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Low-temperature denitration catalyst and preparation method and application thereof

A low-temperature denitration and catalyst technology, which is applied in catalyst activation/preparation, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problems of narrow activity temperature window, increased operating cost, and high reaction temperature, and achieve a wide reaction temperature window. , The effect of simple equipment and low cost of raw materials

Pending Publication Date: 2021-03-12
SHANGHAI APPLIED TECHNOLOGIES COLLEGE
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the commercial catalyst commonly used in SCR technology is vanadium-based [VO 5 -WO 3 (MoO 3 ) / TiO 2 ] catalyst, which has the advantages of good catalytic activity, good water resistance and sulfur resistance, but has the disadvantages of high reaction temperature, narrow activation temperature window (300-400°C), high denitrification cost, and harmful to the environment
Usually the SCR reaction device is placed after the dust removal and desulfurization device, but at this time the flue gas temperature is generally lower than 300°C. In order to achieve the best denitrification effect of the vanadium-based catalyst, the flue gas is reheated to 300-400°C, greatly increased operating costs

Method used

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  • Low-temperature denitration catalyst and preparation method and application thereof
  • Low-temperature denitration catalyst and preparation method and application thereof
  • Low-temperature denitration catalyst and preparation method and application thereof

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preparation example Construction

[0033] A Mn-Ce-O x / TiO 2 The preparation method of catalyst, wherein the mol ratio between Mn, Ce and Ti is 0.4:0.1:1, the preparation method of this catalyst comprises the following steps:

[0034] (1) manganese nitrate, cerium nitrate and fuel (content is 100% of the stoichiometric ratio) are dissolved in an appropriate amount of deionized water;

[0035] (2) Add 100nm anatase-type titanium dioxide to the obtained mixed solution, and stir with magnetic force for 1 h;

[0036] (3) Place the product obtained in step (2) in a muffle furnace preheated to 300°C and burn rapidly for 1-2 minutes, then continue to heat up from 300°C to 450°C, roast at 450°C for 4 hours, and finally grind Prepared Mn-Ce-O x / TiO 2 catalyst.

[0037] The resulting Mn-Ce-O x / TiO 2 Catalyst preparation method for NH 3 -SCR reaction, wherein the process conditions of the reaction include:

[0038] (1) The catalytic reaction temperature is 50-250°C;

[0039] (2)N 2 As the balance gas, the con...

Embodiment 1

[0043] A Mn-Ce-O x / TiO 2 The preparation method of catalyst, its specific operation steps are as follows:

[0044] (1) Dissolve 2.87g of manganese nitrate (50% aqueous solution), 1.09g of cerium nitrate and 3.56g of citric acid into 7mL of deionized water, stir and mix evenly;

[0045] (2) Weigh 2g of anatase titanium dioxide with a particle size of 100nm and add it to the mixed solution, and stir it with a magnetic force for 1h;

[0046] (3) Place the product obtained in step (2) in a muffle furnace preheated to 300°C and burn rapidly for 1-2 minutes, then continue to heat up from the combustion temperature of 300°C to 450°C, roast at 450°C for 4 hours, and finally Grinding to produce Mn-Ce-O x / TiO 2 Catalyst, recorded as MCT-100CA.

Embodiment 2

[0048] A Mn-Ce-O x / TiO 2 The preparation method of catalyst, its specific operation steps are as follows:

[0049] (1) Weigh 2.87g of manganese nitrate (50% aqueous solution), 1.09g of cerium nitrate and 3.04g of urea and dissolve them in 7mL of deionized water, stir and mix evenly;

[0050] (2) Weigh 2g of anatase titanium dioxide with a particle size of 100nm and add it to the mixed solution, and stir it with a magnetic force for 1h;

[0051] (3) Place the product obtained in step (2) in a muffle furnace preheated to 300°C and burn rapidly for 1-2 minutes, then continue to heat up from the combustion temperature of 300°C to 450°C, roast at 450°C for 4 hours, and finally Grinding to produce Mn-Ce-O x / TiO 2 Catalyst, recorded as MCT-100U.

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Abstract

The invention relates to a low-temperature denitration catalyst and a preparation method and application thereof, and the method comprises the following steps: (1) dissolving manganese nitrate, ceriumnitrate and fuel in deionized water to obtain a mixed solution; (2) adding titanium dioxide into the mixed solution, and uniformly stirring to obtain a product; and (3) placing the obtained product in a pre-preheated combustion chamber for rapid combustion, then continuously roasting for a certain time, and finally grinding to obtain the Mn-Ce-Ox / TiO2 low-temperature denitration catalyst which isused for NH3-SCR reaction. Compared with the prior art, the preparation method has the advantages that the operation is simple, the prepared catalyst is porous and fluffy, the low-temperature denitration activity is better, the reaction temperature window is wider, the water resistance and sulfur resistance are better, and the like.

Description

technical field [0001] The invention relates to the technical field of chemical catalysts, in particular to a low-temperature denitrification catalyst and its preparation method and application. Background technique [0002] With the rapid development of the economy, the combustion of a large amount of fossil fuels and the emission of automobile exhaust have produced a lot of dust, sulfur dioxide (SO 2 ), nitrogen oxides (NO x ) and other air pollutants. NO x It is one of the main air pollutants and an important cause of air pollution phenomena such as acid rain, photochemical smog, and haze, and has become the focus of air pollution control. Due to the low NO reduction rate of selective non-catalytic reduction technology (SNCR), it cannot reach the current NO x emission standards, so NH 3 Selective Catalytic Reduction (SCR) as a reducing agent has become the most widely used denitrification technology at present, and its denitrification efficiency is as high as 90%. ...

Claims

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Application Information

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IPC IPC(8): B01J23/34B01J35/10B01J37/08B01D53/56B01D53/58B01D53/86
CPCB01J23/34B01J23/002B01J37/088B01D53/8634B01D53/8628B01J2523/00B01D2257/404B01D2257/406B01J35/23B01J35/60B01J2523/3712B01J2523/47B01J2523/72
Inventor 毛东森叶林倩郭晓明俞俊吴贵升
Owner SHANGHAI APPLIED TECHNOLOGIES COLLEGE
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