Low-temperature denitration catalyst MnOx-CeO2-TiO2-Al2O3, and preparation method and application thereof

A mnox-ceo2-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, catalyst poisoning, etc., and achieve the advantages of easy operation, long service life and extended service life Effect

Inactive Publication Date: 2013-12-11
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 catalyst MnOx-CeO2-TiO2-Al2O3, and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

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

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

[0049] (1) Dissolve 8ml soluble manganese salt, 4.342g soluble cerium salt, 20.107g soluble titanium salt, 18.757g soluble aluminum salt in 300ml deionized water, use polytetrafluoroethylene stirring paddle at room temperature, control the stirring rate to 200rpm Stir to dissolve, then add 3 mol / L ammonia water to the solution to adjust the pH to 10, then stir for 1 h, filter the obtained precipitate, and rinse the obtained filter cake with deionized water until the pH of the eluate is neutral;

[0050] The soluble cerium salt is Ce(NO 3 ) 3 ·6H 2 O;

[0051] The soluble aluminum salt is Al(NO ...

Embodiment 2

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

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

[0061](1) Dissolve 16ml soluble manganese salt, 8.684g soluble cerium 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 and stir Dissolve, then add 3mol / L ammonia water to the solution to adjust the pH to 10, then stir for 1h, filter the precipitate, and rinse the filter cake with deionized water until the pH of the eluate is neutral;

[0062] The soluble cerium salt is Ce (NO 3 ) 3 ·6H 2 O;

[0063] The soluble aluminum salt is Al(NO 3 ) 3 9H 2 O; ...

Embodiment 3

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

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

[0073] (1) Dissolve 24ml soluble manganese salt, 8.684g soluble cerium salt, 20.107g soluble titanium salt, 18.757g soluble aluminum salt in 500ml deionized water, use polytetrafluoroethylene stirring paddle at room temperature, control the stirring rate to 200rpm stirring Dissolve, then add 3mol / L ammonia water to the solution to adjust the pH to 10, then stir for 1h, filter the precipitate, and rinse the filter cake with deionized water until the pH of the eluate is neutral;

[0074] The soluble cerium salt is Ce (NO 3 ) 3 ·6H 2 O;

[0075] The soluble aluminum salt is Al(NO 3 ) 3 9H 2 O;

[007...

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Abstract

The invention discloses a low-temperature denitration catalyst MnOx-CeO2-TiO2-Al2O3, and a preparation method and an application thereof. The low-temperature denitration catalyst MnOx-CeO2-TiO2-Al2O3 is composed of carriers and active components, wherein the carriers are TiO2 and Al2O3 and the active components are MnOx and CeO2. The molar ratio of Ce:Ti:Al:Mn in the low-temperature denitration catalyst MnOx-CeO2-TiO2-Al2O3 is 0.2-0.4:1:1:0.4-1.2. The preparation method is that: the low-temperature denitration catalyst MnOx-CeO2-TiO2-Al2O3 is prepared by taking titanium sulfate, aluminium nitrate, manganous nitrate and cerium nitrate as precursors and employing a coprecipitation method. The preparation cost is low, and the low-temperature denitration catalyst MnOx-CeO2-TiO2-Al2O3 has better denitration effect in a flue gas at a temperature of 150-300 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-CeO 2 -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 ag...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/34B01D53/86B01D53/56
Inventor 潘卫国洪杰南郭瑞堂潘秉超王爱晨
Owner SHANGHAI UNIVERSITY OF ELECTRIC POWER
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