Low-temperature denitration catalyst capable of resisting halogen element Cl poisoning and preparation method and application of low-temperature denitration catalyst

Abstract

The invention relates to a low-temperature denitration catalyst capable of resisting halogen element Cl poisoning and a preparation method and application thereof. The catalyst is prepared through a surface impregnation combustion method, and the preparation method comprises the following steps: (1) dissolving manganous nitrate, cerous nitrate and fuel in deionized water to obtain a mixed solution; (2) adding titanium dioxide into the mixed solution, and uniformly stirring to obtain a precursor product; and (3) burning the precursor product in a combustion chamber, continuously roasting, and grinding the obtained solid reaction product to obtain the target product. The catalyst is used for NH3-SCR reaction. Compared with a catalyst prepared by a traditional impregnation method, the Mn-Ce-Ox / TiO2 low-temperature denitration catalyst prepared by the preparation method disclosed by the invention has relatively good low-temperature denitration activity and halogen element Cl poisoning resistance, and the reduction amplitude of the NOx conversion rate of the catalyst is relatively small in a temperature range of 100-200 DEG C; equipment required in the preparation process is simple, the cost of raw materials is low, the combustion reaction is mild, and the method is a simple, safe and reliable new method.

Description

technical field [0001] The invention relates to the technical field of chemical catalysts, in particular to a Mn-Ce-O compound resistant to halogen element Cl poisoning x / TiO 2 Low-temperature denitrification catalyst and its preparation method and application. Background technique [0002] With the rapid development of the economy, the combustion of a large amount of fossil fuels and the emission of automobile exhaust have produced a lot of dust, sulfur dioxide (SO 2 ), nitrogen oxides (NO x ) and other air pollutants. NO x It is one of the main air pollutants and an important cause of air pollution phenomena such as acid rain, photochemical smog, and haze, and has become the focus of air pollution control. use NH 3 Performing selective catalytic reduction (SCR) has proven to be an effective after-combustion treatment technology to control NO emissions from stationary sources. However, two major problems emerged during the use of this technology in the industrial fi...

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Problems solved by technology

However, two major problems emerged during the use of this technology in the industrial field: (1) The high activity temperature (300-400°C) of traditional SCR catalysts always requires auxiliary equipment and extra energy to heat the bag (2) The SCR catalyst has poor resistance to the inevitable deactivation caused by complex flue gas components, which greatly increases the cost of catalyst replacement and even leads to the target Abnormal discharge of pollutants

The catalyst prepared by ordinary impregnation method will limit its dispersibility due to the high content of active components, thereby reducing the activity; although the sol-gel method can solve the problem of low dispersibility, it has the disadvantages of long preparation period, complicated operation, Disadvantages such as limited scope

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