High-activity vanadium-free denitration catalyst, preparation method and application thereof

A denitrification catalyst and high activity technology, which is applied in the field of flue gas purification, can solve the problems of limiting the practical application range of the catalyst, the specific surface area cannot exceed, and the denitrification performance of the catalyst has not been investigated, so as to solve biological toxicity, increase the specific surface area, and improve denitrification efficiency effect

Pending Publication Date: 2022-01-28
FUDAN UNIV +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The Chinese invention patent with the publication number CN103894184A discloses a vanadium-zinc modified denitration catalyst with a high specific surface area, which utilizes metatitanic acid and H 2 o 2 The chemical process of complexation and redispersion between ions increases the specific surface area of ​​the catalyst, which effectively improves the denitrification efficiency of the catalyst, but the specific surface area still cannot exceed 100m 2 / g, and still the highly toxic substance V 2 o 5 as active ingredient
The patent document with the publication number CN103406127A discloses a catalyst for non-toxic low-temperature denitrification catalysis. The catalyst uses manganese oxide as the main catalyst and has a denitrification efficiency of more than 80% at 120-250°C. The denitrification performance of sulfur, water and thermal power plant flue gas temperature range (300~400°C) limits the practical application range of this catalyst

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] 1. Preparation of silica-modified titania support:

[0020] Dissolve 0.075mol of titanyl sulfate and 16g of acidic silica sol (25%) in 100ml of deionized water, stir and disperse evenly to form a mixed solution; add ammonia water (25%) to the above mixed solution under continuous stirring, and adjust the pH of the mixed solution to 9 After aging for 10 hours, the above mixture was filtered with suction, and the filtered product was washed until the filtrate pH=7; the filtered product was dried at 80°C for 12 hours, and then calcined at 550°C for 3 hours to obtain a silica-modified titanium dioxide carrier.

[0021] 2. Impregnation load of active ingredients and additives:

[0022] Dissolve 0.025mol of ferrous sulfate heptahydrate, 0.003mol of cerium nitrate hexahydrate and 0.0017mol of niobium oxalate in 100ml of deionized water, fully stir and disperse to form a mixed solution; add 10g of silicon dioxide modified titanium dioxide carrier to the above mixed solution, 80...

Embodiment 2

[0028]1. Preparation of silica-modified titania support:

[0029] Dissolve 0.01mol of titanium tetrachloride and 8g of acidic silica sol (25%) in 100ml of deionized water, stir and disperse evenly to form a mixed solution; add ammonia water (20%) to the above mixed solution under continuous stirring, and adjust the pH of the mixed solution = 8. After aging for 3 hours, filter the mixture with suction, wash and filter the product until the pH of the filtrate is 7; dry the filter product at 100°C for 8 hours, and then calcinate at 500°C for 3 hours to obtain a silica-modified titania carrier.

[0030] 2. Impregnation load of active ingredients and additives:

[0031] Dissolve 0.01mol ferric chloride hexahydrate, 0.01mol cerium nitrate hexahydrate and 0.0006mol ammonium metatungstate in 100ml deionized water, stir and disperse fully to form a mixed solution; add 10g of silica-modified titanium dioxide carrier to the above mixed solution , stirred and evaporated to dryness at 90°...

Embodiment 3

[0037] 1. Preparation of silica-modified titania support:

[0038] Dissolve 0.087mol tetrabutyl titanate and 12g acidic silica sol (25%) in 100ml deionized water, stir and disperse evenly to form a mixed solution; add ammonia water (18%) to the above mixed solution under continuous stirring to adjust the pH of the mixed solution =10; after aging for 2 hours, the above mixed solution was suction-filtered, and the filtered product was washed until the filtrate pH=7; the filtered product was dried at 110°C for 6 hours, and then calcined at 600°C for 3 hours to obtain a silica-modified titania carrier.

[0039] 2. Impregnation load of active ingredients and additives:

[0040] Dissolve 0.02mol ferric nitrate nonahydrate, 0.012mol cerium chloride hexahydrate and 0.001mol ammonium heptamolybdate in 100ml deionized water, stir and disperse fully to form a mixed solution; add 10g of silica-modified titanium dioxide carrier to the above mixed solution , stirred and evaporated to dryne...

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Abstract

The invention belongs to the technical field of flue gas purification, and particularly relates to a high-activity vanadium-free denitration catalyst, a preparation method and application thereof. According to the denitration catalyst, silicon dioxide modified titanium dioxide is used as a carrier, one or more of ferric oxide and cerium oxide are used as active components, and one or more of tungsten trioxide, molybdenum trioxide and niobium pentoxide are used as auxiliary agents. According to the invention, the specific surface area of the catalyst is effectively increased, and the denitration efficiency is remarkably improved; the problem that a traditional vanadium denitration catalyst has biotoxicity is solved; and the denitration catalyst has the specific surface area of 100-150 m<2>/g, can tolerate nitrogen oxide flue gas containing 0-3000 mg/m<3> of SO2 and 0-20% of water vapor, has the denitration efficiency stabilized at 90% or more and the N2 selectivity higher than 92% under the conditions of 280-450 DEG C and the air speed of 3000-100000 h<-1>, has strong water resistance and sulfur resistance, and is particularly suitable for nitrogen oxide emission control of flue gas of a thermal power station.

Description

technical field [0001] The invention belongs to the technical field of flue gas purification, and in particular relates to a vanadium-free denitrification catalyst with a large specific surface area and a preparation method and application thereof. Background technique [0002] Nitrogen oxides (NO x ) are mainly composed of nitric oxide (NO) and nitrogen dioxide (NO 2 ), which is highly irritating to human eyes and respiratory tract. Long-term inhalation of nitrogen oxides by the human body may cause changes in the structure of the lungs and seriously endanger human health. In addition, nitrogen oxides can also cause environmental pollution and destruction such as acid rain and the hole in the ozone layer, which will have a serious impact on social and economic development, ecological balance and people's life and production. In recent years, due to the state's regulations and policies on nitrogen oxide emission reduction and strict implementation of nitrogen oxide emissi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J21/08B01J23/30B01J23/847B01J23/887B01J23/888B01J37/02B01D53/86B01D53/56
CPCB01J21/08B01J23/8474B01J23/888B01J23/8871B01J23/30B01J37/0207B01D53/8628
Inventor 唐幸福刘道清许东润李咸伟胡子国俞勇梅周茂军朱怀宇汪庆丰姜晓军
Owner FUDAN UNIV
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