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SCR denitration catalyst with arsenic poisoning resistance and preparation method thereof

A denitration catalyst and arsenic poisoning technology, applied in chemical instruments and methods, physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, etc. , shortening the service life of the catalyst, etc., to achieve the effects of easy industrial production, large specific surface area, and improved mechanical strength

Active 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

However, for the current mainstream honeycomb denitration catalysts, the addition of molybdenum oxide will reduce the mechanical properties of the catalyst and shorten the service life of the catalyst, and only relying on the addition of molybdenum oxide, the catalyst's ability to resist arsenic poisoning is still weak

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Embodiment 1 describes a flat plate SCR denitrification catalyst with anti-arsenic poisoning performance and its preparation method. The specific steps include:

[0028] (1) Preparation of titanium nanotube carrier

[0029] 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.

[0030] (2) Preparation of catalyst sludge

[0031] Measure 22.8g ammonium metavanadate and 19g monoethanolamine, dissolve in 300mL deionized water to obtain ammonium metavanadate solution; dissolve 86.8g ammonium heptamolybdate in 200mL deionized water to obtain ammonium heptamolybdate solution; g tin protochloride was dissolved ...

Embodiment 2

[0036] Example 2 describes a honeycomb SCR denitrification catalyst with anti-arsenic poisoning performance and its preparation method, the specific steps include:

[0037] (1) Preparation of titanium nanotube carrier

[0038] Weigh 800g of nano-titanium dioxide and add it to 8L of sodium hydroxide solution (10mol / L), stir vigorously for 2h, pour the suspension into a hydrothermal kettle, and react at 120°C for 24h. After the reaction, filter and wash the precipitate with 0.2 mol / L dilute hydrochloric acid until the pH value is 2, and finally put the precipitate in an oven and dry it at 100°C for 24 hours to obtain about 980 g of titanium nanotubes.

[0039] (2) Preparation of catalyst sludge

[0040] Measure 10.1g ammonium metavanadate and 8g monoethanolamine, be dissolved in 188mL deionized water to obtain ammonium metavanadate solution; 86.8g ammonium heptamolybdate is dissolved in 200mL deionized water to obtain ammonium heptamolybdate solution; g tin protochloride was d...

Embodiment 3

[0045] Embodiment 3 describes a flat plate SCR denitrification catalyst with anti-arsenic poisoning performance and its preparation method. The specific steps include:

[0046] (1) Preparation of titanium nanotube carrier

[0047] 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 0.1 mol / L dilute hydrochloric acid until the pH value is 3, and finally put the precipitate in an oven at 105°C for 24 hours to obtain about 1225 g of titanium nanotubes.

[0048] (2) Preparation of catalyst sludge

[0049] Measure 35.0g ammonium metavanadate and 30g monoethanolamine, be dissolved in 300mL deionized water to obtain ammonium metavanadate solution; 111.2g ammonium heptamolybdate is dissolved in 300mL deionized water to obtain ammonium heptamolybdate solution; 27.2 g tin protochloride ...

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Abstract

The invention belongs to the fields of environmental protection technology and denitration catalysis, and specifically relates to an SCR denitration catalyst with arsenic poisoning resistance and a preparation method thereof. The catalyst adopts a titanium nanotube as a carrier, vanadium pentoxide as an active ingredient, molybdenum trioxide as a catalytic prompter and stannic oxide as an arsenicresistant promoter, and the flat plate or honeycomb type SCR denitration catalyst with arsenic poisoning resistance is obtained by adopting roll-in coating or extrusion molding technology. The catalyst is simple in production technology and easy for industrial production, has excellent arsenic poisoning resistance and denitration activity, simultaneously has extremely high mechanical performance,and has unique advantages in severe exhaust gas with high dust and high arsenic.

Description

technical field [0001] The invention belongs to the technical field of environmental protection technology and denitrification catalyst, and in particular relates to an SCR denitration catalyst with anti-arsenic poisoning performance and a preparation method thereof. Background technique [0002] Selective Catalytic Reduction (SCR) flue gas denitrification technology has the advantages of high denitrification efficiency, good selectivity and mature technology, and is currently a technology commonly used in countries all over the world. The SCR denitrification system is generally arranged between the economizer and the air preheater. The flue gas contains a large amount of fly ash, and the fly ash and its K, Na, Ca, As and other elements will poison the catalyst and cause the catalyst activity to decrease. Lead to exhaust NOx emissions not up to standard. [0003] Arsenic (As) is one of the common elements that cause poisoning of SCR denitrification catalysts, and the main f...

Claims

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Application Information

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IPC IPC(8): B01J23/28B01J35/02B01D53/86B01D53/56
CPCB01D53/8628B01J23/002B01J23/28B01D2258/0283B01J35/00B01J35/30
Inventor 陆强胡斌
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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