Springer Science + Business Media;Berlin/Heidelberg: Springer Berlin Heidelberg
摘要:
摘要： A new NO x storage and reduction (NSR) system is developed for NO x removal by combining perovskite-like catalyst with nonthermal plasma technology. In this hybrid system, catalyst is mainly used for oxidizing NO to NO 2 and storing them, while nonthermal plasma is applied as a desorption–reduction step for converting NO x into N 2 . An innovative catalyst with a high NO x storage capacity and good reduction performance is developed by successive impregnation. The catalysts prepared with various metal oxides were investigated for NO x storage capacity (NSC) and NO x conversion. Characterization of the catalysts prepared reveals that addition of cobalt (Co) and potassium (K) considerably increases the performance for NSC. Results also show that SrKMn 0.8 Co 0.2 O 4 supported on BaO/Al 2 O 3 has good NSC (209 μmol/g catalyst ) for the gas stream containing 500 ppm NO and 5 % O 2 with N 2 as carrier gas. For plasma reduction process, NO x conversion achieved with SrKMn 0.8 Co 0.2 O 4 /BaO/Al 2 O 3 reaches 81 % with the applied voltage of 12 kV and frequency of 6 kHz in the absence of reducing agents. The results indicate that performance of plasma reduction process (81 %) is better than that of thermal reduction (64 %). Additionally, mixed gases including 1 % CO, 1 % H 2 and 1 % CH 4 , and 2 % H 2 O (g) are simultaneously introduced into the system to investigate the effect on NSR with plasma system and results indicate that performance of NSR with plasma can be enhanced. Overall, the hybrid system is promising to be applied for removing NO x from gas streams. Graphical abstract ᅟ 其他題名： Environ Sci Pollut Res 其他題名： Environ Sci Pollut Res Int 出版者： Berlin/Heidelberg: Springer Berlin Heidelberg 出版日期： 2016-10-01 出處： Environmental science and pollution research international, 2016-10, Vol.23 (19), p.19590-19601 資源來源： Agricultural & Environmental Science Collection 版權： Springer-Verlag Berlin Heidelberg 2016 識別號： ISSN: 0944-1344 識別號： EISSN: 1614-7499 識別號： DOI: 10.1007/s11356-016-7114-2 識別號： PMID: 27392625
