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Low-temperature denitration MnOx-CuO-TiO2-Al2O3 catalyst as well as preparation method and application thereof

A mnox-cuo-tio2-al2o3, low-temperature denitrification technology, applied in the field of low-temperature flue gas denitrification, can solve the problems of catalyst pore blockage, reduced service life, and high transformation costs, and achieve easy operation, long service life, and reduced waste heat loss Effect

Inactive Publication Date: 2014-02-12
SHANGHAI UNIVERSITY OF ELECTRIC POWER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The operating temperature range of the catalyst determines that the SCR denitrification reactor must be arranged between the economizer of the boiler and the air preheater. In this way, since the flue gas has not undergone desulfurization and dust removal, the SO in the flue gas 2 Ease with NH 3 react to form NH 4 HSO 4 and (NH 4 ) 2 SO 4 and fly ash that cause the pore clogging of the catalyst
In addition, since the flue gas entering the SCR reactor has not been dedusted, the K contained in the fly ash 2 O, CaO and AS 2 o 3 It is easy to cause poisoning of the catalyst, which will reduce its service life
In addition, for some old power plants, due to the limitation of space and piping, the retrofit cost of constructing the SCR reactor located between the boiler economizer and the air preheater is very high

Method used

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  • Low-temperature denitration MnOx-CuO-TiO2-Al2O3 catalyst as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] A low-temperature denitrification MnOx-CuO-TiO 2 -Al 2 o 3 Catalyst A is calculated according to the molar ratio of the contained metal elements Mn, Ti, Al and Cu, wherein Cu:Ti:Al:Mn is 0.2:1:1:0.4.

[0048] The above-mentioned low-temperature denitrification MnOx-CuO-TiO 2 -Al 2 o 3 The preparation method of catalyst A specifically comprises the steps:

[0049] (1) Dissolve 8ml of soluble manganese salt, 2.416g of soluble copper salt, 20.107g of soluble titanium salt, and 18.757g of soluble aluminum salt in 300ml of deionized water, and use a polytetrafluoroethylene stirring paddle at room temperature to control the stirring rate to 200rpm to stir and dissolve , then add 3mol / L ammonia water to the solution to adjust the pH to 10, then stir for 1h, carry out static precipitation, filter the resulting precipitate and rinse it with deionized water until the pH of the eluate is neutral;

[0050] Described soluble copper salt is Cu (NO 3 ) 2 ·3H 2 O;

[0051] Th...

Embodiment 2

[0059] A low-temperature denitrification MnOx-CuO-TiO 2 -Al 2 o 3 Catalyst B is calculated according to the molar ratio of the contained metal elements Mn, Ti, Al and Cu, wherein Cu:Ti:Al:Mn is 0.4:1:1:0.8.

[0060] The above-mentioned low-temperature denitrification MnOx-CuO-TiO 2 -Al 2 o 3 The preparation method of catalyst B, the steps are as follows:

[0061] (1) Dissolve 16ml soluble manganese salt, 4.832g soluble copper salt, 20.107g soluble titanium salt, 18.757g soluble aluminum salt in 400ml deionized water, use polytetrafluoroethylene stirring paddle at room temperature, control the stirring rate to 200rpm stirring Dissolve, then add 3 mol / L ammonia water to the solution to adjust the pH to 10, then stir for 1 h, carry out static precipitation, filter the resulting precipitate and rinse with deionized water until the pH of the eluate is neutral;

[0062] Described soluble copper salt is Cu (NO 3 ) 2 ·3H 2 O;

[0063] The soluble aluminum salt is Al(NO 3 ) ...

Embodiment 3

[0071] A low-temperature denitrification MnOx-CuO-TiO 2 -Al 2 o 3 Catalyst C is calculated according to the molar ratio of the contained metal elements Mn, Ti, Al and Cu, wherein Cu:Ti:Al:Mn is 0.4:1:1:1.2.

[0072] The above-mentioned low-temperature denitrification MnOx-CuO-TiO 2 -Al 2 o 3 The preparation method of catalyst C, the steps are as follows:

[0073] (1) Dissolve 24ml of soluble manganese salt, 4.832g of soluble copper salt, 20.107g of soluble titanium salt, and 18.757g of soluble aluminum salt in 500ml of deionized water, and use a polytetrafluoroethylene stirring paddle at room temperature to control the stirring rate to 200rpm to stir and dissolve , then add 3mol / L ammonia water to the solution to adjust the pH to 10, then stir for 1h, carry out static precipitation, filter the resulting precipitate and rinse it with deionized water until the pH of the eluate is neutral;

[0074] Described soluble copper salt is Cu (NO 3 ) 2 ·3H 2 O;

[0075] The solu...

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Abstract

The invention discloses a low-temperature denitration MnOx-CuO-TiO2-Al2O3 catalyst as well as a preparation method and application thereof. The low-temperature denitration MnOx-CuO-TiO2-Al2O3 catalyst is composed of a carrier and an active ingredient, wherein the carrier is TiO2 and Al2O3; the active ingredient is MnOx and CuO; in the low-temperature denitration MnOx-CuO-TiO2-Al2O3 catalyst, in terms of a molar ratio of metal elements Mn, Ti, Al and Cu, Cu: Ti: Al: Mn is (0.2-0.4):1:1:(0.4-1.2). The preparation method of the catalyst comprises the following step of: preparing the MnOx-CuO-TiO2-Al2O3 catalyst by using titanium sulfate, aluminum nitrate, manganese nitrate and copper nitrate as precursors through a coprecipitation method. The low-temperature denitration MnOx-CuO-TiO2-Al2O3 catalyst disclosed by the invention is low in preparation cost, convenient for industrial popularization and has better denitration effect in a flue gas of 150 DEG C-250 DEG C.

Description

technical field [0001] The invention relates to the field of low-temperature flue gas denitrification, in particular to a low-temperature denitrification MnOx-CuO-TiO 2 -Al 2 o 3 Catalyst and its preparation method and application. Background technique [0002] NOx is one of the important air pollutants emitted by coal-fired power plants, and is an important cause of acid rain and photochemical smog. Preliminary estimates show that during the "12th Five-Year Plan" period, the NO X Emissions will reach around 12 million tons. Since the type of acid rain in my country has changed from sulfuric acid acid rain to nitric acid and sulfuric acid mixed acid rain, it has caused great harm to the environment and human health. Therefore, NO X The control of air pollutants has become the focus of the work of air pollutant control in the national "Twelfth Five-Year Plan". [0003] Take NH 3 Selective catalytic reduction denitration technology (SCR technology) as a reducing agent ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/889B01D53/56B01D53/86
Inventor 郭瑞堂洪杰南潘卫国甄文龙于月良
Owner SHANGHAI UNIVERSITY OF ELECTRIC POWER
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