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Combining nonthermal plasma with perovskite-like catalyst for NOx storage and reduction

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Abstract

A new NOx storage and reduction (NSR) system is developed for NOx removal by combining perovskite-like catalyst with nonthermal plasma technology. In this hybrid system, catalyst is mainly used for oxidizing NO to NO2 and storing them, while nonthermal plasma is applied as a desorption–reduction step for converting NOx into N2. An innovative catalyst with a high NOx storage capacity and good reduction performance is developed by successive impregnation. The catalysts prepared with various metal oxides were investigated for NOx storage capacity (NSC) and NOx 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 SrKMn0.8Co0.2O4 supported on BaO/Al2O3 has good NSC (209 μmol/gcatalyst) for the gas stream containing 500 ppm NO and 5 % O2 with N2 as carrier gas. For plasma reduction process, NOx conversion achieved with SrKMn0.8Co0.2O4/BaO/Al2O3 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 % H2 and 1 % CH4, and 2 % H2O(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 NOx from gas streams.

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Acknowledgments

The authors would like to express their gratitude to the Ministry of Science and Technology, ROC (Grant No-102WFA0700516), and National Central University for funding.

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Authors and Affiliations

  1. Graduate Institute of Environmental Engineering, National Central University, Chungli, Taiwan

    Han Hsuan Peng, Kuan Lun Pan & Moo Been Chang

  2. Industrial Technology Research Institute, Hsinchu, Taiwan

    Sheng Jen Yu & Shaw Yi Yan

  3. No. 300, Jhongda Rd., Jhongli District, Taoyuan City, 32001, Taiwan

    Moo Been Chang

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  1. Han Hsuan Peng
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  2. Kuan Lun Pan
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  3. Sheng Jen Yu
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  4. Shaw Yi Yan
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Correspondence to Moo Been Chang.

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Responsible editor: Suresh Pillai

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Peng, H.H., Pan, K.L., Yu, S.J. et al. Combining nonthermal plasma with perovskite-like catalyst for NOx storage and reduction. Environ Sci Pollut Res 23, 19590–19601 (2016). https://doi.org/10.1007/s11356-016-7114-2

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  • DOI: https://doi.org/10.1007/s11356-016-7114-2

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