Manganese oxide nanorod catalysts for low-temperature selective catalytic reduction of NO with NH₃
2022
Wang, Yifan | Wang, Yanli | Kong, Zhenkai | Kang, Ying | Zhan, Liang
MnOₓ nanorod catalysts were successfully synthesized by two different preparation methods using porous SiO₂ nanorods as the template and investigated for the low-temperature selective catalytic reduction (SCR) of NO with NH₃. The catalysts were characterized by scanning electron microscopy, transmission electron microscopy, nitrogen adsorption, X-ray diffraction, X-ray photoelectron spectroscopy, and NH₃ temperature-programmed desorption. The results show that the obtained MnOₓ-P nanorod catalyst prepared by redox precipitation method exhibits higher NO removal activity than that prepared by the solvent evaporation method in the low temperature range of 100–180 °C, where about 98% NO conversion is achieved over MnOₓ(0.36)-P nanorods. The reason is mainly attributed to MnOₓ(0.36)-P nanorods possessing unique flower-like morphology and mesoporous structures with high pore volume, which facilitates the exposure of more active sites of MnOₓ and the adsorption of reactant gas molecules. Furthermore, there is a lower crystallinity of MnOₓ, higher percentage of Mn⁴⁺ species and a large amount of strong acid sites on the surface. These factors contribute to the excellent low-temperature SCR activity of MnOₓ(0.36)-P nanorods.
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