Abstract
Effects of nonthermal plasma (NTP) on the selective catalytic reduction of NO x by C3H8 (C3H8-SCR) over Co–In/zeolites were investigated in the presence of SO2 and H2O at low temperatures (<below 648 K). Co–In/H-(Beta/USY) displayed the highest low-temperature activity in the NTP-facilitated C3H8-SCR (PF-C3H8-SCR) hybrid system because of the enhancement of chemisorbed oxygen, acid sites, and weak adsorption species (NO2 − and NO x ) on Co–In/H-(Beta/USY). The assistance of NTP significantly promoted the tolerance of SO2 and H2O on both Co–In/H-Beta and Co–In/H-(Beta/USY) in C3H8-SCR reaction. Co–In/H-(Beta/USY) even exhibited excellent SO2 tolerance in the PF-C3H8-SCR hybrid system when a relatively high concentration of SO2 (1000–2000 ppm) and 7 % H2O were introduced into the feed gas. Sulfate species formed on the active sites of Co–In/H-(Beta/USY) were unstable because of the relatively low-temperature (below 600 K) desorption of sulfate species. The unstable sulfate species contributed slight inhibition to C3H8 activation and nitrogen-containing formation on the active sites of Co–In/H-(Beta/USY) in the PF-C3H8-SCR hybrid system. The PF-C3H8-SCR hybrid system with Co–In/H-(Beta/USY) may be a potential candidate for DeNO x industrial applications.
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Acknowledgments
This work was financially supported by the National Natural Science Foundation of China (No. 21006093) and Natural Science Basic Research Plan in Shaanxi Province of China (No. 2014JQ2-2009). This project was also supported by the Guangxi Education Department Project (2013YB111) and the Fundamental Research Funds for the Central Universities.
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Pan, H., Su, Q., Wei, J. et al. Promotion of Nonthermal Plasma on the SO2 and H2O Tolerance of Co–In/Zeolites for the Catalytic Reduction of NO x by C3H8 at Low Temperature. Plasma Chem Plasma Process 35, 831–844 (2015). https://doi.org/10.1007/s11090-015-9633-x
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DOI: https://doi.org/10.1007/s11090-015-9633-x