Low-temperature SCR (selective catalytic reduction) smoke gas efficient denitration catalyst and preparation method thereof

Abstract

The invention relates to a low-temperature SCR (selective catalytic reduction) smoke gas efficient denitration catalyst and a preparation method thereof, and belongs to the technical field of catalyst manufacturing. The catalyst uses titanium dioxide as carriers, and contains tungsten oxide, vanadium oxide and antimony oxides or contains rare earth metal cerium oxide; the catalyst without rare earth metal cerium oxide has a little lower denitration efficiency than the catalyst containing rare earth metal cerium oxide. The denitration efficiency of the catalyst reaches 85 percent or more at the low temperature of 130 degrees; the value is much higher than the current condition of the denitration efficiency of being less than 50 percent in the prior art. The low-temperature activity of the catalyst is good; a good oxynitride removal rate and water-resistant and sulphur-resistant performance can be realized within the temperature range of 130 to 250 DEG C; the catalyst has high activity and toxicity resistance at 130 to 250 DEG C, so that the catalyst can be installed behind a coal-fired boiler dust remover; the defects of the existing smoke gas denitration technology are overcome; the catalyst can also be applied to the smoke gas denitration of industrial kilns and the like.

Description

technical field [0001] The invention relates to a low-temperature SCR flue gas high-efficiency denitrification catalyst and a preparation method thereof, belonging to the technical field of catalyst manufacture. Background technique [0002] Nitrogen oxides (NOx), including NO, NO2, N2O, etc., are the main air pollutants. Nitrogen oxides in the atmosphere can cause acid rain, photochemical smog, the greenhouse effect and the destruction of the ozone layer. It also endangers human health and causes diseases such as bronchitis and pneumonia. 63% of NOx in the atmosphere comes from industrial pollution and traffic pollution, twice that of natural sources, of which emissions from the power industry and automobile exhaust each account for 40%, and other industrial pollution sources account for 20%. [0003] There are 2 methods to reduce NOx emissions, they are combustion process control and flue gas denitrification after combustion. At this stage, it is mainly achieved by cont...

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Problems solved by technology

[0011] In order to solve the problem of low denitrification efficiency of low-temperature SCR denitrification catalysts in the prior art at 130-250°C, the present invention provides a low-temperature SCR flue gas high-efficiency denitrification catalyst and its preparation method to improve decombustion at lower low temperature conditions. The efficiency of nitrogen oxides in the flue gas of coal boilers to achieve the emission standards of flue gas from coal-fired boilers and flue gas from most industrial kilns

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