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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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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

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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

Examples

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Example Embodiment

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

[0034] (1) The nitrate manganese, nitrate, and 100% of the fuel (content of the chemical measurement ratio) are dissolved in the appropriate amount of deionized water;

[0035] (2) 100 nm ore type titanium dioxide is added to the resulting mixed solution, and the mixture is stirred with magnetic force 1 h;

[0036] (3) Place the product obtained by step (2) in advance to 300 ° C in the muffle furnace, then continued from the combustion temperature of 300 ° C to 450 ° C, calcined at 450 ° C for 4 h, and finally grind Mn-CE-O x / TiO 2 catalyst.

[0037] Mn-Ce-O obtained 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 For balance, NO concen...

Example Embodiment

[0042] Example 1

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

[0044] (1) Weigh 2.87 g of manganese nitrate (50% aqueous solution), 1.09 g of nitrate and 3.56 g of citric acid dissolved in 7 ml of deionized water, stir mixed;

[0045] (2) Weighing anatase-type titanium dioxide having a 2G particle diameter of 100 nm is added to a mixed solution, and stirred with magnetic force for 1 h;

[0046] (3) Place the product obtained by step (2) in advance to 300 ° C in the muffle furnace, then continued from the combustion temperature of 300 ° C to 450 ° C, fired at 450 ° C for 4 h, and finally Grinding Mn-Ce-O x / TiO 2 The catalyst is recorded as MCT-100CA.

Example Embodiment

[0047] Example 2

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

[0049] (1) Weigh 2.87 g of manganese nitrate (50% aqueous solution), 1.09 g of nitrate and 3.04 g of urea dissolved in 7 ml of deionized water, stir mixed;

[0050] (2) Weighing anatase-type titanium dioxide having a 2G particle diameter of 100 nm is added to a mixed solution, and stirred with magnetic force for 1 h;

[0051] (3) Place the product obtained by step (2) in advance to 300 ° C in the muffle furnace, then continued from the combustion temperature of 300 ° C to 450 ° C, fired at 450 ° C for 4 h, and finally Grinding Mn-Ce-O x / TiO 2 The catalyst is 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
CPCB01J23/34B01J23/002B01J35/0013B01J35/10B01J37/088B01D53/8634B01D53/8628B01J2523/00B01D2257/404B01D2257/406B01J2523/3712B01J2523/47B01J2523/72
Inventor 毛东森叶林倩郭晓明俞俊吴贵升
Owner SHANGHAI APPLIED TECHNOLOGIES COLLEGE
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