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Zirconium-doped lanthanum-manganese-based SCR denitration catalyst and preparation method thereof

A denitration catalyst, lanthanum-manganese-based technology, applied in the field of zirconium-doped lanthanum-manganese-based SCR denitration catalyst and its preparation, can solve the problems of wide temperature and narrow opening, low activity, deactivation, etc. The process is simple and the effect of enhancing the anti-sulfur and water-resistant properties

Active Publication Date: 2021-06-15
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to provide a zirconium-doped lanthanum-manganese-based SCR denitration catalyst and its preparation method, which can solve the problem of vanadium-based NH 3 - The problem of low activity of SCR catalyst, wide temperature and narrow mouth can also solve the problem of non-vanadium-based NH 3 -SCR catalyst's susceptibility to H 2 O and SO 2 The problem of inactivation due to the influence of

Method used

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  • Zirconium-doped lanthanum-manganese-based SCR denitration catalyst and preparation method thereof
  • Zirconium-doped lanthanum-manganese-based SCR denitration catalyst and preparation method thereof
  • Zirconium-doped lanthanum-manganese-based SCR denitration catalyst and preparation method thereof

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Embodiment 1

[0031] This embodiment provides a method for preparing a zirconium-doped lanthanum-manganese-based SCR denitration catalyst, comprising the following steps:

[0032] (1) Preparation of precursor

[0033] Take 6.928g of lanthanum nitrate, 1.7173g of zirconium nitrate and 4.65ml of 50% manganese nitrate solution, dissolve in 100ml of distilled water, and stir evenly;

[0034] (2) Alkalinity adjustment

[0035] Add 15.37g of anhydrous citric acid to the mixed solution in step (1), stir until completely mixed and dissolved, slowly add pH regulator ammonia water and keep stirring, adjust pH=8;

[0036] (3) Preparation of gel

[0037] Stir the product of step (2) in a water bath at 90°C until the water is evaporated to obtain a gel;

[0038] (4) aging calcined molding

[0039] Aging and drying the gel in the aging equipment at 120°C for 24h, calcining the product at 400°C for 3h at a heating rate of 5°C / min, then raising the temperature to 800°C for 3 hours at a heating rate of ...

Embodiment 2

[0041] This embodiment provides a method for preparing a zirconium-doped lanthanum-manganese-based SCR denitration catalyst, comprising the following steps:

[0042] (1) Preparation of precursor

[0043] Take 6.062g of lanthanum nitrate, 2.5759g of zirconium nitrate and 4.65ml of 50% manganese nitrate solution, dissolve in 100ml of distilled water, and stir evenly;

[0044] (2) Alkalinity adjustment

[0045] Add 15.37g of anhydrous citric acid to the mixed solution prepared in step (1), stir until completely mixed and dissolved, slowly add the pH regulator ammonia water and keep stirring to adjust the pH of the solution to 8;

[0046] (3) Preparation of gel

[0047] Stir the product of step (2) in a 90°C water bath until the water is evaporated to obtain a gel;

[0048] (4) aging calcined molding

[0049] Aging and drying the gel in the aging equipment at 120°C for 24h, calcining the product at 400°C for 3h at a heating rate of 5°C / min, then raising the temperature to 800°...

Embodiment 3

[0051] This embodiment provides a method for preparing a zirconium-doped lanthanum-manganese-based SCR denitration catalyst, comprising the following steps:

[0052] (1) Preparation of precursor

[0053] Take 4.330g of lanthanum nitrate, 4.2932g of zirconium nitrate and 4.65ml of 50% manganese nitrate solution, dissolve in 100ml of distilled water, and stir evenly;

[0054] (2) Alkalinity adjustment

[0055] Add 15.37g of anhydrous citric acid to the mixed solution prepared in step (1), stir until completely mixed and dissolved, slowly add the pH regulator ammonia water and keep stirring to adjust the pH=8;

[0056] (3) Preparation of gel

[0057] Stir the product obtained in step (2) in a water bath at 90°C until the water is evaporated to dryness to obtain a gel;

[0058] (4) aging calcined molding

[0059] Aging and drying the gel in the aging equipment at 120°C for 24h, calcining the product at 400°C for 3h at a heating rate of 5°C / min, then raising the temperature to 80...

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Abstract

The invention discloses a zirconium-doped lanthanum-manganese-based SCR denitration catalyst and a preparation method thereof. The preparation method comprises the following steps: (1) preparing a precursor; (2) conducting alkalinity adjustment; (3) preparing gel; and (4) conducting aging, calcining and forming. The catalyst is prepared by one-step synthesis through a citric acid sol-gel method, has a perovskite structure, is wide in SCR denitration activity temperature window, can keep excellent SCR denitration activity in the wide temperature window of 120-280 DEG C, has the nitrogen oxide removal rate of 90% or above, and maintains the nitrogen oxide removal rate of 100% at 140-240 DEG C, and in addition, the sulfur resistance and water resistance of the catalyst can be effectively improved, and the removal rate of nitrogen oxides can be kept to be 95% or above under the test condition.

Description

technical field [0001] The invention relates to the technical field of denitration catalyst preparation, in particular to a zirconium-doped lanthanum manganese-based SCR denitration catalyst and a preparation method thereof. Background technique [0002] The emission of nitrogen oxides (NOx) in the atmosphere not only causes environmental problems such as smog, acid rain and photochemical smog, but also seriously threatens human health. Therefore, how to effectively control NOx in the atmosphere has become a research hotspot in the field of environmental protection today. [0003] Among many denitrification technologies, NH 3 -SCR is the most effective method, and the core is the choice of catalyst. At present, the catalyst widely used in industry is V 2 o 5 -WO 3 (MoO 3 ) / TiO 2 , but it is only suitable for the flue gas denitrification of industrial kilns with high exhaust gas temperature, and the catalyst is easy to deactivate, the service life is not long, and the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/34B01J37/03B01J37/08B01D53/56B01D53/86B01D53/90
CPCB01J23/34B01J37/036B01J37/086B01D53/8628B01D53/90B01D2257/404B01D2258/06B01J35/394Y02C20/10
Inventor 郭家秀史雪珂李建军楚英豪袁山东
Owner SICHUAN UNIV
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