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Low-temperature CeO2-modified MnMoOx/attapulgite SCR denitration catalyst

A denitration catalyst and attapulgite technology, which is applied in the field of CeO2 modified MnMoOx/attapulgite low-temperature SCR denitration catalyst, can solve the problems of enhanced redox capacity, narrow denitration activity range, and high denitration reaction temperature, and achieves excellent sulfur resistance performance, The effect of improving denitrification capacity and enhancing denitrification capacity

Inactive Publication Date: 2019-01-11
CHANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The present invention aims at the poor carrier strength of existing flue gas denitrification catalysts, high denitrification reaction temperature, narrow denitrification activity range and resistance to SO 2 disadvantage of poor performance, providing a CeO 2 Modified MnMoO x / ATP low-temperature SCR denitration catalyst and its preparation method, the invention uses cheap attapulgite clay as a carrier, and supports MnMoO with excellent low-temperature oxidation performance x Composite metal oxides, while combining CeO with unique electron transfer ability and excellent sulfur resistance 2 As a co-catalyst modified on the main catalyst, a composite catalyst with excellent medium and low temperature denitrification activity was prepared, which enhanced the redox ability of the catalyst in the medium and low temperature range, effectively reduced the reaction temperature, and formed a high denitrification performance, wide activity range, and anti-SO 2 Excellent denitrification catalyst

Method used

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  • Low-temperature CeO2-modified MnMoOx/attapulgite SCR denitration catalyst
  • Low-temperature CeO2-modified MnMoOx/attapulgite SCR denitration catalyst
  • Low-temperature CeO2-modified MnMoOx/attapulgite SCR denitration catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] (1) Dissolve 16.3mL of concentrated sulfuric acid in 300mL of distilled water to make a 1mol / L sulfuric acid solution. Then weigh 10g of attapulgite raw material and disperse it in the prepared sulfuric acid solution, ultrasonicate for 1min, transfer the solution to a three-neck flask, stir it mechanically for 4h, wash it to neutral with suction, and dry it in an oven at 110°C for 12h. Grinding and sieving to obtain acidified ATP;

[0016] (2) Weigh 0.3513g of ammonium molybdate tetrahydrate, 1.4255g of 50% manganese nitrate solution, 1.5g of acidified attapulgite in a 500mL beaker, add 300mL of distilled water and transfer it to a 500mL three-necked flask after ultrasonication is completely uniform Add ammonia water dropwise under vigorous stirring conditions to adjust the pH of the solution to 10, then mechanically stir for 24 hours, filter under reduced pressure, wash with distilled water until neutral, dry the filter cake in an oven at 110°C for 12 hours, take it ou...

Embodiment 2

[0020] (1) Dissolve 16.3mL of concentrated sulfuric acid in 300mL of distilled water to make a 1mol / L sulfuric acid solution. Then weigh 10g of attapulgite raw material and disperse it in the prepared sulfuric acid solution, ultrasonicate for 1min, transfer the solution to a three-neck flask, stir it mechanically for 4h, wash it with suction to neutrality, and dry it in an oven at 110°C for 12h. Grinding and sieving to obtain acidified ATP;

[0021] (2) Weigh 0.3513g of ammonium molybdate tetrahydrate, 1.4255g of 50% manganese nitrate solution, 1.5g of acidified attapulgite in a 500mL beaker, add 300mL of distilled water and transfer it to a 500mL three-necked flask after ultrasonication is completely uniform Add ammonia water dropwise under vigorous stirring conditions to adjust the pH of the solution to 10, then mechanically stir for 24 hours, filter under reduced pressure, wash with distilled water until neutral, dry the filter cake in an oven at 110°C for 12 hours, take it...

Embodiment 3

[0024] (1) Dissolve 16.3mL of concentrated sulfuric acid in 300mL of distilled water to make a 1mol / L sulfuric acid solution. Then weigh 10g of attapulgite raw material and disperse it in the prepared sulfuric acid solution, ultrasonicate for 1min, transfer the solution to a three-neck flask, stir it mechanically for 4h, wash it with suction to neutrality, and dry it in an oven at 110°C for 12h. Grinding and sieving to obtain acidified ATP;

[0025] (2) Weigh 0.3513g of ammonium molybdate tetrahydrate, 1.4255g of 50% manganese nitrate solution, 1.5g of acidified attapulgite in a 500mL beaker, add 300mL of distilled water and transfer it to a 500mL three-necked flask after ultrasonication is completely uniform Add ammonia water dropwise under vigorous stirring conditions to adjust the pH of the solution to 10, then mechanically stir for 24 hours, filter under reduced pressure, wash with distilled water until neutral, dry the filter cake in an oven at 110°C for 12 hours, take it...

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Abstract

The invention especially relates to a low-temperature CeO2-modified MnMoOx / attapulgite SCR denitration catalyst (abbreviated as CeO2-MnMoOx / ATP), belonging to the field of flue gas denitration. The invention provides the low-temperature CeO2-modified MnMoOx / attapulgite SCR denitration catalyst and a preparation method thereof directed at the disadvantages of poor strength, high denitration reaction temperature, narrow denitration activity range and poor SO2 resistance of conventional carriers for flue gas denitration catalysts. According to the invention, inexpensive attapulgite clay is used as a carrier to support MnMoOx composite metal oxide with excellent low-temperature oxidation performance; meanwhile, CeO2 with unique electron transfer ability and excellent sulfur resistance is usedas a cocatalyst for modifying a main catalyst so as to prepare the composite catalyst with excellent medium-and-low-temperature denitration activity; so the redox capacity of the catalyst in medium-and-low-temperature ranges is enhanced, reaction temperature is effectively lowered, and the denitration catalyst with high denitration performance, a wide activity range and excellent resistance to SO2is formed.

Description

technical field [0001] The invention belongs to the field of flue gas denitrification, in particular to a CeO 2 Modified MnMoO x / Attapulgite (MnMoO x / ATP) low temperature SCR denitration catalyst. Background technique [0002] NO x It is a common pollutant in the atmospheric environment, the largest proportion of which is NO 2 and NO. As a typical air pollutant, nitrogen oxides (NO x ) mainly come from industrial emissions, fuel combustion, and vehicle exhaust. High concentrations of NO in the atmosphere x Will cause great harm to the environment and human health, such as NO x It will cause strong stimulation to the human respiratory system, form acid rain, photochemical smog, ozone depletion, etc. These hazards have become an increasingly serious global problem. The flue gas SCR denitrification technology in the old power industry has many shortcomings. For the transformation of old power plants, low-temperature SCR technology came into being. Currently removin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/34B01D53/90B01D53/56
CPCB01J23/34B01D53/8628B01D53/90B01D2258/0283B01J23/002B01J2523/00B01J2523/3712B01J2523/68B01J2523/72
Inventor 罗士平唐毅然黄晓艳胡李娜谢爱娟黄璇王璐顾鹏飞金响姚超李霞章左士祥
Owner CHANGZHOU UNIV
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