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SCR denitration catalyst for resisting alkali metal poisoning and preparation method thereof

A denitrification catalyst, alkali metal technology, applied in chemical instruments and methods, physical/chemical process catalysts, separation methods, etc., can solve the problems of catalyst activity reduction, B acid site strength reduction, catalyst poisoning and deactivation, etc., to achieve easy industrialization Production, improve mechanical strength, increase the effect of service life

Inactive Publication Date: 2018-06-15
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The number of Bronsted acid sites on the surface of the catalyst is significantly reduced, and the strength of B acid sites is significantly reduced
The number and strength of acid sites on the surface of the catalyst determine the NH 3 Therefore, the presence of alkali metals inhibits the NH on the surface of the catalyst 3 The adsorption and activation process, leading to catalyst poisoning and deactivation
In addition, the presence of alkali metals will also affect the valence state of vanadium species and the amount of chemisorbed oxygen in the catalyst, which is not conducive to the electron transfer between species on the catalyst surface, leading to a decline in catalyst activity.
The reduction of catalyst activity not only affects the efficiency of the denitrification tower, but also affects the downstream systems and equipment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Embodiment 1 describes a flat-plate SCR denitration catalyst with anti-alkali metal poisoning performance and its preparation method. The specific steps include:

[0030] (1) Preparation of titanium nanotube carrier

[0031] Weigh 1000g of nano-titanium dioxide and add it to 10L of sodium hydroxide solution (10mol / L), stir vigorously for 4h, pour the suspension into a hydrothermal kettle, and react at 150°C for 24h. After the reaction, filter and wash the precipitate with 0.1 mol / L dilute hydrochloric acid until the pH value is 4, and finally put the precipitate in an oven at 105° C. for 24 hours to obtain about 1225 g of titanium nanotubes.

[0032] (2) Preparation of catalyst sludge

[0033] Measure 18.9g ammonium metavanadate and 12g monoethanolamine, dissolve in 300mL deionized water to obtain ammonium metavanadate solution; measure 58.9g ammonium metatungstate and dissolve in 200mL deionized water to obtain ammonium metatungstate solution; measure Dissolve 39.1g ...

Embodiment 2

[0038] Embodiment 2 describes a flat SCR denitration catalyst with anti-alkali metal poisoning performance and its preparation method, the specific steps include:

[0039] (1) Preparation of titanium nanotube carrier

[0040] Weigh 1000g of nano-titanium dioxide and add it to 10L of potassium hydroxide solution (10mol / L), stir vigorously for 4h, pour the suspension into a hydrothermal kettle, and react at 150°C for 24h. After the reaction, filter and wash the precipitate with 0.1 mol / L dilute hydrochloric acid until the pH value is 4, and finally put the precipitate in an oven at 105° C. for 24 hours to obtain about 1225 g of titanium nanotubes.

[0041] (2) Preparation of catalyst sludge

[0042]Measure 20.4g ammonium metavanadate and 12g monoethanolamine, dissolve in 300mL deionized water to obtain ammonium metavanadate solution; measure 73.8g ammonium metatungstate and dissolve in 200mL deionized water to obtain ammonium metatungstate solution; measure Dissolve 51.1g of c...

Embodiment 3

[0047] Embodiment 3 describes a honeycomb SCR denitration catalyst with anti-alkali metal poisoning performance and its preparation method, the specific steps include:

[0048] (1) Preparation of titanium nanotube carrier

[0049] Weigh 1000g of nano-titanium dioxide and add it into 10L potassium hydroxide solution (10mol / L), stir vigorously for 6h, pour the suspension into a hydrothermal kettle, and react at 140°C for 24h. After the reaction, filter and wash the precipitate with 0.2 mol / L dilute hydrochloric acid until the pH value is 3, and finally put the precipitate in an oven at 95° C. for 24 hours to obtain about 1225 g of titanium nanotubes.

[0050] (2) Preparation of catalyst sludge

[0051] Measure 42.5g ammonium metavanadate and 30g monoethanolamine, dissolve in 250mL deionized water to obtain ammonium metavanadate solution; measure 119.6g ammonium metatungstate and dissolve in 150mL deionized water to obtain ammonium metatungstate solution; measure Dissolve 66.2g...

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Abstract

The invention belongs to the field of environmental protection technology and denitration catalysis, and particularly relates to an SCR denitration catalyst for resisting alkali metal poisoning and apreparation method thereof. The catalyst carrier provided by the invention is a titanium nano-tube, the active ingredient is vanadium pentoxide, and the catalytic assistants are tungsten trioxide, antimony trioxide and copper sulfate. A flat-plate type or honeycomb type SCR denitration catalyst with alkali metal poisoning resistance is prepared by adopting a rolling coating or extrusion molding process. The catalyst provided by the invention has the advantages of simple production process, easy implementation of industrial production, and very good alkali metal poisoning resistance and mechanical performance, can solve the problem of alkali metal poisoning of the denitration catalyst, and is suitable for flue gas with high alkali metal content.

Description

technical field [0001] The invention belongs to the technical field of environmental protection technology and denitrification catalyst, and in particular relates to an anti-alkali metal poisoning SCR denitrification catalyst and a preparation method thereof. Background technique [0002] Ammonia Selective Catalytic Reduction (SCR) denitrification technology is currently the flue gas denitrification technology with the highest denitrification efficiency, the most mature technology and the most widely used. However, the dust in the flue gas contains a large amount of alkali metals, alkaline earth metals and heavy metals, etc., which will be enriched on the surface of the catalyst, block the catalyst pores and inhibit the catalyst activity, resulting in a decrease in catalyst activity and excessive nitrogen oxides in the exhaust gas. . [0003] After the alkali metal in the flue gas is adsorbed on the surface of the catalyst, it reacts with the V-OH species on the surface to ...

Claims

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Application Information

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IPC IPC(8): B01J27/057B01D53/86B01D53/56
CPCB01D53/8628B01J27/0576B01J35/56
Inventor 陆强胡斌
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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