Manganese-based low-temperature denitration catalyst and preparation method thereof

Abstract

The invention relates to a manganese-based low-temperature denitration catalyst and a preparation method thereof. The preparation method comprises the following steps of: 1, dissolving manganous nitrate, ferric nitrate, crystal tin tetrachloride and cerous nitrate in water at normal temperature, and stirring the mixture to form transparent solution; 2, preparing solution of ammonium carbonate, dripping the solution of ammonium carbonate into the solution prepared by the step 1, and heating and stirring the mixture to obtain slurry; 3, ultrasonically immersing the slurry, leaching the slurry to obtain a filter cake, and then washing the filter cake with deionized water; and 4, drying and roasting the filter cake to obtain the manganese-based low-temperature denitration catalyst MnFeSnCeOx, wherein the molar ratio of Mn: Fe: Sn: Ce in the prepared catalyst is equal to (35-39):(2-5):(9-35):(54-21). The purification efficiency of nitric oxides reaches 71 to 100 percent when the metallic oxide catalyst is at the temperature of between 80 and 250 DEG C. The composite oxide catalyst has high sulfur resistance.

Description

technical field [0001] The invention relates to a catalyst and a preparation method thereof, in particular to a method for treating NO in exhaust gas from thermal power plants, cement plants, steel plants, oil refineries, etc. X Manganese-based low-temperature denitrification catalyst and preparation method thereof. Background technique [0002] With the growth of coal-based energy consumption and the rapid increase of motor vehicle ownership, a large amount of fossil fuel consumption (stationary and mobile sources), resulting in the emission of nitrogen oxides (NOx) into the atmosphere X ) and other acid-causing substances continue to increase, causing great damage to the environment on which human beings depend. Therefore, how to effectively eliminate nitrogen oxides has become an important topic of concern in the field of environmental protection. [0003] Ammonia Selective Catalytic Reduction (SCR) has become a mainstream denitrification technology for stationary sourc...

AI Technical Summary

Problems solved by technology

However, there are still some problems in the actual use of this technology. First, the high content of fly ash in the flue gas easily blocks the catalyst bed; second, the high content of sulfur in the flue gas easily poisons the catalyst; third, the active component V 2 o 5 The precursors of these compounds are generally very toxic and easily pollute the human body and the environment

However, if the low-temperature SCR technology is adopted, the SCR device is moved to after desulfurization, and a vanadium-free low-temperature SCR catalyst is used, the above problems will no longer exist

Images