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Low-temperature rare-earth-based sulfur-resistant and water-resistant denitration catalyst and preparation method thereof

A denitration catalyst, rare earth-based technology, applied in chemical instruments and methods, heterogeneous catalyst chemical elements, physical/chemical process catalysts, etc., can solve problems such as narrow active temperature window, toxic V, environmental and human health hazards, etc. Achieve high denitration efficiency and improve the effect of sulfur and water resistance

Inactive Publication Date: 2020-09-15
WUXI WEIFU ENVIRONMENT PROTECTION CATALYST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Metal Oxide Catalysts NH under Oxygen-rich Conditions 3 -It has good catalytic activity in the SCR reaction, and the current power plant is equipped with V 2 o 5 -WO 3 / TiO 2 Catalyst, but its activity temperature window is narrow, and the V used is poisonous, which will cause serious harm to the environment and human health. The "Notice on Strengthening the Supervision of Waste Flue Gas Denitrification Catalysts" issued by the Ministry of Environmental Protection of my country clearly states that waste Flue gas denitrification catalyst (vanadium-titanium series) included in hazardous waste management

Method used

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  • Low-temperature rare-earth-based sulfur-resistant and water-resistant denitration catalyst and preparation method thereof
  • Low-temperature rare-earth-based sulfur-resistant and water-resistant denitration catalyst and preparation method thereof
  • Low-temperature rare-earth-based sulfur-resistant and water-resistant denitration catalyst and preparation method thereof

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Embodiment 1

[0025] A low-temperature rare earth-based anti-sulfur and water-resistant denitration catalyst, comprising a porous ceramic carrier and a rare earth-based catalyst coating coated on the carrier. The weight ratio of each component in the rare-earth-based catalyst is: 20 parts of alumina, 50 parts of cerium oxide, and oxidation 10 parts of manganese and 2.5 parts of iron oxide, the size of the porous ceramic carrier is 100mm*100mm*50mm, and the number of holes is 25-300 mesh.

[0026] The preparation method of the low-temperature rare earth-based anti-sulfur and water-resistant denitration catalyst includes the following steps:

[0027] (1) Preparation of active component composite oxide by co-precipitation method: Al(NO 3 ) 3 With Ce(NO 3 ) 3 With Mn(NO 3 ) 2 Mix it in the sodium hydroxide aqueous solution according to the above ratio, stir well, adjust the pH of the mixed solution to 7.5, wash, filter, dry, crush, and calcin the solid product to obtain alumina-cerium oxide-manganese...

Embodiment 2

[0031] A low-temperature rare earth-based anti-sulfur and water-resistant denitration catalyst, comprising a porous ceramic carrier and a rare earth-based catalyst coating coated on the carrier. The weight ratio of each component in the rare-earth-based catalyst is: 20 parts of alumina, 50 parts of cerium oxide, and oxidation 10 parts of manganese and 2.5 parts of cobalt oxide, the size of the porous ceramic carrier is 100mm*100mm*50mm, and the number of holes is 25-300 mesh.

[0032] The preparation method of the low-temperature rare earth-based anti-sulfur and water-resistant denitration catalyst includes the following steps:

[0033] (1) Preparation of active component composite oxide by co-precipitation method: Al(NO 3 ) 3 With Ce(NO 3 ) 3 With Mn(NO 3 ) 2 Mix it in the sodium hydroxide aqueous solution according to the above ratio, stir well, adjust the pH of the mixed solution to 7.5, wash, filter, dry, crush, and calcin the solid product to obtain alumina-cerium oxide-mangane...

Embodiment 3

[0037] A low-temperature rare earth-based anti-sulfur and water-resistant denitration catalyst, comprising a porous ceramic carrier and a rare earth-based catalyst coating coated on the carrier. The weight ratio of each component in the rare-earth-based catalyst is: 20 parts of alumina, 50 parts of cerium oxide, and oxidation 10 parts of manganese and 2.5 parts of nickel oxide, the size of the porous ceramic carrier is 100mm*100mm*50mm, and the number of holes is 25-300 mesh.

[0038] The preparation method of the low-temperature rare earth-based anti-sulfur and water-resistant denitration catalyst includes the following steps:

[0039] (1) Preparation of active component composite oxide by co-precipitation method: Al(NO 3 ) 3 With Ce(NO 3 ) 3 With Mn(NO 3 ) 2 Mix it in the sodium hydroxide aqueous solution according to the above ratio, stir evenly, adjust the pH of the mixed solution to 8, and wash, filter, dry, crush and calcinate the solid product to obtain alumina-cerium oxide-m...

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Abstract

The invention belongs to the technical field of catalysts, and particularly relates to a low-temperature rare-earth-based sulfur-resistant and water-resistant denitration catalyst and a preparation method thereof. The low-temperature rare-earth-based sulfur-resistant and water-resistant denitration catalyst comprises a porous ceramic carrier and a rare earth-based catalyst coating coated on the carrier, wherein the rare earth-based catalyst coating comprises an active component and an auxiliary agent; the active component comprises an alumina-cerium oxide-manganese dioxide composite oxide; andthe auxiliary agent comprises one or more of Fe, Co, Ni, W, Y and Cr. The invention further discloses a method for preparing the catalyst active component through coprecipitation. According to the rare earth-based denitration catalyst disclosed by the invention, the aluminum oxide-cerium oxide-manganese dioxide composite oxide is prepared by adopting a coprecipitation method, so that the low-temperature activity of the catalyst is higher and the activation temperature window is expanded; in addition, due to the introduction of the auxiliaries, the sulfur resistance and water resistance of therare earth-based catalyst are enhanced, and the rare earth-based catalyst can be widely applied to denitration treatment of tail gas of thermal power plants and cement plants.

Description

Technical field [0001] The invention belongs to the technical field of catalysts, and specifically relates to a low-temperature rare earth-based sulfur-resistant and water-resistant denitration catalyst and a preparation method thereof. Background technique [0002] NOx is not only the main contributor to acid rain, but also a prerequisite for the formation of near-surface atmospheric ozone pollution, photochemical smog, secondary fine particle pollution, and surface eutrophication. The problems caused by this have become the most common problem with ozone layer destruction and global climate change. Outstanding hot issues of atmospheric environment. [0003] At present, Selective Catalytic Reduction (SCR) is considered to be the best denitration technology. It uses ammonia or other reducing agents to selectively reduce NOx to N under the action of a specific catalyst. 2 Methods. Among them, NH 3 The SCR technology, which is a reducing agent, has been widely used because of its hi...

Claims

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Application Information

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IPC IPC(8): B01J23/889B01J23/34B01J35/02B01J35/10B01D53/86B01D53/56
CPCB01J23/002B01J23/8892B01J23/34B01D53/8628B01J2523/00B01J35/60B01J35/40B01J2523/31B01J2523/3712B01J2523/72B01J2523/842B01J2523/845B01J2523/847B01J2523/69B01J2523/67
Inventor 李卫卫卫伟王泱泓李爱国蔡晓江吕衍安胡怡帆姜闵闵郝士杰贾莉伟徐岘王家明
Owner WUXI WEIFU ENVIRONMENT PROTECTION CATALYST