ml of deionized water, add 5g of H-SAPO-34 to it, adjust the pH to 3.5 with hydrochloric acid, stir at 80°C for 2h, filter, and dry in an oven at 120°C overnight to obtain NH 4 -SAPO-34. Dissolve 0.6242g of copper sulfate in 100ml of deionized water, add 1g of NH 4 -SAPO-34 was added and ion exchanged at 80°C for 3 hours, filtered, washed, dried overnight at 120°C, and calcined at 550°C for 5 hours to obtain Cu-SAPO-34 molecular sieve. Then, 0.2073 g of potassium carbonate, 0.9584 g of titanium dioxide, and 0.3157 g of manganese trioxide were mixed uniformly and thoroughly ground, and then placed in a muffle furnace and calcined in air at 1000°C for 8 hours. The obtained powder was treated with a mixed acid of sulfuric acid and nitric acid (volume ratio 3:1) at 80°C for 3 hours, filtered and washed to neutrality. Then, the Cu-SAPO-34 obtained above and the aci...

Embodiment 2

[0032] The H-SAPO-34 molecular sieve was prepared by hydrothermal method. Dissolve 25.9581g of ammonium nitrate in 100ml of deionized water, add 5g of H-SAPO-34 to it, adjust the pH to 3.5 with nitric acid, stir at 80°C for 2h, filter, and dry in an oven at 120°C overnight to obtain NH 4 -SAPO-34. Dissolve 0.6242g of copper sulfate in 100ml of deionized water, add 1g of NH 4 -SAPO-34 was added and ion exchanged at 80°C for 3 hours, filtered, washed, dried overnight at 120°C, and calcined at 550°C for 5 hours to obtain Cu-SAPO-34 molecular sieve. Then, 0.2073 g of potassium carbonate, 0.9584 g of titanium dioxide, and 0.3157 g of manganese trioxide were mixed uniformly and thoroughly ground, and then placed in a muffle furnace and calcined in air at 1000°C for 8 hours. The obtained powder was treated with a mixed acid of sulfuric acid and nitric acid (volume ratio 3:1) at 80°C for 3 hours, treated twice, and filtered and washed to neutrality. Then, the Cu-SAPO-34 obtained above...

Embodiment 3

[0035] The H-SAPO-34 molecular sieve was prepared by hydrothermal method. Dissolve 17.3468g of ammonium chloride in 100ml of deionized water, add 5g of H-SAPO-34 to it, adjust the pH to 3.5 with hydrochloric acid, stir at 80°C for 2h, filter, and dry in an oven at 120°C overnight to obtain NH 4 -SAPO-34. Dissolve 0.4689g of copper nitrate in 100ml of deionized water, add 1g of NH 4 -SAPO-34 was added and ion exchanged at 80°C for 4 hours, filtered, washed, dried overnight at 120°C, and calcined at 550°C for 5 hours to obtain Cu-SAPO-34 molecular sieve. Then, 0.2073 g of potassium carbonate, 0.9584 g of titanium dioxide, and 0.3157 g of manganese trioxide were mixed uniformly and thoroughly ground, and then placed in a muffle furnace and calcined in air at 1000°C for 8 hours. The obtained powder was treated with a mixed acid of sulfuric acid and nitric acid (volume ratio 3:1) at 80°C for 3 hours, treated twice, and filtered and washed to neutrality. Then, the Cu-SAPO-34 obtaine...

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Abstract

The invention relates to a denitration catalyst capable of resisting alkali metal poisoning and a preparation method thereof, wherein the catalyst can be used for removal of NOx discharged from stationary sources and moving sources. By means of a new alkali metal ion capture method, the alkali metal ions are immobilized in pores in a hollandite oxide through ion exchange, so that catalytic activity of a molecular sieve is not influenced and capability of resisting alkali metal poisoning is greatly enhanced. In the catalyst, SCR catalytic activity is supplied by the molecular sieve, so that thecatalyst has advantages of high activity, good selectivity and wide temperature window. The alkali metal ions are captured by means of the hollandite oxide, so that the capability of resisting alkalimetal poisoning of the catalyst is effectively improved. The method is environment-friendly, is simple in production process and can be used for large-scale industrial production. The catalyst can beused for removal of NOx discharged from fixed sources and moving sources.

Description

Technical field [0001] The invention relates to a denitrification catalyst resistant to alkali metal poisoning and a preparation method thereof, in particular to a balsamite manganese titanium oxide reinforced Cu-SAPO-34 molecular sieve denitrification catalyst and a preparation method thereof. Background technique [0002] Nitrogen oxide is a common air pollutant. As we all know, nitrogen oxide can cause acid rain, photochemical smog and haze, and it can also cause direct damage to the human respiratory system. At present, various technical means have been used to control and reduce nitrogen oxide emissions, and the selective catalytic reduction (SCR) technology is the most mature of the commonly used nitrogen oxide removal technologies, among which NH 3 The research of catalytic technology as reducing agent is the most common. Since 1986, transition metal ion exchange molecular sieve series catalysts have attracted more and more attention because of their excellent catalytic pe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/85B01J37/30B01D53/86B01D53/56
CPCB01D53/8628B01J29/85B01J37/30B01J2229/18
Inventor 张登松施利毅查凯文李红蕊张剑平
Owner SHANGHAI UNIV
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