Catalyst for low-temperature denitration of power-plant flue gas by selective catalytic reduction (SCR) and preparation method thereof

A low-temperature denitrification and catalyst technology, applied in the direction of catalyst activation/preparation, physical/chemical process catalyst, metal/metal oxide/metal hydroxide catalyst, etc., can solve the problem of single component, no anti-SO2 poisoning ability, Oxide catalytic activity reduction and other problems, to achieve a good anti-SO2 poisoning effect
CN101676019AInactive Publication Date: 2010-03-24河北晶锐瓷业有限公司
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
河北晶锐瓷业有限公司
Publication Date
2010-03-24
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention relates to a catalyst for low-temperature denitration of power-plant flue gas by selective catalytic reduction (SCR) and a preparation method thereof. Tungsten-doped titanium pigment synthesized by metatitanic acid serous fluid and ammonium paratungstate oxalic acid solution which are manufactured in China is used as the carrier of the catalyst to largely reduce the cost. The catalyst uses cerium oxides as main active components and titanium dioxides as carriers, two or more of oxides of valence-variable metal manganese, iron, vanadium or chromium are added as catalyst promoters,and additionally, silicon oxides are added to increase the strength of the catalyst. The denitration efficiency of the catalyst prepared by the method reaches more than 90% at 180 DEG C; at 200 DEG C, the activity approximates to 100%, and the catalyst has favorable capability for resisting SO2 poisoning; and at the reaction temperature of 200 DEG C, the added SO2 hardly has effect on the activity of the catalyst.
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Description

technical field

[0001] The invention relates to a catalyst for low-temperature denitrification of flue gas in an ammonia selective catalytic reduction (SCR) power plant and a preparation method thereof Background technique

[0002] Most of my country's large power plants are conventional coal-fired power plants. Nitrogen oxide (NOx) is one of the main pollutants emitted by coal-fired power plants. According to its formation mechanism, it is mainly controlled by low-NOx combustion technology or flue gas removal. Ammonia is the choice of reducing agent. Sexual catalytic reduction (SCR) is currently an effective method for flue gas denitrification, and most commercial catalysts are V 2 o 5 / TiO 2 The applicable temperature of the catalyst is 300-400°C, so the installation position of the SCR reactor in the power plant is mostly located before the boiler system air preheater and electrostatic precipitator, so the high concentration of soot in the flue gas will affect the deni...

Claims

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