Low-temperature denitration catalyst as well as preparation method and application thereof

A low-temperature denitration and catalyst technology, applied in chemical instruments and methods, physical/chemical process catalysts, separation methods, etc., can solve the problems of ozone layer destruction, photochemical smog that is harmful to biological health, and narrow working temperature window, to promote reduction. process, excellent reducing ability, and the effect of enriching acid sites

Active Publication Date: 2021-11-02
陕西沣稀嘉创科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] (1) Nitrogen oxides (NOx) emitted from coal combustion x ) can form acidic substances such as nitric acid with water and oxygen in the atmosphere, which will lead to the formation of acid rain and acid fog, corrode nature, animals and plants, human buildings, etc., and have a bad impact on the environment
[0004] (2)NO x After reaching the atmospheric stratosphere, it will consume ozone and break the balance between ozone and oxygen, resulting in the destruction of the ozone layer and bringing catastrophic effects on ecology, the atmosphere, animals and plants, etc.
[0005] (3) When NO x When encountering HC emitted by motor vehicles, it can combine with it to cause the appearance of photochemical smog that is harmful to biological health, and is not conducive to the natural cycle of the atmospheric ecological environment
[0006] (4) NO in nitrogen oxides can combine with hemoglobin in the blood after entering the human body to affect the normal oxygen supply of the human body
[0009] Existing low-temperature denitrification catalysts have a narrow working temperature window and poor selectivity for high-temperature nitrogen
For example, since manganese oxides (MnO x ) at low temperature NH 3 -SCR reaction shows high catalytic performance, so manganese oxide is the current low-temperature NH 3 - The main research object of SCR catalyst; however, as a good low-temperature catalytic material, manganese oxide still has the defects of narrow working temperature window and poor nitrogen selectivity at high temperature

Method used

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

Examples

Experimental program
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Effect test

Embodiment 1

[0063] Prepare FeVO according to the preparation method proposed in the examples of the present invention 4 The steps of the nanorod-loaded Mn-Ce double metal oxide catalyst include:

[0064] (1) Dissolve 0.4g of ferric nitrate nonahydrate and 0.1g of ammonium metavanadate in 15mL of deionized water at 90°C, and stir for 30 minutes to fully dissolve the precursor to form solutions A and B respectively;

[0065] (2) Slowly add solution B dropwise to solution A at 90°C, and then hydrothermally react the obtained suspension in an oven at 160°C for 5 hours;

[0066] (3) After the hydrothermal reaction was cooled to room temperature, the obtained solid sample was washed several times with ethanol, and the obtained product was dried in an oven at 90° C. for 10 h;

[0067] (4) Keep the dried solid powder in a muffle furnace at a heating rate of 1°C / min until the temperature reaches 500°C. After calcination for 3 hours, FeVO is obtained. 4 Nanorod carrier;

[0068] (5) Dissolve 0.0...

Embodiment 2

[0076] Prepare FeVO according to the preparation method proposed by the present invention 4 The steps of nanorod loading Mn-Ce double metal oxide specifically include:

[0077] (1) Dissolve 0.4g of ferric nitrate nonahydrate and 0.1g of ammonium metavanadate in 15mL of deionized water at 90°C, and stir for 30 minutes to fully dissolve the precursor to form solutions A and B respectively;

[0078] (2) Slowly add solution B dropwise to solution A at 90°C, and then hydrothermally react the obtained suspension in an oven at 160°C for 5 hours;

[0079] (3) After the hydrothermal reaction was cooled to room temperature, the obtained solid sample was washed several times with ethanol, and the obtained product was dried in an oven at 90° C. for 10 h;

[0080] (4) Keep the dried solid powder in a muffle furnace at a heating rate of 1°C / min until the temperature reaches 500°C. After calcination for 3 hours, FeVO is obtained. 4 nanorod carrier.

[0081] (5) Dissolve 0.04 g of manganes...

Embodiment 3

[0089] A method for preparing a low-temperature denitration catalyst according to an embodiment of the present invention specifically includes the following steps:

[0090] (1) Dissolve ferric nitrate nonahydrate with a mass of m1 in deionized water with a volume of L1 at 90°C to obtain solution A; at 90°C, dissolve ammonium metavanadate with a mass of m2 in deionized water with a volume of L1 In deionized water, solution B was obtained; wherein, in solution A, 0.3 g of ferric nitrate nonahydrate was dissolved for every 10 mL of deionized water; in solution B, 0.05 g of ammonium metavanadate was dissolved for every 10 mL of deionized water;

[0091] (2) Add solution B dropwise to solution A at 90°C to obtain a suspension; hydrothermally react the obtained suspension at 160°C for 5 hours;

[0092] (3) After the hydrothermal reaction is completed and the temperature is lowered to room temperature, the obtained solid sample is washed several times with ethanol, and the obtained p...

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Abstract

The invention discloses a low-temperature denitration catalyst as well as a preparation method and application thereof. The low-temperature denitration catalyst is a Mn-Ce bimetallic oxide catalyst loaded by a FeVO4 nanorod carrier, wherein the molar ratio of Ce to Mn to FeVO4 is equal to (0.05-0.4):(0.1-0.5):1, and after the active components Mn and Ce are loaded on the FeVO4 nanorod, CeVO3 is generated on the surface of the FeVO4 nanorod. The catalyst disclosed by the invention is FeVO4 nanorod loaded Mn-Ce bimetallic oxide, the surface of a FeVO4 nanorod carrier has abundant acidic sites and excellent reducing capacity, and meanwhile, compared with V2O5, the FeVO4 nanorod carrier has relatively low toxicity and relatively high thermal stability.

Description

technical field [0001] The invention belongs to the technical field of low-temperature denitration catalyst and its preparation, and in particular relates to a low-temperature denitration catalyst and its preparation method and application. Background technique [0002] NO x Emission control has become an urgent need for the country's major policy of "fighting the battle against pollution", for the following reasons: [0003] (1) Nitrogen oxides (NOx) emitted from coal combustion x ) can form acidic substances such as nitric acid with water and oxygen in the atmosphere, resulting in the formation of acid rain and acid fog, corroding nature, animals, plants, human buildings, etc., and causing adverse effects on the environment. [0004] (2)NO x After reaching the atmospheric stratosphere, it will consume ozone and break the balance between ozone and oxygen, resulting in the destruction of the ozone layer and bringing catastrophic effects on ecology, the atmosphere, animals...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/847B01J23/34B01D53/86B01D53/56
CPCB01J23/34B01J23/8472B01D53/8628Y02A50/20
Inventor 石建稳赵书琪牛慈航
Owner 陕西沣稀嘉创科技有限公司
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