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Medium temperature denitration catalyst with carbon-based material loaded with cerium tungsten and preparation method of medium temperature denitration catalyst

The technology of denitration catalyst and carbon-based material is applied in the field of flue gas denitration, selective catalytic reduction denitration catalyst and preparation technology thereof, which can solve the problems of increased cost and unsatisfactory denitration efficiency, and achieves simple and practical preparation technology and good denitration. The effect of activity and good application prospects

Active Publication Date: 2012-06-27
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The SCR device with high ash arrangement is located between the economizer and the air preheater, and the flue gas temperature is mostly 300-400 °C, so V 2 o 5 -WO 3 / TiO 2 and V 2 o 5 -MoO 3 / TiO 2 The catalyst is very suitable; the SCR device arranged at the end is located after the dust removal device and the desulfurization device, and its flue gas temperature is too low. The early SCR devices arranged at the end in Europe and Japan need to reheat the flue gas, and this arrangement will lead to a large cost Increase; the SCR device with low-ash arrangement is located after the dust removal device. This arrangement can effectively alleviate the poisoning of the catalyst by arsenic, alkali metals and alkaline earth metals in the ash, but the temperature of the flue gas will drop compared with that before the dust removal. In most cases The flue gas temperature is not at V 2 o 5 -WO 3 / TiO 2 and V 2 o 5 -MoO 3 / TiO 2 The optimum operating temperature range of the catalyst leads to unsatisfactory denitrification efficiency

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] The molar ratio of catalyst raw materials is carbon nanotube, water, cerous nitrate hexahydrate and ammonium tungstate. Carbon nanotubes were prepared by chemical vapor deposition. First soak carbon nanotubes with 68% concentrated nitric acid, stir in a constant temperature water bath at 80°C for 2 hours, then wash with deionized water until the pH is 6.5, and finally in 80°C drying. Take 2 grams of nitric acid-treated carbon nanotubes, add 0.2 grams of Ce(NO 3 ) 3 ·6H 2 O (dissolved with an appropriate amount of water) and 0.5 g of ammonium tungstate (dissolved with an appropriate amount of saturated oxalic acid solution), stirred evenly, dried at 80°C, and then burned at 350°C for 3 hours under the protection of nitrogen to obtain the finished catalyst.

[0021] Put the prepared catalyst into a fixed-bed quartz tube reactor for activity and selectivity testing, the reaction temperature is 230-420°C, and the space velocity is 100,000h -1 Under certain conditions, t...

Embodiment 2

[0023] The molar ratio of catalyst raw materials is activated carbon, water, cerous nitrate hexahydrate and ammonium tungstate. Activated carbon is coal-based activated carbon, which is first soaked in 68% concentrated nitric acid, stirred in a constant temperature water bath at 80°C for 4 hours, then rinsed with deionized water until the pH is 6, and finally dried at 100°C. Take 2 g of activated carbon treated with nitric acid, add 0.05 g of Ce(NO 3 ) 3 ·6H 2 O (dissolved with an appropriate amount of water) and 0.08 g of ammonium tungstate (dissolved with an appropriate amount of saturated oxalic acid solution), stirred evenly, dried at 80°C, and then burned at 450°C for 3 hours under the protection of nitrogen to obtain the finished catalyst.

[0024] Put the prepared catalyst into a fixed-bed quartz tube reactor for activity and selectivity testing, the reaction temperature is 230-420°C, and the space velocity is 100,000h -1 Under certain conditions, the denitrification...

Embodiment 3

[0026] The molar ratio of catalyst raw materials is activated carbon fiber, water, cerous nitrate hexahydrate and ammonium tungstate. The activated carbon fibers were first soaked with 68% concentrated nitric acid, stirred in a constant temperature water bath at 80°C for 4 hours, then rinsed with deionized water until the pH was 6.5, and finally dried at 80°C. Take 2 grams of activated carbon fiber treated with nitric acid, add 1 gram of Ce(NO 3 ) 3 ·6H 2 O (dissolved with an appropriate amount of water) and 1.2 grams of ammonium tungstate (dissolved with an appropriate amount of saturated oxalic acid solution), stirred evenly, dried at 60°C, and then burned at 550°C for 3 hours under the protection of nitrogen to obtain the finished catalyst.

[0027] Put the prepared catalyst into a fixed-bed quartz tube reactor for activity and selectivity testing, the reaction temperature is 230-420°C, and the space velocity is 100,000h -1Under certain conditions, the denitrification ef...

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PUM

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Abstract

The invention discloses a medium temperature selective catalytic reduction denitration catalyst with favorable activity and selectivity. The catalyst takes a carbon-based material as a carrier, an oxide of cerium as an active material, and tungsten trioxide as a promoter, wherein the carbon-based material is one of activated carbon, activated carbon fiber or a carbon nano tube. The invention alsodiscloses a preparation method of the catalyst, which comprises the following steps: carrying out purification and surface activation on the carbon-based material by concentrated nitric acid, and then loading the active material and the promoter by adopting an immersion method. The catalyst disclosed by the invention has favorable denitration activity and selectivity in the temperature range of 230 DEG C-420 DEG C, is a very good medium temperature denitration catalyst, and has better application prospect.

Description

technical field [0001] The invention relates to the technical field of air pollution control, in particular to a selective catalytic reduction denitrification catalyst and a preparation process thereof, which are suitable for flue gas denitrification with a flue gas temperature of 230-420°C. Background technique [0002] Sulfur dioxide and nitrogen oxides are the main gas pollutants that cause acid rain, and nitrogen oxides can also cause photochemical smog. With the popularization and application of flue gas desulfurization technology, the emission of sulfur dioxide has been effectively controlled, but the emission of nitrogen oxides has not been effectively controlled. In order to meet the needs of sustainable development and environmental protection, my country has vigorously promoted the control and treatment of nitrogen oxides in recent years, and new nitrogen oxide emission standards are also coming soon. [0003] Nitrogen oxides can be divided into mobile sources and...

Claims

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Application Information

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IPC IPC(8): B01J23/30B01D53/86B01D53/56
Inventor 王海强陈雄波吴忠标曹爽高珊
Owner ZHEJIANG UNIV
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