MnOx Catalysts Modified By Nonthermal Plasma For NO Catalytic Oxidation

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• 作者：Xiaolong Tang ; Kai Li ; Honghong Yi ; Ping Ning ; Ying Xiang ; Jiangen Wang ; Chi Wang
• 刊名：The Journal of Physical Chemistry C
• 出版年：2012
• 出版时间：May 10, 2012
• 年：2012
• 卷：116
• 期：18
• 页码：10017-10028
• 全文大小：841K
• 年卷期：v.116,no.18(May 10, 2012)
• ISSN：1932-7455

文摘

Nonthermal plasma modification (NTPM) has been applied to MnOx catalysts for the catalytic oxidation of nitrogen oxide (NO) at low temperature (50鈥?50 掳C), and much higher NO conversion was obtained over the nonthermal plasma-treated catalysts. These modified catalysts were characterized in different ways鈥攕canning electron microscopy (SEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), Brunauer鈥揈mmett鈥揟eller (BET), and Fourier transform infrared (FT-IR)鈥攁nd 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 functional groups on the catalyst鈥檚 surface which contributed to a higher activity for NO catalytic oxidation at low temperature. Our investigation results indicate that nonthermal plasma treatment is an effective way to manipulate catalyst surface properties for NO catalytic oxidation.