Red mud doped manganese and cerium catalyst used for flue gas denitrification, and preparation method thereof

Abstract

The invention discloses a red mud doped manganese and cerium catalyst used for flue gas denitrification, and a preparation method thereof. The preparation method comprises the following steps: 1) putting red mud into water, stirring to evenly disperse, standing, washing precipitates to be neutral, and drying and grinding to obtain a required red mud sample RM; 2) mixing soluble manganous salt and cerium salt with the mixture of ethyl alcohol and water, stirring until the manganous salt and the cerium salt are completely dissolved to obtain mixed solution, then, adding the red mud sample RM into the mixed solution, stirring for set time, meanwhile, adding precipitant into the mixed solution, and regulating to a set pH (Potential of Hydrogen) value; 3) after the mixture stands for ageing set time, separating precipitates from a liquid phase, and washing a solid phase to be neutral; 4) after the washed solid phase is dried and roasted, obtaining required RM catalyst. The red mud is taken as a raw material to prepare the red mud catalyst with high denitrification activity. The preparation method for the red mud has the advantages of being simple, low in energy consumption and light in environment pollution, and has a potential application prospect in an NH3-SCR catalytic denitrification field.

Description

technical field [0001] The invention belongs to the technical field of catalysts, and in particular relates to a red mud-doped manganese-cerium catalyst for flue gas denitrification and a preparation method thereof. Background technique [0002] Nitrogen oxides are one of the most important air pollutants. The massive emission of nitrogen oxides poses a major threat to the earth's ecological environment, and the problem of controlling their emissions needs to be solved urgently. At present, the selective catalytic reduction (SCR) flue gas denitrification technology is widely used in industrial production. In the SCR system, the catalyst is the key. There are many catalyst materials used in the removal of nitrogen oxides, among which noble metal catalysts have good denitrification efficiency. Due to the complex composition of coal-fired flue gas, it contains more dust, SO 2 and trace elements, etc., are likely to cause poisoning, wear, and clogging of this type of catalyst,...

AI Technical Summary

Problems solved by technology

The accumulation of a large amount of red mud will also cause dust hazards

However, with the development of the aluminum industry, the amount of red mud discharged from the production of alumina is also increasing, and a series of problems caused by storage and disposal will follow. out, causing serious environmental problems

In addition to occupying a large amount of land during the stacking process of red mud, the chemical components in the red mud infiltrate the land and easily cause land alkalization and groundwater pollution. People's long-term intake of these substances will inevitably affect their health.

Although attempts have been made to use red mud as a raw material for catalysts in the prior art, red mud is generally sintered with fly ash, bentonite, cullet and other materials in a certain proportion to prepare a catalyst carrier, using the following characteristics of red mud : The particle size of red mud is about 2-10μm, the particles are relatively dispersed, the specific surface area is large, and there is no viscosity

[0004] To sum up, the flue gas denitrification catalysts in the prior art have problems such as narrow operating temperature window, low thermal stability, and high cost, and there is still no effective solution

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