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SCR (Selective Catalytic Reduction) denitration catalyst as well as preparation method and application of SCR denitration catalyst

A technology of denitrification catalyst and titanium dioxide, which is applied in the field of preparation of SCR denitrification catalyst, can solve problems such as the difficulty of applying industrial combustion equipment to flue gas denitrification, and achieve high activity and good selectivity

Active Publication Date: 2017-05-31
DATANG INT CHEM TECH RESINST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Existing commercial SCR catalysts used in flue gas denitrification in the normal load working range of power generation boilers are effective against SO-containing x , water vapor coal-fired flue gas can only work stably at a temperature above 300°C, it is difficult to apply to the denitrification of flue gas from industrial combustion equipment such as industrial boilers and industrial kilns with an exhaust gas temperature of 240-300°C, and power generation boilers in Denitrification of low-temperature flue gas at 240-300°C during start-up, shutdown, and low-load operation

Method used

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  • SCR (Selective Catalytic Reduction) denitration catalyst as well as preparation method and application of SCR denitration catalyst
  • SCR (Selective Catalytic Reduction) denitration catalyst as well as preparation method and application of SCR denitration catalyst
  • SCR (Selective Catalytic Reduction) denitration catalyst as well as preparation method and application of SCR denitration catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] This example is used to illustrate the SCR denitration catalyst provided by the present invention and its preparation method.

[0029] (1) Add ammonium metavanadate, ammonium paratungstate, and ammonium heptamolybdate into 128g of 5% monoethanolamine aqueous solution at a mass ratio of 1:3:3, and stir until completely dissolved at room temperature to obtain solution A;

[0030] (2) Add 90g of titanium dioxide powder into solution A, dip and stir for 2 hours to obtain suspension B;

[0031] (3) Add 2.5g of cerium nitrate hexahydrate to the suspension B, immerse and stir for 1h, then add 0.16g of ammonium sulfate, immerse and stir for 1h to obtain the suspension C;

[0032] (4) Heat the suspension C to 100°C, continue to stir until it becomes a paste, then dry it at 120°C for 5 hours, and grind the dried material into a 250-mesh powder;

[0033] (5) Calcining the powder obtained in step (4) at 500° C. for 5.5 hours to obtain the SCR denitration catalyst of the present in...

Embodiment 2

[0035] This example is used to illustrate the SCR denitration catalyst provided by the present invention and its preparation method.

[0036] (1) Add ammonium metavanadate, ammonium paratungstate, and ammonium heptamolybdate into 128g of 5% monoethanolamine aqueous solution at a mass ratio of 1:4:4, and stir until completely dissolved at room temperature to obtain solution A;

[0037] (2) Add 85g of titanium dioxide powder into solution A, dip and stir for 2 hours to obtain suspension B;

[0038] (3) Add 8 g of cerium nitrate hexahydrate to the suspension B, immerse and stir for 1 h, then add 1 g of antimony acetate, immerse and stir for 1.5 h, then add 1 g of ammonium sulfate, immerse and stir for 1 h to obtain suspension C;

[0039] (4) Heat the suspension C to 100°C, continue to stir until it becomes a paste, then dry it at 120°C for 5 hours, and grind the dried material into a 300-mesh powder;

[0040] (5) Calcining the powder obtained in step (4) at 500° C. for 3 hours t...

Embodiment 3

[0042] This example is used to illustrate the SCR denitration catalyst provided by the present invention and its preparation method.

[0043] (1) Add ammonium metavanadate, ammonium paratungstate, and ammonium heptamolybdate into 128g of 5% monoethanolamine aqueous solution at a mass ratio of 1:5:5, and stir until completely dissolved at room temperature to obtain solution A;

[0044] (2) Add 75g of titanium dioxide powder into solution A, dip and stir for 2 hours to obtain suspension B;

[0045] (3) Add 12g of cerium nitrate hexahydrate to the suspension B, immerse and stir for 1h, then add 1.5g of antimony acetate, immerse and stir for 1.5h, then add 4g of ammonium sulfate, immerse and stir for 1h to obtain suspension C;

[0046] (4) Heat the suspension C to 100°C, continue to stir until it becomes a paste, then dry it at 120°C for 5 hours, and grind the dried material into a 500-mesh powder;

[0047] (5) Calcining the powder obtained in step (4) at 500° C. for 5 hours to o...

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Abstract

The invention provides an SCR (Selective Catalytic Reduction) denitration catalyst as well as a preparation method and application of the SCR denitration catalyst. The SCR denitration catalyst is prepared from 0.8 weight percent to 1.2 weight percent of vanadium pentoxide, 2.5 weight percent to 10 weight percent of tungsten trioxide, 1 weight percent to 20 weight percent of cerium dioxide, 2.5 weight percent to 10 weight percent of molybdenum trioxide, 0.1 weight percent to 5 weight percent of sulfur trioxide, 0 to 2 percent of antimony trioxide and the balance of anatase type titanium dioxide, wherein the denitration rate of the SCR denitration catalyst at the air speed of 30000h<-1> under the temperature range of 240 DEG C to 400 DEG C is more than 94 percent. The SCR denitration catalyst provided by the invention has high activity and good selectivity. The preparation method of the catalyst is the improvement of an existing commercial catalyst preparation process method; amplified industrial production can be carried out by existing equipment.

Description

technical field [0001] The invention belongs to the field of preparation of flue gas purification catalysts, and in particular relates to a preparation method of an SCR denitration catalyst with a wide active temperature window. Background technique [0002] Selective Catalytic Reduction (SCR) is the most widely used method for controlling nitrogen oxide emissions in coal-fired power plants in my country, and the core of the SCR method is the catalyst. [0003] Currently the most commonly used commercial SCR denitration catalyst is V 2 o 5 -WO 3 / TiO 2 Department (vanadium-tungsten-titanium-based depinning catalyst). Existing commercial SCR catalysts used in flue gas denitrification in the normal load working range of power generation boilers are effective against SO-containing x , water vapor coal-fired flue gas can only work stably at a temperature above 300°C, it is difficult to apply to the denitrification of flue gas from industrial combustion equipment such as ind...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/30B01D53/86B01D53/56B01D53/50
CPCB01D53/8609B01D53/8628B01D2258/0283B01J23/002B01J23/30B01J2523/00B01J2523/3712B01J2523/47B01J2523/55B01J2523/69B01J2523/68B01J2523/53
Inventor 李春启王旭金梅长松陈爱平段世慈
Owner DATANG INT CHEM TECH RESINST
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