Selective catalytic reduction low-temperature denitration catalyst and preparation method thereof

Abstract

The invention relates to a catalyst capable of performing catalytic oxidation on nitric oxides in industrial smoke gas under a low-temperature condition and a preparation process thereof. The preparation method comprises the following steps: (1) dissolving strong acid into water to prepare a strong acid solution; (2) pouring potassium permanganate or soluble salt of iron or cerium into the strong acid solution, stirring to sufficiently mix and dissolve the potassium permanganate or a soluble salt of iron or cerium; (3) performing hydrothermal reaction on the solution; (4) after the hydrothermal reaction, performing suction filtration to obtain oxide precipitates, and washing the oxide precipitates with the acid solution and distilled water respectively; (5) drying the obtained sample; and (6) grinding the dried sample to obtain the required selective catalytic reduction low-temperature denitration catalyst. According to the method, the preparation process is simple, and the selective catalytic reduction low-temperature denitration catalyst with good performance can be prepared by simply weighing, mixing, reacting, filtering and drying, the synthesis temperature is relatively low, roasting is not required, requirements of high-temperature reaction to instruments and equipment are lowered, risks to body safety are avoided, and the advantages are remarkable.

Description

technical field [0001] The invention relates to the field of industrial flue gas treatment, in particular to a catalyst capable of catalyzing and oxidizing nitrogen oxides in industrial flue gas under low temperature conditions and a preparation process thereof. Background technique [0002] Nitrogen oxides (NO x ), as one of the main components of flue gas emitted by industrial production, is the chief culprit of phenomena such as acid rain and photochemical smog, which affects the growth of animals and plants, and even seriously affects human life. With the increasingly prominent environmental problems, countries all over the world have begun to deal with environmental problems. my country has also started to increase the control of industrial flue gas emissions from the "Twelfth Five-Year Plan" and issued a series of policies. Therefore, NOx control is imperative. [0003] Among the many denitrification technologies, Selective Catalytic Reduction (SCR) has the characte...

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Problems solved by technology

The catalyst prepared by the sol-gel method is uniformly dispersed, the particles are small, and has a large specific surface area, but the raw material is expensive and the process control process is complicated. At the same time, the use of organic raw materials is harmful to human health; the precipitation method adds the precipitant to the After the reaction in the salt solution, the precipitation is heat-treated to obtain nanomaterials, which is simple and easy, but the purity is low and the particle radius is large; while the impregnation method is simple to operate, saves materials, low cost, and is closer to industrial production, but the drying process easily leads to active components. Migration, and the roasting process is also prone to produce polluting gases

In addition, in order to obtain higher activity and exclude unnecessary components at the same time, in the process of preparing catalysts by the above methods, most of the samples must undergo a heat treatment process above 400 ° C, resulting in a large amount of energy consumption, and some preparation methods require more equipment. Higher, requires a lot of investment, which undoubtedly increases the production cost of the catalyst

[0005] For the traditional methods of preparing catalysts, there are inevitably problems such as high cost, high energy consumption, heavy pollution or difficult operation, which is not conducive to the preparation and development of catalysts

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