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Plate-type sulfur-resistant water-resistant low-temperature SCR denitration catalyst and preparation method thereof

A denitrification catalyst and co-catalyst technology, applied in the field of SCR denitrification catalyst preparation, can solve the problems of poor anti-sulfur and water resistance, poor anti-sulfur poisoning ability, low-temperature activity, etc., and achieve low running resistance, high porosity, The effect of improving the performance of sulfur resistance and water resistance

Active Publication Date: 2021-06-25
SHANXI PULI ENVIRONMENT ENG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Except for the thermal power industry, most of the flue gas temperatures in other industries are below 300°C, and the current denitrification catalysts that can achieve ultra-low emissions in power plants cannot meet the requirements of flue gas denitrification in other industries. If you use conventional power plant denitrification catalysts, you must Flue gas heating will cause great energy consumption
However, the existing low-temperature denitrification catalysts have large running resistance, easy clogging, low low-temperature activity, poor anti-sulfur and water resistance, and require periodic online regeneration, etc.
At present, there are many low-temperature catalysts developed, including vanadium-based, cerium-based, manganese-based, etc., but the ability of cerium-based and manganese-based catalysts to resist sulfur poisoning is poor

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Dissolve 0.25 kg of monoethanolamine, 0.82 kg of ammonium metavanadate and 1.9 kg of ammonium heptamolybdate in 9 kg of deionized water at 90° C., dissolve and mix them all to obtain precursor solution A. Dissolve 0.2 kg of cerium nitrate and 0.3 kg of tin tetrachloride in 3 kg of deionized water at 70° C., dissolve all of them and mix well to prepare precursor solution B. Add precursor solution A and precursor solution B to 20kg of titanium dioxide and mix well, then add 0.8kg low-melting point copolymer, 1kg glass fiber, 0.3kg polyethylene oxide after fully stirring, fully stir and mix again, and then put Put the mixed mud into the air-conditioned room to age for 16 hours. Take the above-mentioned mud material that has been aged and extrude and granulate it with a granulator. After granulation, it is rolled and coated on a stainless steel mesh plate, and then cut and pleated. The formed mesh plate is placed in a roasting furnace. Calcined at a constant temperature of...

Embodiment 2

[0034] Dissolve 0.38 kg of monoethanolamine, 0.95 kg of ammonium metavanadate and 2.6 kg of ammonium heptamolybdate in 9.5 kg of deionized water at a temperature of 95° C., dissolve and mix them all to obtain a precursor solution A. Dissolve 0.35 kg of cerium nitrate and 0.4 kg of tin tetrachloride in 3 kg of deionized water at 80° C., dissolve all of them and mix well to prepare precursor solution B. Add precursor solution A and precursor solution B to 20kg titanium dioxide and mix well, then add 1.0kg low melting point copolymer, 1.2kg glass fiber, 0.4kg polyethylene oxide after fully stirring, fully stir and mix again, then Put the mixed mud into the air-conditioned room to age for 36 hours. Take the above-mentioned mud material that has been aged and extrude and granulate it with a granulator. After granulation, it is rolled and coated on a stainless steel mesh plate, and then cut and pleated. The formed mesh plate is placed in a roasting furnace. Calcined at a constant t...

Embodiment 3

[0037]Dissolve 0.4 kg of monoethanolamine, 1.05 kg of ammonium metavanadate and 2.6 kg of ammonium heptamolybdate in 9.5 kg of deionized water at 95° C., dissolve all of them and mix well to prepare precursor solution A. Dissolve 0.35 kg of cerium nitrate and 0.5 kg of tin tetrachloride in 3 kg of deionized water at 80° C., dissolve and mix them all to prepare precursor solution B. Add precursor solution A and precursor solution B to 15kg of titanium dioxide and mix well, then add 0.75kg of low-melting point copolymer, 0.9kg of glass fiber, and 0.45kg of polyethylene oxide after fully stirring, fully stir and mix again, and then Put the mixed mud into the air-conditioned room to age for 24 hours. Take the above-mentioned mud that has been aged and extrude it with a granulator to granulate it. After granulation, it is rolled and coated on a stainless steel screen, and then cut and pleated. The formed screen is placed in a roasting furnace. Constant temperature roasting at 520°...

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Abstract

The invention belongs to the technical field of preparation of SCR denitration catalysts, and particularly relates to a plate-type sulfur-resistant water-resistant low-temperature SCR denitration catalyst and a preparation method thereof. According to the catalyst, anatase type nano titanium dioxide serves as a carrier, vanadium pentoxide is loaded on the surface of the carrier to serve as an active component, molybdenum trioxide or tungsten trioxide serves as a cocatalyst, and modified metal elements such as tin or cerium are added to improve the activity and sulfur and water poisoning resistance of the low-temperature SCR denitration catalyst. The catalyst comprises the components: 75-90% of titanium dioxide, 1.5-8.0% of vanadium pentoxide, 3.0-10.0% of molybdenum trioxide or tungsten trioxide and 0-1.0% of tin oxide or cerium oxide, and is obtained by mixing, dipping, extruding and granulating, coating and forming and roasting by a dipping method. The preparation method has the characteristics that the preparation conditions and process are simple, the raw materials are easy to obtain, industrial production can be realized and the like, the obtained catalyst has relatively high low-temperature denitration activity, the denitration activity can reach 80-99% in a range of 100-420 DEG C, and the catalyst has relatively good water resistance and sulfur resistance.

Description

technical field [0001] The invention belongs to the technical field of preparation of SCR denitration catalysts, and in particular relates to a plate-type anti-sulfur and water-resistant low-temperature SCR denitration catalyst and a preparation method thereof. Background technique [0002] Nitrogen oxides are one of the main pollutants that pollute the atmosphere and one of the main causes of smog. Automobile exhaust, thermal power plants, coking plants, cement plants, steel plants and industrial kilns are the main sources of nitrogen oxide emissions. At present, the treatment of automobile exhaust, thermal power plants and coking plants has been basically completed, and thermal power plants have achieved ultra-low emissions of nitrogen oxides with a concentration of less than 50mg / Nm 3 , the coking plant has achieved a special limit on the concentration of nitrogen oxides discharged below 150mg / Nm 3 , but the concentration of nitrogen oxides in cement plants is lower tha...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/28B01J23/30B01J35/04B01J37/08B01D53/86B01D53/56
CPCB01J37/082B01J23/28B01J23/30B01D53/8628B01J35/56Y02A50/20
Inventor 郝海光黄国宝侯致福秦红伟
Owner SHANXI PULI ENVIRONMENT ENG CO LTD
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