Method for preparing SCR (Selective Catalytic Reduction) denitration catalyst by slag and catalyst thereof

Abstract

The invention relates to a method for preparing SCR (Selective Catalytic Reduction) denitration catalyst by slag and a catalyst thereof. The catalyst uses slag remained after potassium manganate is extracted as a main raw material. The preparation method comprises the following steps of: washing slag by a nitric acid solution, filtering the slag, drying and pulverizing; fully mixing filter slag powder with active carbon powder; then after adding titanium dioxide sol and deionized water for being adjusted into proper slurry, rubbing into strips and preparing small balls; and drying and roasting in sequence for activating. Compared with the prior art, the SCR denitration catalyst has catalytic activity in the range of smoke temperature of 150-350 DEG C and higher catalytic activity compared with the prior art within 200 DEG C and 300 DEG C (particularly 250 DEG C or so); and by applying the catalyst of the invention for carrying out SCR denitration, the denitration rate is high. The invention also has the advantages of raw material cost saving, elimination of pollution of high-valence manganese-contained wastes on environment and simple preparation process.

Description

technical field [0001] The invention relates to an SCR denitration catalyst, in particular to an SCR denitration catalyst prepared by using slag. Background technique [0002] In the flue gas produced by the thermal power plant during the high temperature combustion process, there is a large amount of NO X (nitrogen oxides, mainly including NO, NO 2 , N 2 O, etc.). These NO X It will not only lead to photochemical smog, greenhouse effect and damage to the ozone layer, but also is one of the main components of acid rain, which has a more direct adverse effect on people's health. Therefore, it is also necessary to control NO in flue gas treatment X Treatment (this process is called denitrification of flue gas). Ammonia selective catalytic reduction (Selective Catalytic Reduction, SCR) has become the main denitrification technology for stationary sources such as thermal power plants due to its maturity and high efficiency. Its core lies in the development of denitrificati...

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Problems solved by technology

However, when using the SCR denitrification catalyst prepared by this method, its denitrification rate is not high enough (in the verification with simulated flue gas, the highest is only 66.6%), only after it is equipped with electrolytic manganese anode slime, its denitrification rate rate increased

For enterprises that only extract (produce) potassium manganate from manganese ore, but do not produce electrolytic manganese, at least because of the lack of electrolytic manganese anode slime, they cannot improve the denitrification rate when using the SCR denitrification catalyst

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