Low-temperature SCR (selective catalytic reduction) flue gas denitration catalyst with gamma-MnO2 nanometer sheets, method for preparing low-temperature SCR flue gas denitration catalyst and application thereof

Abstract

The invention belongs to the field of environmental protection and nanometer catalysis, and discloses a low-temperature SCR (selective catalytic reduction) flue gas denitration catalyst with gamma-MnO2 nanometer sheets, a method for preparing the low-temperature SCR flue gas denitration catalyst and application thereof. The method includes (1), preparing aqueous solution from potassium permanganate to obtain potassium permanganate solution and preparing aqueous solution from manganese chloride to obtain manganese chloride solution; (2), dripping the manganese chloride solution into the potassium permanganate solution under stirring conditions and uniformly mixing the manganese chloride solution and the potassium permanganate solution with each other to obtain mixed liquid; (3), carrying out hydro-thermal synthesis reaction on the mixed liquid obtained in the step (2) in hydro-thermal reaction kettles to obtain a product, and centrifuging, washing and drying the product to obtain the low-temperature SCR flue gas denitration catalyst with the gamma-MnO2 nanometer sheets. The low-temperature SCR flue gas denitration catalyst, the method and the application have the advantages that the gamma-MnO2 nanometer sheets of the low-temperature SCR flue gas denitration catalyst prepared by the aid of the method have a single crystal form, complete morphological structures and uniform particle sizes, and the low-temperature SCR flue gas denitration catalyst is high in yield; the low-temperature SCR flue gas denitration catalyst is high in oxidation-reduction capacity and has large quantities of strong acid sites, and the low-temperature denitration activity of the low-temperature SCR flue gas denitration catalyst can be effectively expressed.

Description

technical field [0001] The invention belongs to the field of environmental protection and nano-catalysis, in particular to a γ-MnO 2 Nanosheet low-temperature SCR flue gas denitrification catalyst and its preparation method and application. Background technique [0002] Nitrogen oxides (NO x ) is one of the main air pollutants, which will cause a series of environmental problems such as acid rain, photochemical smog, ozone hole and fine particle pollution, and also have great harm to human health and ecological environment. How to effectively control and reduce the emission of nitrogen oxides is the key to solving the problem of atmospheric environmental quality in the future. Nitrogen oxides mainly come from the combustion of fossil fuels. According to statistics, the vast majority of national industrial nitrogen oxides emissions come from the power and heat production and supply industries, among which the contribution of nitrogen oxides in the thermal power industry is ...

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Problems solved by technology

The traditional method to improve catalytic activity is to reduce the size of catalyst particles to expose more surface active sites, that is, the size effect in nanocatalysis, but this method often comes with a certain degree of empirical and randomness

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