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Sulfur-resistant and water-proof low temperature catalyst in flue gas denitration and preparation method thereof

A catalyst and denitrification technology, applied in chemical instruments and methods, physical/chemical process catalysts, separation methods, etc., can solve the problems of no poisoning performance, poor low temperature activity, etc.

Inactive Publication Date: 2014-10-15
四川清源环境工程有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The composition of these catalysts is simple, some without TiO 2 Some carriers do not add catalyst additives or add a single type of additives, so the low-temperature activity is poor, and it needs to be above 140°C or even 180°C to have good catalytic activity, and it does not show good anti-SO 2 and H 2 Poisoning properties of O

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Weigh a certain amount of iron, manganese and metal cerium, copper, vanadium, chromium acetate or nitrate and carrier nano-titanium dioxide and mix them uniformly in the aqueous solution, wherein the total loading of iron and manganese is 14%, iron, manganese and The variable metal molar ratio is 1.2. Put it in an oven after standing for 3 hours, dry it at 90-140°C, then calcinate it in the air at 850°C, grind and sieve after cooling, and take the part of 0.16mm-0.355mm as catalyst.

[0018] The method for testing the SCR activity of the catalyst is: put the catalyst into a fixed-bed tubular reactor, and heat the reactor to the temperature required for the reaction with an electric furnace. will simulate boiler flue gas and reducing agent NH 3 into the reactor, where the simulated flue gas is N 2 , O 2 , NO / N 2 (in N 2 Diluted NO) mixed. Detect the concentration of NO at the inlet and outlet, and calculate the conversion rate of NO. In the reactor, under the acti...

Embodiment 2

[0025] Weigh a certain amount of iron, manganese and metal cerium, copper, vanadium, chromium acetate or nitrate and carrier nano-titanium dioxide and mix them uniformly in the aqueous solution, wherein the total loading of iron and manganese is 8%, manganese and variable-valence metal The molar ratio is 0.3. Put it in an oven after standing for 3 hours, dry it at 90-140°C, then calcinate it in the air at 750°C, grind and sieve after cooling, and take the 0.16mm-0.355mm target part as the catalyst.

[0026] The method of activity test is the same as embodiment 1, at reaction temperature 150 ℃, C NO =C NH3 =0.4%, C O2 = 2.5%, space velocity = 9000h -1 Under operating conditions, the catalytic reduction efficiency of the catalyst is maintained above 85%.

Embodiment 3

[0028] Weigh a certain amount of iron, manganese and metal cerium, copper, vanadium, chromium acetate or nitrate and carrier nano-titanium dioxide and mix them uniformly in the aqueous solution, wherein the total loading of iron and manganese is 1%, manganese and variable-valence metal The molar ratio is 0.1. Put it in an oven after standing for 3 hours, dry it at a temperature of 90-140°C, then calcinate it in the air at 400°C, grind and sieve after cooling, and take the part with a size of 0.16mm-0.355mm as a catalyst.

[0029] The method of activity test is the same as embodiment 1, at reaction temperature 150 ℃, C NO =C NH3 =0.4%, C O2 = 2.5%, space velocity = 9000h -1 Under operating conditions, the catalytic reduction efficiency of the catalyst is maintained above 80%.

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Abstract

The invention relates to a sulfur-resistant and water-proof low temperature catalyst for selective catalytic reduction (SCR) of nitrogen oxides by NH3 in flue gas denitration and a preparation method thereof. The catalyst adopts oxides of iron and manganese as active components, takes nano-titanium dioxide as the carrier, and employs the oxides of two or over two of the valence changing metal cerium, copper, vanadium and chromium as catalyst assistants. The best activity SCR catalyst prepared by the method can have SCR activity up to 94% under the operation conditions of CNO=CNH3=0.4%, CO2=2.5%, space velocity=9000h<-1> and a reaction temperature of 130DEG C, and activity close to 100% at 150DEG C, and has very good anti-SO2 and H2O poisoning capacity. Uner a reaction temperature of 150DEG C, the individual adding of SO2 almost has no influence to the activity, and after individual adding of 10.2% of H2O, the conversion rate of NO can maintain at about 85% for a long time, even under the circumstance of coexistence of about 1000*10<-6> of SO2 and 3.5% of H2O poisoning components, the activity can maintain at about 83% for a long time. Therefore, the SCR sulfur-resistant and water-proof low temperature catalyst has good industrial application prospects.

Description

technical field [0001] The invention relates to a method for NH in flue gas denitrification 3 Selective Catalytic Reduction (SCR) NO X Anti-sulfur and anti-water low-temperature catalyst and preparation method thereof. Background technique [0002] Nitrogen oxides (NO X ) is one of the main pollutants in the atmosphere. Judging from foreign experience, NH 3 Selective Catalytic Reduction (SCR) as a reducing agent is currently the most effective method for flue gas denitrification. It mainly uses V 2 o 5 / TiO 2 and V 2 o 5 -WO 3 / TiO 2 The catalyst needs to be used above 320°C to avoid catalyst poisoning. Therefore, the denitrification device is generally placed before the air preheater of the boiler system and the electrostatic precipitator to meet the requirements of the operating temperature. The high concentration of soot in the flue gas will affect the efficiency, stability and life of the catalyst for denitrification. [0003] Flue gas denitrification has be...

Claims

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Application Information

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IPC IPC(8): B01J23/889B01D53/86B01D53/56
Inventor 杨超伍斌唐佶可
Owner 四川清源环境工程有限公司
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