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Low-temperature SCR denitration catalyst based on kaoline and preparation method of catalyst

A denitration catalyst and kaolin technology, applied in the field of denitration catalysts, can solve the problems of high cost of titanium dioxide, cumbersome co-precipitation process, increase catalyst preparation cost, etc., and achieve the effects of good application prospect, strong denitration ability and wide active temperature window.

Inactive Publication Date: 2019-10-11
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The obtained catalyst has a certain denitrification effect in the experimental temperature range, but due to the cumbersome process of the co-precipitation method and the relatively expensive cost of titanium dioxide, the cost of catalyst preparation has been increased.

Method used

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  • Low-temperature SCR denitration catalyst based on kaoline and preparation method of catalyst
  • Low-temperature SCR denitration catalyst based on kaoline and preparation method of catalyst

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0028] Such as figure 1 Shown, a kind of preparation method of above-mentioned low-temperature SCR denitration catalyst, this method comprises the following steps:

[0029] (a) select manganese nitrate and cerium nitrate as raw materials, mix the two and dissolve them in deionized water to obtain an impregnation solution;

[0030] (b) adding a certain quality of kaolin to the impregnation solution, stirring at room temperature to obtain a suspension;

[0031] (c) Magnetically stirring the suspension until it becomes viscous to obtain a mixture, which is dried and calcined to obtain the desired catalyst.

[0032] Preferably, in step (b), the stirring time at room temperature is 4h-6h, so that the active components can be better dispersed in the impregnation solution.

[0033] Preferably, in step (c), the temperature of the magnetic stirring is preferably 40°C to 80°C, and the stirring time is 3h to 6h, so that the active component is further dispersed in the impregnation solu...

Embodiment 1

[0037] A. Accurately weigh 0.01mol Ce(NO 3 ) 3 ·6H 2 O and 0.05mol Mn(NO 3 ) 2 , dissolved in 80ml deionized water to form a solution, and magnetically stirred for 30min to mix well.

[0038] B. Accurately weigh 0.05 mol of kaolin and add it to the above-prepared solution. During this process, it is necessary to add kaolin slowly while vigorously stirring the solution magnetically, and magnetically stir for 6 hours at room temperature.

[0039] C. Continue to magnetically stir the white suspension obtained above at 80° C. for 3 h until the mixture becomes viscous.

[0040] D. Keep the above product at 80°C for 15h in a blast drying oven, take it out and bake it in a temperature-programmed muffle furnace at 500°C for 3h.

[0041] The catalyst activity test uses a micro-catalytic device to test the catalyst. The flue gas components used in the experiment are:

[0042] NOx concentration in flue gas is 800ppm, NOx / NH 3 = 1:1;

[0043] o 2 The concentration is 5%;

[0044...

Embodiment 2

[0048] A. Accurately weigh 0.01mol Ce(NO 3 ) 3 ·6H 2 O and 0.08mol Mn(NO 3 ) 2 , dissolved in 80ml deionized water to form a solution, and magnetically stirred for 30min to mix well.

[0049] B. Accurately weigh 0.08 mol of kaolin and add it to the above-prepared solution. During this process, it is necessary to add kaolin slowly while vigorously stirring the solution magnetically, and magnetically stir for 4 hours at room temperature.

[0050] C. Continue to magnetically stir the white suspension obtained above at 40° C. for 6 h until the mixture becomes viscous.

[0051] D. Keep the above product at 80°C for 15h in a blast drying oven, take it out and bake it in a temperature-programmed muffle furnace at 450°C for 4h.

[0052] The catalyst activity test uses a micro-catalytic device to test the catalyst. The flue gas components used in the experiment are:

[0053] NOx concentration in flue gas is 800ppm, NOx / NH 3 = 1:1;

[0054] o 2 The concentration is 5%;

[0055...

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Abstract

The invention belongs to the field of denitration catalysts, and discloses a low-temperature SCR denitration catalyst based on kaoline and a preparation method of the catalyst. The SCR denitration catalyst comprises a carrier and active components attached to the carrier, the carrier is the kaoline, and the active components are manganite and cerium oxide. The invention further discloses the preparation method of the above SCR denitration catalyst. The preparation method comprises the following steps that (a) manganous nitrate and cerous nitrate are selected as raw materials, mixed and dissolved in deionized water to form steeping liquid; (b) the kaoline is added into the steeping liquid, stirring is conducted at the indoor temperature, and suspension liquid is obtained; (c) the suspensionliquid is subjected to magnetic stirring to be in a sticky state, a mixture in the sticky state is obtained, dried and roasted, and the required catalyst is obtained. According to the catalyst and the preparation method, the cost of the catalyst is reduced, the catalysis efficiency is high, and a guidance effect is achieved on research for a low-temperature denitration catalyst.

Description

technical field [0001] The invention belongs to the field of denitration catalysts, and more specifically relates to a kaolin-based low-temperature SCR denitration catalyst and a preparation method thereof. Background technique [0002] Nitrogen oxides (NOx) are an important cause of environmental problems such as acid rain, photochemical pollution, and haze effects, among which coal-fired power plants are one of the important sources of NOx emissions. Selective catalytic reduction (SCR) denitrification is currently the most mainstream flue gas denitrification technology in the world, and the catalyst is the core of SCR technology. At present, vanadium-titanium catalysts are commonly used commercial catalysts, but there are still some problems to be solved. For example, the temperature window is high, so the flue gas environment of the denitrification device is poor, and the wear and poisoning of the catalyst are serious. It is ideal to install the denitrification device af...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/34B01D53/86B01D53/56
CPCB01D53/8628B01D2258/0283B01J23/002B01J23/34
Inventor 张成李权李鑫李伟许豪仲柳余圣辉李胜男谭鹏方庆艳陈刚
Owner HUAZHONG UNIV OF SCI & TECH
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