Method for preparing flue gas SCR (Selective Catalytic Reduction) denitration catalyst

Abstract

The invention relates to a method for preparing a flue gas SCR (Selective Catalytic Reduction) denitration catalyst. The method comprises the following steps of: mixing ammonium metavanadate, oxalic acid, manganese salt and water for preparing a mixture solution, adding titanium dioxide powder into the mixture solution, heating in water bath and stirring, and obtaining mixed sol by standing at room temperature; putting the mixed sol into a microwave oven, heating and drying by utilizing microwave radiation; and putting dried solid into a muffle furnace for burning. According to the method disclosed by the invention, a temperature window of the SCR catalyst can be broadened to a low-temperature direction, the problems of low denitration efficiency at low temperature and narrow temperature window of a commercial catalyst are solved; compared with the traditional drying method, the microwave radiation heating and drying method has the advantages that low-temperature SCR denitration activity of the composite catalyst can be increased to a large extend, when the activity temperature is up to 250 DEG C, the denitration efficiency of the catalyst prepared by the traditional drying method is up to 51.9%, and the denitration efficiency of the catalyst can be increased by 31.7 percentage points and can be up to 83.6% by the microwave radiation heating and drying method.

Description

technical field [0001] The invention relates to a preparation method of a denitrification catalyst, belonging to the fields of flue gas denitrification technology and microwave technology. Background technique [0002] Nitrogen oxides are one of the main air pollutants, which can cause pollution such as acid rain and photochemical smog, and cause great harm to the environment and human body. Nitrogen oxide emissions from coal-fired power plants account for about half of my country's total emissions. Therefore, controlling NOx from coal-fired power plants x Emissions are imminent. At present, technologies to control NOx emissions from coal-fired power plants mainly include low NO x Burners, reburning, Selective Non-Catalytic Reduction (SNCR) and Selective Catalytic Reduction (SCR). Compared with denitration technologies such as reburning denitration and SNCR denitration, SCR has higher denitration efficiency and is easy to meet the increasingly stringent NO x national emi...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to combine microwave radiation technology with the advantages of rapid heating and no temperature gradient, and apply microwave radiation technology to the preparation of power plant SCR denitrification catalyst, and provide a preparation method of flue gas SCR denitration catalyst, which solves the problem of catalyst High energy consumption for preparation, high cost of SCR denitrification, low denitrification efficiency of commercial catalysts at low temperature and narrow denitrification temperature window, etc.

Images