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Low-temperature SCR catalyst using nitrogen-dopped activated carbon as carrier and preparation technique thereof

A technology of SCR catalyst and activated carbon, applied in the field of low-temperature SCR catalyst, can solve the problem of less nitrogen-containing functional groups on the surface, and achieve the effects of large specific surface area, improved reaction rate and NO removal efficiency, and simple treatment method.

Inactive Publication Date: 2009-01-28
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Most of the relevant studies have reported the effects of pore structure, surface oxygen-containing functional groups and metal catalysts on the low-temperature SCR reaction, but there are few reports on the influence of surface nitrogen-containing functional groups on the removal of NO by low-temperature SCR.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Ultrasonic-assisted equal-volume impregnation method is used, with activated carbon and manganese nitrate as raw materials, and the mass percentages of each component are as follows: 99% activated carbon, 1% manganese nitrate, ultrasonic treatment for 2h, and then stand at room temperature for 24h, and then put it in an oven for 110 °C for 6 h, and finally baked at 300 °C for 2 h in an Ar atmosphere and cooled to room temperature; then at 300 °C in NH 3 1% NH by volume 3 + Ignition in Ar atmosphere for 1h; cooling in Ar atmosphere to obtain the catalyst, the nitrogen doping concentration of the catalyst is about 0.1%.

[0020] The flue gas containing nitrogen oxides is treated by using the above-mentioned catalyst, the NO concentration in the intake air is 500ppm, the ammonia gas and the nitrogen oxides in the flue gas are fully mixed according to the molar ratio of 1:1, and then enter the reactor. The test results of the exhausted flue gas show that the removal effici...

Embodiment 2

[0022] Ultrasonic-assisted equal-volume impregnation method is used, with activated carbon and vanadium sulfate as raw materials, and the mass percentages of each component are as follows: 95% activated carbon, 5% vanadium sulfate, ultrasonic treatment for 2h, and then stand at room temperature for 24h, and then put it in an oven for 110 °C for 6 h, and finally baked at 400 °C for 2 h in an Ar atmosphere; then at 400 °C in NH 3 Volume fraction is 5% NH 3 + Ignition in Ar atmosphere for 1h; cooling in Ar atmosphere to obtain the catalyst, the nitrogen doping concentration of the catalyst is about 0.3%.

[0023] The NO concentration in the intake air is 200ppm, and the ammonia gas and the nitrogen oxides in the flue gas are fully mixed according to the molar ratio of 1:1 and then enter the reactor. The test results of the exhausted flue gas show that the removal efficiency of nitrogen oxides can reach more than 80% at 150°C, and the overflow concentration of ammonia gas is less...

Embodiment 3

[0025] Ultrasonic-assisted equal-volume impregnation method, with activated carbon and ferric chloride as raw materials, the mass percentage of each component is as follows: activated carbon 90%, ferric chloride 10%, ultrasonic treatment for 2 hours, then stand at room temperature for 24 hours, and then put it in an oven Dry at 110°C for 6h, and finally bake at 500°C in Ar atmosphere for 2h and cool to room temperature; then at 500°C in NH 3 Volume fraction is 20% NH 3 + Burning in Ar atmosphere for 1h; cooling in Ar atmosphere to obtain the catalyst, the nitrogen doping concentration of the catalyst is about 2.0%.

[0026] The NO concentration in the intake air is 500ppm, and the ammonia gas and the nitrogen oxides in the flue gas are fully mixed according to the molar ratio of 1:1 before entering the reactor. The test results of the exhausted flue gas show that the removal efficiency of nitrogen oxides can reach more than 65% at 150°C, and the overflow concentration of ammo...

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Abstract

The invention discloses a low-temperature SCR catalyst which takes nitrogen mingled with active carbon as a carrier. The catalyst takes the nitrogen mingled with active carbon prepared by ammonia gas ignition as the carrier and one of the oxides loaded with metallic element of Mn, V, Fe, Co or Cu as an active ingredient. The invention also discloses a specific method for preparing the catalyst. The carrier of nitrogen mingled with active carbon increases the number of base sites on the surface of the active carbon, so as to improve the adsorptive capacity of NO and O2 and lead more NO to be oxidized into NO2. The load of the metal metallic oxides of Mn, V, Fe, Co and Cu forms a large amount of acid sites on the surface of the catalyst, which promotes the absorption capability of the catalyst to NH3. The measures effectively enhances the denitration activity of the low-temperature SCR catalyst which takes the nitrogen mingled with active carbon as the carrier and extends the activity temperature window of the reaction thereof.

Description

technical field [0001] The invention relates to the field of air pollution control, in particular to a low-temperature SCR catalyst with nitrogen-doped activated carbon as a carrier, and a preparation method thereof. Background technique [0002] The flue gas emitted by coal-fired boilers contains SO 2 , NO X and dust and other harmful components, among which nitrogen oxides (NO X ) is one of the key pollutants to be controlled, which can cause air pollution such as acid rain and photochemical smog, and has become an important issue that cannot be ignored. Take NH 3 Selective Catalytic Reduction (SCR) as a reducing agent is currently the most researched, most widely used, and most effective flue gas NO X removal technique. NH 3 , NO and O 2 Under the action of a catalyst, a reduction reaction occurs to generate N 2 and H 2 O. [0003] The most mature SCR catalyst currently used is V 2 o 5 / TiO 2 or at V 2 o 5 / TiO 2 Based on the modified catalyst, its main ad...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/34B01J23/22B01J23/74B01J23/72B01J21/18B01D53/56
Inventor 刘越吴忠标王海强顾婷婷陈雄波
Owner ZHEJIANG UNIV
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