Catalyst for removing flue gas NOx under low temperature and preparation and application

A low-temperature removal and catalyst technology, which is applied to catalyst carriers, chemical instruments and methods, catalysts for physical/chemical processes, etc., can solve problems such as low-temperature NOx removal activity, high NOx removal catalysts, and harsh preparation conditions that do not involve catalysts. , to achieve the effect of flexible layout, high denitration activity and simple operation

Active Publication Date: 2008-09-10
SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are still some problems with this type of catalyst: one is that the catalyst support anatase TiO 2 It is prone to crystal transformation, which makes the preparation conditions harsh and the cost is high; second, the denitrification operating temperature must be higher than 350°C
However, none of these studies involved H 2 O and SO 2 How does it affect the low-temperature NOx removal activity of the catalyst when it coexists, that is, it has not developed in the H 2 O and SO 2 When coexisting, it has a higher NOx removal catalyst

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] 1.488g viscose-based activated carbon fiber impregnated in 17ml of V 2 o 5 Ammonium metavanadate / oxalic acid aqueous solution with a concentration of 0.0004576g / ml, then placed at room temperature for 3h, dried at 50°C for 5h, and dried at 110°C for 5h, then calcined in an argon atmosphere at 500°C for 8h and in air at 250°C for 4h, That is, V with a mass percentage of 0.5% 2 o 5 / ACF catalyst. The catalyst is loaded into a fixed-bed reactor, the reaction temperature is controlled at 180°C, and the simulated flue gas NO600ppm under normal pressure, NH 3 600ppm, O 2 5%, balance gas N 2 , the reaction space velocity is controlled at 1000h -1 . The NO conversion at steady state was 52%. Add 300ppm of SO at the same time 2 , 2%H 2 After O, the NO conversion continued to stabilize at 83%.

Embodiment 2

[0018] 1.488g viscose-based activated carbon fiber impregnated in 17ml of V 2 o 5 Ammonium metavanadate / oxalic acid aqueous solution with a concentration of 0.004576g / ml, then placed at room temperature for 3h, dried at 50°C for 12h, and dried at 110°C for 6h to obtain 5% V 2 o 5 / ACF catalyst, the catalyst was not calcined at 500°C for 8 hours in an argon atmosphere and 5 hours at 250°C in air, it was directly loaded into a fixed bed reactor, the reaction temperature was controlled at 180°C, and the simulated flue gas under normal pressure was introduced NO600ppm, NH 3 600ppm, O 2 5%, balance gas N 2 , the reaction space velocity is controlled at 2000h -1 . The NO conversion at steady state was 60%. Add 50ppm of SO at the same time 2 , 1.2%H 2 After O, the NO conversion continued to stabilize at 70%.

Embodiment 3

[0020] 1.488g viscose-based activated carbon fiber impregnated in 17ml of V 2 o 5 Ammonium metavanadate / oxalic acid aqueous solution with a concentration of 0.004576g / ml, then placed at room temperature for 3h, dried at 50°C for 8h, and dried at 110°C for 6h, then calcined at 500°C for 5h in an argon atmosphere and 250°C for 5h in air, That is, V with a mass percentage of 5% 2 o 5 / ACF catalyst. The catalyst was loaded into a fixed-bed reactor, the reaction temperature was controlled at 180°C, and the simulated flue gas NO600ppm under normal pressure, NH 3 600ppm, O 2 5%, balance gas N 2 , the total gas flow rate is 400ml / min, and the reaction space velocity is controlled at 2000h -1 , the conversion rate of NO at steady state is 98%, while adding 400ppm SO 2 , 3%H 2 After O, the NO conversion continued to stabilize at 80%.

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PUM

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Abstract

The invention relates to a catalyst used for removing flue gas NOx at low temperature. The weight percentage of each component is: 90.0 to 99.0 percent of active carbon fiber and 0.1 to 10.0 percent of V2O5. The active carbon fiber is dipped into a mixed solution prepared by oxalic acid and ammonium metavanadate which contains V2O5 and has a concentration of 0.000088735 to 0.0088735g/ml, then is stood for 2 to 5h under the room temperature, dried for 2 to 12h under a temperature of 40 to 60 DEG C, dried for 2 to 6h under a temperature of 100 to 120 DEG C, then is calcined for 2 to 8h in an argon atmosphere at 400 to 500 DEG C and is calcined for 2 to 5h in air of 200 to 260 DEG C to obtain the catalyst. The invention is simple to be operated, has excellent poisoning capacities of H2O resistance and SO2 resistance and improves the activity of selectively catalyzing and reducing the NOx.

Description

[0001] Field [0002] The invention belongs to a catalyst for removing flue gas NOx at low temperature and its preparation method and application, specifically in H 2 O and SO 2 When coexisting, the low-temperature selective catalytic reduction catalyst for removing NOx from flue gas, its preparation method and application. Background technique [0003] Coal is the main energy source in my country, and it is estimated that it will still account for more than 50% of primary energy by 2050. At present, coal is mainly used in combustion, and coal consumption accounts for about 80% of the total consumption. However, while coal combustion provides energy for our country, it also produces a large amount of pollutants, such as more than 80% of SO in the atmosphere. 2 , more than 60% NO x Wait. Soot-type air pollution seriously endangers the ecological environment, affects people's health and the sustainable development of the economy, so the control of coal-burning SO 2 and NO ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/22B01J35/10B01J32/00B01D53/56B01D53/86
Inventor 黄张根侯亚芹
Owner SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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