Rare-earth doped low-temperature denitration catalyst and preparation method thereof

A low-temperature denitrification and catalyst technology, applied in chemical instruments and methods, physical/chemical process catalysts, separation methods, etc., to achieve the effects of reducing erosion, obvious low-temperature denitrification activity, and reducing operating costs

Active Publication Date: 2013-04-24
ZHEJIANG HAILIANG ENVIRONMENTAL MATERIALS
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Problems solved by technology

[0005] In order to solve V 2 o 5 / TiO 2 Based on the problems encountered in the actual use of high-temperature catalysts in SCR, the present invention aims to provide a low-temperature denitrification catalyst doped with rare earths and its preparation method. The catalyst prepared according to the present invention has high-efficiency NO x deactivation

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  • Rare-earth doped low-temperature denitration catalyst and preparation method thereof

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Embodiment 1

[0013] Example 1: Preparation of a low-temperature denitration catalyst with the molar ratio of each element being Mn:Ce:Ti=5:4:20.

[0014] (1), 90g metatitanic acid is added in water and is mixed with the slurry of concentration 500g / L;

[0015] (2), 434g cerium nitrate (Ce(NO 3 ) 3 ·6H 2 O) be mixed with the solution of 5mol / L; The solubility of manganese nitrate solution is 50%.

[0016] (3), take by weighing 44.75g manganese nitrate solution and pipette the cerium nitrate solution of 20ml, join both solutions in the metatitanic acid slurry simultaneously, stir 30min;

[0017] (4), after the stirring is finished, adjust the pH to 10.2 with 28% ammonia water at a speed of 8ml / min, and stir for 2h; obtain a suspension, and then centrifugally filter the suspension at 3200r / min;

[0018] (6) Finally, the filtered product was dried at 90°C for 24 hours, and then calcined at 450°C at a heating rate of 5°C / min for 2 hours to obtain a low-temperature denitration catalyst.

[...

Embodiment 2

[0022] Example 2: Preparation of a low-temperature denitration catalyst with the molar ratio of each element being Mn:Ce:Fe:Ti=5:4:1:20.

[0023] (1), 90g metatitanic acid is added in water and is mixed with the slurry of concentration 500g / L;

[0024] (2), 434g cerium nitrate (Ce(NO 3 ) 3 ·6H 2 O) and 404g iron nitrate (Fe(NO 3 ) 3 9H 2 O) be mixed with the solution of 5mol / L; The solubility of manganese nitrate solution is 50%.

[0025] (3), take by weighing 44.75g manganese nitrate solution, pipette the cerium nitrate solution of 20ml and the ferric nitrate solution of 5ml, join the three solutions in the metatitanic acid slurry simultaneously, stir 30min;

[0026] (4), after the stirring is finished, adjust the pH to 10.2 with 28% ammonia water at a speed of 8ml / min, and stir for 2h; obtain a suspension, and then centrifugally filter the suspension at 3200r / min;

[0027] (6) Finally, the filtered product was dried at 90°C for 24 hours, and then calcined at 450°C at ...

Embodiment 3

[0029] Example 3: Preparation of a low-temperature denitration catalyst with the molar ratio of each element being Mn:Ce:Fe:Ti=5:4:2:20.

[0030] (1), 90g metatitanic acid is added in water and is mixed with the slurry of concentration 500g / L;

[0031] (2), 434g cerium nitrate (Ce(NO 3 ) 3 ·6H 2 O) and 404g iron nitrate (Fe(NO 3 ) 3 9H 2 O) be mixed with the solution of 5mol / L; The solubility of manganese nitrate solution is 50%.

[0032] (3), take by weighing 44.75g manganese nitrate solution, pipette the cerium nitrate solution of 20ml and the ferric nitrate solution of 10ml, join the three solutions in the metatitanic acid slurry simultaneously, stir 30min;

[0033] (4), after the stirring is finished, adjust the pH to 10.2 with 28% ammonia water at a speed of 8ml / min, and stir for 2h; obtain a suspension, and then centrifugally filter the suspension at 3200r / min;

[0034] (6) Finally, the filtered product was dried at 90°C for 24 hours, and then calcined at 450°C at...

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Abstract

The present invention relates to a rare-earth doped low-temperature denitration catalyst and a preparation method thereof. The main active component of the catalyst is manganese oxide, the carrier is titanium oxide, and cerium oxide and iron oxide are used as cocatalysts. The preparation method includes the following steps: adding solutions of various metal nitrates into a metatitanic acid slurry, then adjusting the pH of the mixture to obtain complete precipitation by using concentrated ammonia, stirring for a while, and performing centrifugal filtration to the resulting suspension, and drying and calcining at a temperature to obtain the rare-earth doped low-temperature denitration catalyst; wherein the molar ratio of each element is as follows: Mn: Fe: Ce: Ti = 5: (0 ~ 2): 4:20. In the temperature range of 140-180 DEG C, the denitration activity of the metal oxide low temperature catalyst of the present invention can reach 80-98%, and the catalyst has a relatively excellent water and sulfur resistance performance.

Description

technical field [0001] The invention belongs to the field of environmental protection, relates to a catalyst and a preparation method thereof, in particular to a method for treating NO x Low-temperature denitrification catalyst doped with rare earth and preparation method thereof. Background technique [0002] With the development of my country's economy, my country's coal energy consumption and the number of motor vehicles have increased significantly, resulting in a rapid increase in the content of various pollutants in the air. After decades of hard work, my country has achieved some success in controlling dust and sulfur dioxide pollution, but NO x pollution has not yet been brought under control. Therefore, how to effectively control NO x emissions have become the focus of the current environmental protection field. [0003] Current emissions of NO from stationary sources x NH is the most effective control measure 3 Selective Catalytic Reduction (SCR) as a reducin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/34B01J23/889B01D53/86B01D53/56
Inventor 陈洪锋刘雪松石磊李燕
Owner ZHEJIANG HAILIANG ENVIRONMENTAL MATERIALS
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