Abstract
The effects of non-thermal plasma on selective catalytic reduction of NOx by C3H8 (C3H8-SCR) over Co/BEA catalyst were investigated over a wide range of reaction temperatures (473–773 K). The significant synergistic effect between non-thermal plasma and catalytic reduction by C3H8 was exhibited at low temperatures from 473 to 673 K. The synergetic effect diminished with increasing temperature. The NOx removal efficiency of non-thermal plasma facilitated C3H8-SCR hybrid system increased significantly with the increase in NO2/NO ratio from 0.13 to 1.06 when the specific input energy increased from 0 to 136 J L−1. The oxidation performance of NO to NO2 was significantly enhanced by C3H8 in the plasma reactor. Results of CO2/CO ratio and CO2 selectivity suggested that adding non-thermal plasma improved CO2 selectivity of C3H8-SCR. 200 ppm SO2 slightly inhibited NOx conversion of the non-thermal plasma facilitated C3H8-SCR hybrid system at below 673 K, whereas it exhibited no obvious effect at over 673 K. Non-thermal plasma was more selective toward NO oxidation than SO2 oxidation in the presence of C3H8. The non-thermal plasma facilitated C3H8-SCR hybrid system could be used stably in durability tests with several hundreds ppm of SO2.
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Acknowledgments
This work was financially supported by the National Natural Science Foundation of China (Grant No. 21006093) and the Fundamental Research Funds for the Central Universities. This project was also supported by the Foundation of Zhejiang Educational Committee (Grant No. Y200804761) and the Opening Project of the State Key Laboratory of Porous Metal Materials.
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Pan, H., Qiang, Y. Promotion of Non-thermal Plasma on Catalytic Reduction of NOx by C3H8 Over Co/BEA Catalyst at Low Temperature. Plasma Chem Plasma Process 34, 811–824 (2014). https://doi.org/10.1007/s11090-014-9522-8
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DOI: https://doi.org/10.1007/s11090-014-9522-8