Denitration catalyst and preparation method thereof

Abstract

The invention discloses a denitration catalyst and a preparation method thereof. The preparation method comprises the following steps: preparing a precipitate mixture of titanium hydroxide and aluminium hydroxide; drying and roasting the precipitate mixture to obtain TiO2-Al2O3 compound oxide carrier powder; extruding, forming, sizing and drying the TiO2-Al2O3 compound oxide carrier powder, activated carbon powder, enamelled powder and an adhesive to obtain an activated carbon / TiO2-Al2O3 compound catalyst; dissolving ammonium metatungstate and ammonium metavanadate in oxalic acid to obtain first impregnation liquid; impregnating the activated carbon / TiO2-Al2O3 compound catalyst in the first impregnation liquid to obtain a V2O5-WO3 / activated carbon / TiO2-Al2O3 compound catalyst; preparing second impregnation liquid; and impregnating the V2O5-WO3 / activated carbon / TiO2-Al2O3 compound catalyst in second impregnation liquid to obtain the denitration catalyst. The denitration catalyst prepared by the method disclosed by the invention has relatively high denitration catalytic activity, is high in wear resistance and acid resistance and wide in active temperature region, and can recover waste heat while performs denitration treatment on to-be-treated flue gas.

Description

technical field [0001] The invention relates to the technical field of chemical engineering, in particular, the invention relates to a denitration catalyst and a preparation method thereof. Background technique [0002] NO emissions from human activities x More than 90% comes from the fuel combustion process. When fuels in various industrial furnaces, civil stoves, motor vehicles and other internal combustion engines are burned at high temperature, the nitrogen-containing substances in the fuel are oxidized to produce NO x , the N in the air involved in the combustion 2 and O 2 also generates NO x . From the perspective of energy structure, coal occupies an absolute dominant position in the composition of primary energy and power generation energy in China. And more than 80% of coal in our country is directly burned, especially for power plants, industrial boilers and civil boilers. Therefore, for a long period of time, the NO in flue gas X Emissions are the cause of...

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Problems solved by technology

[0004] The ash content of flue gas from coal-fired power plants in my country is high, which can easily cause a series of problems such as catalyst wear, blockage, poisoning, etc. Catalyst blockage and poisoning can be restored by regeneration, but catalyst wear is the damage of the physical structure of the catalyst, which cannot be regenerated. Wear is the catalyst consumption important factor

In addition, during the production, the denitrification catalyst is in contact with the acidic strong corrosive medium, which leads to serious corrosion of the catalyst, and at the same time as the acid corrosion, there is also the phenomenon of movement and impact of solid particles on the catalyst. Under long-term continuous use conditions, the catalyst is easily damaged

[0005] The existing anti-wear technology of denitration catalyst generally adopts end face hardening, which improves the wear resistance of the catalyst to a certain extent, but the ash content in coal in my country is very high, and the hardening of the end face alone cannot completely solve the problem of catalyst wear, especially in flow In the case of uneven field distribution, the catalyst will undergo non-renewable physical damage such as cracking and collapse due to insufficient wear resistance under the erosion of high ash flue gas

[0006] Therefore, the current denitrification catalysts still need to be improved

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