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Wide temperature window de-nitration catalyst and preparation method and application thereof

A denitration catalyst and wide temperature technology, applied in the field of flue gas denitrification, can solve the problems of catalyst pore blockage, reduced service life, catalyst poisoning, etc., and achieve the effects of easy operation, long service life and extended service life.

Inactive Publication Date: 2017-12-15
浙江浙能富兴燃料有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The operating temperature range of the catalyst determines that the SCR denitrification reactor must be arranged between the economizer of the boiler and the air preheater. In this way, since the flue gas has not undergone desulfurization and dust removal, the SO in the flue gas 2 Ease with NH 3 react to form NH 4 HSO 4 and (NH 4 ) 2 SO 4 and fly ash, which cause the pores of the catalyst to be clogged
In addition, since the flue gas entering the SCR reactor has not been dedusted, the K contained in the fly ash 2 O, CaO and AS 2 o 3 It is easy to cause poisoning of the catalyst, which will reduce its service life
In addition, for some old power plants, due to the limitation of space and piping, the retrofit cost of constructing the SCR reactor located between the boiler economizer and the air preheater is very high

Method used

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  • Wide temperature window de-nitration catalyst and preparation method and application thereof
  • Wide temperature window de-nitration catalyst and preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0048] A wide temperature window denitrification MnSbOx / CeZrOy catalyst A is calculated according to the molar ratio of the contained metal elements Mn:Sb:Ce:Zr, wherein Mn:Sb:Ce:Zr is 0.5:0.1:1:2.

[0049] The preparation method of the above-mentioned wide temperature window denitration MnSbOx / CeZrOy catalyst A specifically includes the following steps:

[0050] (1) Dissolve 4.342g soluble cerium salt and 8.5864g soluble zirconium salt in 300ml deionized water, use polytetrafluoroethylene stirring paddle at room temperature, control the stirring rate to be 200rpm and stir to dissolve, then add 3mol / L of After adjusting the pH to 10 with ammonia water, stir for 1 h, filter the obtained precipitate, and rinse the obtained filter cake with deionized water until the pH of the eluate is neutral;

[0051] Described soluble cerium salt is Ce(NO 3 ) 3 ·6H 2 O; soluble zirconium salt is Zr(NO 3 ) 4 ·5H 2 O;

[0052] The amount of soluble cerium salt, soluble zirconium salt and ...

Embodiment 2

[0061] A wide temperature window denitrification MnSbOx / CeZrOy catalyst B is calculated according to the molar ratio of the contained metal elements Mn:Sb:Ce:Zr, wherein Mn:Sb:Ce:Zr is 0.5:0.2:1:2.

[0062] The preparation method of the above wide temperature window denitrification MnSbOx / CeZrOy catalyst B specifically includes the following steps:

[0063] (1) Dissolve 4.342g soluble cerium salt and 8.5864g soluble zirconium salt in 300ml deionized water, use polytetrafluoroethylene stirring paddle at room temperature, control the stirring rate to be 200rpm and stir to dissolve, then add 3mol / L of After adjusting the pH to 10 with ammonia water, stir for 1 h, filter the obtained precipitate, and rinse the obtained filter cake with deionized water until the pH of the eluate is neutral;

[0064] Described soluble cerium salt is Ce(NO 3 ) 3 ·6H 2 O; soluble zirconium salt is Zr(NO 3 ) 4 ·5H 2 O;

[0065] The amount of soluble cerium salt, soluble zirconium salt and deioni...

Embodiment 3

[0074] A wide temperature window denitrification MnSbOx / CeZrOy catalyst A is calculated according to the molar ratio of the contained metal elements Mn:Sb:Ce:Zr, wherein Mn:Sb:Ce:Zr is 0.5:0.3:1:2.

[0075] The preparation method of the above wide temperature window denitrification MnSbOx / CeZrOy catalyst C specifically includes the following steps:

[0076] (1) Dissolve 4.342g soluble cerium salt and 8.5864g soluble zirconium salt in 300ml deionized water, use polytetrafluoroethylene stirring paddle at room temperature, control the stirring rate to be 200rpm and stir to dissolve, then add 3mol / L of After adjusting the pH to 10 with ammonia water, stir for 1 h, filter the obtained precipitate, and rinse the obtained filter cake with deionized water until the pH of the eluate is neutral;

[0077] Described soluble cerium salt is Ce(NO 3 ) 3 ·6H 2 O; soluble zirconium salt is Zr(NO 3 ) 4 ·5H 2 O;

[0078] The amount of soluble cerium salt, soluble zirconium salt and deioni...

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Abstract

The invention discloses a wide temperature window de-nitration catalyst and a preparation method and application thereof. In present SCR method de-nitration technology, hole blockage of the catalyst is easily caused due to the fact that smoke is free of desulfuration or dust collection. The wide temperature window de-nitration catalyst disclosed by the invention is MnSbOx / CeZrOy, and consists of two parts which are a carrier and an active ingredient, the carrier is a CeO2 and ZrO2 composite oxide, and the active ingredient is an MnOx and Sb2O5 composite oxide; and the wide temperature window de-nitration catalyst is calculated in terms of molar ratio of metal elements such as Mn, Sb, Ce and Zr, wherein the ratio of Mn, Sb, Ce to Zr is 0.5: (0.1 to 0.3): 1: 2. The preparation method comprises the following steps: taking manganese acetate, antimony acetate, zirconium nitrate and cerous nitrate as precursors, and using a coprecipitation method and an impregnation method to prepare the catalyst. The preparation cost is low, and the catalyst has relatively high de-nitration effect in smoke with the temperature of 150 to 400 DEG C.

Description

technical field [0001] The invention relates to the field of flue gas denitrification, in particular to a wide temperature window denitrification catalyst and its preparation method and application. Background technique [0002] NO X It is one of the important air pollutants emitted by coal-fired thermal power plants and an important cause of acid rain and photochemical smog. Preliminary estimates show that during the "12th Five-Year Plan" period, the NO X Emissions will reach around 12 million tons. Since the type of acid rain in my country has changed from sulfuric acid acid rain to nitric acid and sulfuric acid mixed acid rain, it has caused great harm to the environment and human health. Therefore, NO X The control of air pollutants has become the focus of the work of air pollutant control in the national "Twelfth Five-Year Plan". [0003] Take NH 3 Selective catalytic reduction denitrification technology (SCR technology) as a reducing agent is a method for control...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/34B01D53/90B01D53/56
CPCB01D53/8628B01D53/90B01D2251/2062B01D2258/0283B01J23/002B01J23/34B01J2523/00B01J2523/72B01J2523/53B01J2523/3712B01J2523/48
Inventor 许洪锋华晓宇徐爱民项群扬宋玉彩吴剑波汤敏华裘立春
Owner 浙江浙能富兴燃料有限公司
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