Mn-Ce supported low temperature denitration catalyst and preparation method thereof

Abstract

The invention discloses a Mn-Ce supported low temperature denitration catalyst and a preparation method thereof. The catalyst is mainly composed of cerium nitrate hexahydrate, urea, PAA, potassium permanganate, manganese nitrate, and glacial acetic acid; and is prepared by the following steps: preparing a cerium dioxide carrier and loading active components on the carrier through hydrothermal deposition. Common chemical reagents such as cerium nitrate, urea, and the like are used to prepare the nano cerium dioxide catalyst; the preparation process is simple and controllable; compared with the cerium dioxide purchased in the market, the catalyst has the advantages of good dispersing property, small particles, larger specific surface area, better oxygen storing and releasing ability, and strong antitoxin performance; the neutralization reactions between potassium permanganate and manganese nitrate are utilized, cerium dioxide is taken as the substrate to carry out redox reactions to obtain a mixture precipitate of manganese oxides and cerium dioxide, and then the mixture precipitate is subjected to a post treatment to obtain the supported manganese-based low temperature denitration catalyst. According to the preparation method, only a hydrothermal method is adopted, the related technology is simple, the cost is low, and the efficiency is high.

Description

technical field [0001] The invention belongs to the field of industrial flue gas treatment, and in particular relates to a Mn-Ce loaded low-temperature denitrification catalyst and a preparation method thereof. Background technique [0002] Nitrogen oxides (NO x ) is a general term for various compounds of nitrogen and oxygen, mainly from flue gas discharged from stationary sources such as thermal power plants and motor vehicle exhaust, etc., and almost 95% (volume fraction) of NO in flue gas x It exists in the form of NO, so the conversion of NO is the removal of NO x key steps. to NO x Emission control includes two aspects: combustion process control and post-combustion flue gas denitrification. Among many denitrification technologies, selective catalytic reduction technology (SCR) is the most mature denitrification technology with the highest denitrification rate and the most applications. This technology uses ammonia or other reducing agents to selectively reduce NO ...

AI Technical Summary

Problems solved by technology

But currently, CeO 2 It is mainly used as a carrier additive; and the common preparation methods of supported metal oxide catalysts are generally precipitation method, sol-gel method and impregnation method, etc. In the preparation process of these methods, many factors need to be considered, the control steps are complicated, and the obtained The product needs to be calcined, which can easily lead to changes in the microstructure during the sintering process (such as the collapse of the pore structure, a sharp decrease in the surface area, etc.) and the mixing of impurities.