Abstract
Mn-Ce/FA (M) and Mn-Ce/FA-TiO2 (M), using fly ash (FA) with and without TiO2 as the carriers, were prepared by an integral molding technique. With the increase of TiO2 content, the rates of NO conversion and denitration of Mn-Ce/FA-TiO2 (M) increased, and the NO2 and N2O formation rates decreased. It is found that TiO2 could effectively inhibit the excessive oxidation of NO and the generation of N2O. The effects of space velocity, oxygen concentration and ammonia nitrogen ratio on three types of nitrogen oxides (NO, NO2, N2O) and denitration rates of the Mn-Ce/FA (M) and Mn-Ce/FA-30%TiO2 (M) were further investigated. In addition, it is demonstrated that Mn-Ce/FA (M) and Mn-Ce/FA-30%TiO2 (M) were more suitable to be used in the environment of low sulfur and less water.
Highlights
In 2016, the total energy consumption including coal, oil, gas, hydro, nuclear, wind, etc. in China reached 4.36 billion tce and coal consumption accounted for 62.0% [1].coal will be the dominant energy source in China for a long time
This indicates that the surface area and pore volume of the catalysts can greatly increase by the addition of TiO2
scanning electron microscopy (SEM) micrographs micrographs of fly ash (FA) is an excellent carrier of catalysts due to the irregular micro-spherical structure, developed
Summary
In 2016, the total energy consumption including coal, oil, gas, hydro, nuclear, wind, etc. in China reached 4.36 billion tce (ton of standard coal equivalent) and coal consumption accounted for 62.0% [1]. Research on low temperature SCR monolithic catalysts is mainly related to TiO2 based catalysts. Our previous work studied Mn- and Ce-based catalysts using activated carbon as support for low temperature SCR [11]. Used FA composite attapulgite (PG) as support for Fe and Mn. At a temperature range of 150–300 ◦ C, the denitration rate of the Mn-Fe/PG catalyst could reach more than 80%, performing superior low temperature SCR activity. Extensive research of granular catalysts for low temperature SCR has been done and the denitration rate can be up to 90%, the granular catalyst cannot be directly installed for industrial applications because of its large bed resistance, poor fixation, poor mechanical, etc. Integral molding catalyst has attracted wide attention because of its honeycomb, homogeneous pores, strong mechanical properties, uniform distribution of active components and high denitration rate. The NO2 and N2 O formation rates were investigated in relation to the resistance of the catalysts against water and sulfur
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