Abstract

Nonthermal plasma modification (NTPM) has been applied to MnOx catalysts for the catalytic oxidation of nitrogen oxide (NO) at low temperature (50–250 °C), and much higher NO conversion was obtained over the nonthermal plasma-treated catalysts. These modified catalysts were characterized in different ways—scanning electron microscopy (SEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), Brunauer–Emmett–Teller (BET), and Fourier transform infrared (FT-IR)—and the results can help us to understand the effect of the plasma treatment. The results showed that the surface active sites of these catalysts were enhanced with the treatment of plasma, which improved the dispersion of catalysts. In addition, after NTPM, a considerable amount of deposition with limited depths appeared on the MnOx surface, the average pore size was slightly enlarged, and the pore size distributions of the MnOx became wider. Also, XPS results revealed that the NTPM could increase the oxygen, nitrogen, and kalium functi...

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