Abstract
A series of catalytic coatings consisting of MnOx-CeO2 and TiO2 support were prepared by atmospheric plasma spraying, which was aimed at the application of selective catalytic reduction (SCR) of NOx. The effect of the load of active component on the coating was firstly studied. The results showed that all the coating presented the highest catalytic activity at approximately 350 °C and the coating with the composition of 20MnOx/5CeO2/TiO2 (wt%) achieved the most powerful performance. The coating was then prepared on a wire-mesh structure substrate, which can be easily assembled as a gas filter. The results showed that the specific surface area was greatly increased resulting in the significant improvement of the catalytic activity of the coating. This strategy offered a promising possibility of removing NOx and particulate fliting simultaneously in industrial applications.
Highlights
Nitrogen oxides (NOx ) are the main pollutants in the air, which are emitted by vehicle exhaust, combustion of fossil fuels, especially from electric power plants
It was shown that all the original TiO2 was in anatase, while MnOx was composed of MnO2 and Mn2 O3
The content of anatase in in anatase, while MnOx was composed of MnO2 and Mn2O3
Summary
Nitrogen oxides (NOx ) are the main pollutants in the air, which are emitted by vehicle exhaust, combustion of fossil fuels, especially from electric power plants. The commercially used catalyst for the SCR process is V2 O5 /TiO2 (anatase) catalyst, which can be enhanced by the addition of WO3 or MoO3 [3,4,5,6,7] This kind of catalyst only has an excellent efficiency at an elevated temperature range (300–400 ◦ C) and will be disable in the environment containing SO2. In this context, the Mn-based catalysts was found to be an excellent candidate in the SCR processing in low temperature, which could be located at the downstream of the desulfurization and particulate control devices. The MnOx can be better dispersed on the TiO2 support, and a fine synergistic effect could be generated between MnOx and anatase [11]
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