Graduate Institute of Environmental Engineering, National Central University, No.300, Jhongda Rd., Jhongli District, Taoyuan City, 32001, Taiwan.
Green Energy and Environment Institute, Industrial Technology Research Institute, Hsinchu, Taiwan.
Environ Sci Pollut Res Int. 2018 Dec;25(35):35582-35593. doi: 10.1007/s11356-018-3475-z. Epub 2018 Oct 23.
A novel NO storage and reduction (NSR) system is developed for NO removal by integrating Sr-based perovskite catalyst with nonthermal plasma (NTP)-assisted process. In this hybrid system, Sr-based perovskite catalyst is applied for NO adsorption in the lean-burn condition while NTP is used as a desorption-reduction step to convert NO into N under rich-burn condition. Innovative Sr-based perovskites including SrKMnCoO/BaO/AlO (SKMCBA), SrKMnCeO/BaO/AlO (SKMCeBA), and SrKCoNiO/BaO/AlO (SKCNBA) are successfully prepared by impregnation method. Results indicate that SKMCBA possesses the highest NO trapped (214 μmole NO/g) at 400 °C among 3 Sr-based perovskites investigated. High performance of SKMCBA for NO adsorption is mainly attributed to the addition of Mn and Co which own good oxidation ability. Further, SKMCBA is combined with NTP-assisted process for NO reduction. Result indicates that NO conversion achieved with NTP-assisted process reaches 83% with the applied voltage of 18 kV and frequency of 10 kHz in the absence of reducing agent. Additionally, various reducing agents including hydrogen (H), carbon monoxide (CO), and propene (CH) are introduced, individually, into the NTP reduction process, and the results indicate that performance of NSR with NTP can be effectively enhanced. Especially, 100% NO conversion is achieved with H-NTP. This study demonstrates that reduction of NO via NTP-assisted process is promising.
一种新颖的 NO 存储和还原（NSR）系统被开发出来，用于通过将基于 Sr 的钙钛矿催化剂与非热等离子体（NTP）辅助过程集成来去除 NO。在这个混合系统中，基于 Sr 的钙钛矿催化剂在贫燃条件下用于 NO 吸附，而 NTP 用作富燃条件下将 NO 转化为 N 的解吸-还原步骤。通过浸渍法成功制备了创新的 Sr 基钙钛矿，包括 SrKMnCoO/BaO/AlO（SKMCBA）、SrKMnCeO/BaO/AlO（SKMCeBA）和 SrKCoNiO/BaO/AlO（SKCNBA）。结果表明，在所研究的 3 种 Sr 基钙钛矿中，SKMCBA 在 400°C 时具有最高的 NO 捕获量（214 μmole NO/g）。SKMCBA 对 NO 吸附的高性能主要归因于 Mn 和 Co 的添加，它们具有良好的氧化能力。此外，SKMCBA 与 NTP 辅助过程结合用于 NO 还原。结果表明，在没有还原剂的情况下，在 18 kV 的应用电压和 10 kHz 的频率下，NTP 辅助过程实现的 NO 转化率达到 83%。此外，分别将各种还原剂，包括氢气（H）、一氧化碳（CO）和丙烯（CH）引入到 NTP 还原过程中，结果表明，NTP 的 NSR 性能可以得到有效增强。特别是，H-NTP 可实现 100%的 NO 转化率。本研究表明，通过 NTP 辅助过程还原 NO 是有前途的。
