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Anti-alkali metal poisoning denitrification catalyst and preparation method thereof

A denitration catalyst, alkali metal technology, applied in catalyst activation/preparation, molecular sieve catalysts, chemical instruments and methods, etc., can solve the problems of insignificant benefits, can not fully meet the needs of anti-alkali metal poisoning, etc., achieve good selectivity, The effect of strong resistance to alkali metal poisoning and wide temperature window

Active Publication Date: 2021-12-03
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 into it, adjust the pH value 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 Add -SAPO-34 into it, ion exchange at 80°C for 3h, filter, wash, dry overnight at 120°C, and calcined at 550°C for 5h to obtain Cu-SAPO-34 molecular sieve. Then 0.2073g of potassium carbonate, 0.9584g of titanium dioxide, and 0.3157g of manganese trioxide were mixed uniformly and fully ground, and placed in a muffle furnace for calcination in air at 1000°C for 8h. Treat the obtained powder with a mixed acid of sulfuric acid and nitric acid (volume ratio 3:1) at 80°C for 3 hours, filter and wash until neutral. Then mix the Cu-SAPO-34 obtained above with the spessartite oxide after acid tre...

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 into it, adjust the pH value 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 to it for ion exchange at 80°C for 3h, filtered, washed, dried overnight at 120°C, and calcined at 550°C for 5h to obtain Cu-SAPO-34 molecular sieve. Then 0.2073g of potassium carbonate, 0.9584g of titanium dioxide, and 0.3157g of manganese trioxide were mixed uniformly and fully ground, and placed in a muffle furnace for calcination in air at 1000°C for 8h. Treat the obtained powder with a mixed acid of sulfuric acid and nitric acid (volume ratio 3:1) at 80°C for 3 hours, process twice, filter and wash until neutral. Then, the Cu-SAPO-34 obtained above and the spessartite oxi...

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 into it, adjust the pH value 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, 1g of NH 4 Add -SAPO-34 into it, ion exchange at 80°C for 4h, filter, wash, dry overnight at 120°C, and calcined at 550°C for 5h to obtain Cu-SAPO-34 molecular sieve. Then 0.2073g of potassium carbonate, 0.9584g of titanium dioxide, and 0.3157g of manganese trioxide were mixed uniformly and fully ground, and placed in a muffle furnace for calcination in air at 1000°C for 8h. Treat the obtained powder with a mixed acid of sulfuric acid and nitric acid (volume ratio 3:1) at 80°C for 3 hours, process twice, filter and wash until neutral. Then mix the Cu-SAPO-34 obtained above with the spessartite oxide aft...

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PUM

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Abstract

The invention relates to a denitrification catalyst resistant to alkali metal poisoning and a preparation method thereof. The catalyst can be used for removal of nitrogen oxides discharged from stationary sources and mobile sources. The gist of the present invention is: using a new type of alkali metal ion capture method, the alkali metal ions are fixed in the pores of the spessenbergite oxide through the ion exchange mechanism, so that the catalytic activity of the molecular sieve will not be affected, and the ability to resist alkali metal poisoning is greatly improved improve. The catalyst uses molecular sieves to provide SCR catalytic activity, and has the advantages of high activity, good selectivity, and wide temperature window. The use of spessartite oxides to trap alkali metal ions effectively improves the ability of the catalyst to resist alkali metal poisoning. The method has the advantages of environmental friendliness, simple production process, suitable for large-scale industrial production, etc., and can be used for removal of nitrogen oxides discharged from stationary sources and mobile 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 spessenite manganese titanium oxide enhanced Cu-SAPO-34 molecular sieve denitration catalyst and a preparation method thereof. Background technique [0002] Nitrogen oxides are a common air pollutant. As we all know, nitrogen oxides can cause acid rain, photochemical smog and smog, and 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 selective catalytic reduction (SCR) technology is the most mature among the commonly used nitrogen oxide removal technologies, among which NH 3 The research on catalytic technology of reducing agent is the most common. Since 1986, transition metal ion-exchanged molecular sieve series catalysts have attracted more and more attention because of their excellent catalytic perfo...

Claims

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Application Information

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Patent Type & Authority Patents(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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