Journal
PLASMA CHEMISTRY AND PLASMA PROCESSING
Volume 34, Issue 4, Pages 811-824Publisher
SPRINGER
DOI: 10.1007/s11090-014-9522-8
Keywords
Non-thermal plasma; C3H8-SCR; Co/BEA; NO oxidation; Sulfur tolerance
Funding
- National Natural Science Foundation of China [21006093]
- Fundamental Research Funds for the Central Universities
- Foundation of Zhejiang Educational Committee [Y200804761]
- State Key Laboratory of Porous Metal Materials
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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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