A preparation method of Mn-based rod-shaped microscopic composite oxide low-temperature denitration catalyst

Abstract

The invention discloses a preparation method of a Mn-based rodlike microtopography composite oxide low-temperature denitrification catalyst, and belongs to the field of pollution control and techniques. The preparation method comprises the following steps of dissolving salt precursors of metal elements into distilled water to prepare a salt solution by taking MnOx as a catalyst and one or more of Ag, Cu, Fe, Ce and Co as additives, wherein NiOx is the important active component of the catalyst; and meanwhile, preparing a urea aqueous solution, mixing the salt solution and the urea aqueous solution uniformly, stirring and crystallizing at the reaction temperature of 50-120 DEG C for 4-12 hours, filtering, washing, drying, and forging and the like to prepare the Mn-based rodlike microtopography composite oxide low-temperature denitrification catalyst. The catalyst is applied to the selective catalytic reduction (NH3-SCR)NO by adopting NH3 as a reducing agent. The Mn-based rodlike microtopography composite oxide low-temperature denitrification catalyst has good low-temperature denitrification performance, is simple and convenient to prepare, is mild in condition, and has good application value in the denitrification field based on the NH3-SCR technique.

Description

technical field [0001] The invention belongs to the field of gas purification and denitration catalyst preparation, and relates to a preparation method of a flue gas denitration catalyst, in particular to a preparation method of a Mn-based rod-shaped microscopic composite oxide low-temperature denitration catalyst. Background technique [0002] Nitrogen oxides (NO x ) is an important cause of environmental problems such as acid rain, photochemical smog, ozone depletion, and haze weather, and is an air pollutant that needs to be controlled. NO x It can cause human emphysema, vision loss, bronchitis and other diseases, seriously endangering human health, and can also cause great harm to crops and buildings. NO produced by various pollution sources x Predominantly in the form of NO, while NO in other forms x Relatively small. [0003] At present, it is generally believed that selective catalytic reduction (SCR) denitrification technology is one of the most effective means ...

AI Technical Summary

Problems solved by technology

[0003] At present, it is generally believed that selective catalytic reduction (SCR) denitrification technology is one of the most effective means to control NO pollutants in flue gas. The V-W-Ti system and its modified catalyst are relatively mature in industrial application, but the catalyst still exists. Some shortcomings are mainly manifested in: (1) the vanadium-containing catalyst is poisonous and easily pollutes the environment; (2) the applicable temperature of the vanadium-containing catalyst is relatively high, generally 350°C and above; (3) during the use of the vanadium-containing catalyst, prone to SO 2 to SO 3 conversion, accelerate the deposition of ammonium sulfate species on the surface of the catalyst, and shorten the service life of the catalyst

Images