Non-vanadium denitration catalyst, preparation method and applications thereof

A denitration catalyst and catalyst technology, which are applied in chemical instruments and methods, physical/chemical process catalysts, separation methods, etc., can solve the problems of low denitration performance of catalysts, large temperature fluctuation range, and high toxicity of precursors, and achieve widening of the active temperature. window, improve the safety of use, improve the effect of denitration performance

Active Publication Date: 2015-04-01
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the problem with this catalyst is that the active component V 2 o 5 Its precursor is highly toxic and easy to cause environmental pollution; and it is easy to release SO in the flue gas 2 Oxidation to SO 3 ; The flue gas of coal-fired boilers and the exhaust gas of diesel vehicles fluctuate widely in temperature. When the temperature is lower than 300°C, the denitrification performance of the catalyst is low.

Method used

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  • Non-vanadium denitration catalyst, preparation method and applications thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Example 1: 5% WO 3 / Mn 1 Zr 1 o 2 Preparation of composite catalyst

[0017] a) Take 40ml of 0.5mol / L zirconium nitrate solution and 20ml of 1.0mol / L manganese nitrate solution respectively, stir and mix in a water bath at 50°C for 60 minutes to obtain a mixed solution;

[0018] b) Add ammonia water to the mixed solution obtained in step a) under constant stirring until the pH value is 10, transfer the obtained mixed solution to a hydrothermal reaction kettle, perform a hydrothermal reaction at 120° C. for 4 hours, and then lower it to room temperature;

[0019] c) Suction filter the reaction solution obtained in step b), wash, dry at 120°C for 24 hours, and then bake in a muffle furnace at 500°C for 12 hours to obtain a manganese-zirconium composite oxide;

[0020] d) Take 2.94ml of 0.02mol / L ammonium metatungstate solution, stir in a 30°C water bath to obtain a mixed solution; take 1.81g of the powder obtained in c) and add it to the mixed solution, and stir for 2...

Embodiment 2

[0022] Example 2: 8% WO 3 / Mn 1 Zr 1 o 2 Preparation of composite catalyst

[0023] a) Take 40ml of 1.0mol / L zirconium nitrate solution and 20ml of 2.0mol / L manganese nitrate solution respectively, stir and mix in a water bath at 40°C for 90 minutes to obtain a mixed solution;

[0024] b) Add ammonia water to the mixed solution obtained in step a) under constant stirring until the pH value is 10, transfer the obtained mixed solution to a hydrothermal reaction kettle, perform a hydrothermal reaction at 120° C. for 8 hours, and then lower it to room temperature;

[0025] c) Suction filter the reaction solution obtained in step b), wash, dry at 120°C for 24 hours, and then bake in a muffle furnace at 500°C for 12 hours to obtain a manganese-zirconium composite oxide;

[0026] d) Take 4.51ml of 0.04mol / L ammonium metatungstate solution and stir in a 30°C water bath to obtain a mixed solution; take 3.37g of the powder obtained in c) and add it to the mixed solution, and stir fo...

Embodiment 3

[0028] Example 3: 10% WO 3 / Mn 1 Zr 1 o 2 Preparation of composite catalyst

[0029] a) Take 30ml of 1.0mol / L zirconium nitrate solution and 15ml of 2.0mol / L manganese nitrate solution respectively, stir and mix in a water bath at 30°C for 30 minutes to obtain a mixed solution;

[0030] b) adding ammonia water to the mixed solution obtained in step a) under constant stirring until the pH value is 10, transferring the obtained mixed solution to a hydrothermal reaction kettle, performing a hydrothermal reaction at 120° C. for 12 hours, and then cooling down to room temperature;

[0031] c) Suction filter the reaction solution obtained in step b), wash, dry at 120°C for 12 hours, and then bake in a muffle furnace at 500°C for 4 hours to obtain a manganese-zirconium composite oxide;

[0032] d) Take 3.46ml of 0.05mol / L ammonium metatungstate solution, stir in a 30°C water bath to obtain a mixed solution; take 2.53g of the powder obtained in c) and add it to the mixed solution,...

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Abstract

The present invention relates to a non-vanadium denitration catalyst, a preparation method and applications thereof, and belongs to the technical field of environment catalysis and air pollution control. According to the present invention, the catalyst adopts a manganese zirconium composite oxide as a carrier, tungsten trioxide is adopted as an active component, the manganese zirconium composite oxide is prepared by adopting a hydrothermal method, and the tungsten trioxide addition adopts an impregnation method; the catalyst is characterized in that high toxicity vanadium is not adopted as the active component while the purification efficiency on nitrogen oxides achieves 80-100% at a temperature of 200-400 DEG C at an airspeed of 128000 h<-1>; and the non-vanadium denitration catalyst of the present invention is suitable for elimination of NOx in waste gases discharged from thermal power plants, smelters, industrial boilers, diesel vehicles and the like.

Description

technical field [0001] The invention relates to a composite catalyst, its preparation and a method for selectively catalytically reducing nitrogen oxides under oxygen-enriched conditions by using the catalyst. It is suitable for nitrogen oxides (NO x ), belongs to the technical field of environmental catalysis and air pollution control. Background technique [0002] Nitrogen oxides are a major air pollutant, and the acid rain and photochemical smog caused by them have become increasingly prominent global environmental problems. Therefore, how to effectively eliminate NO x It has become a research hotspot in the field of atmospheric environmental protection technology. Ammonia selective catalytic reduction (Selective catalytic reduction, SCR) is considered as NO x One of the most mature and efficient methods of elimination, the core issue is the development of high-performance catalysts. Currently, NH for industrial applications 3 -SCR catalyst, mainly V 2 o 5 -WO 3 ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/34B01D53/90B01D53/94B01D53/56
Inventor 刘志明李媛苏行
Owner BEIJING UNIV OF CHEM TECH
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