Combining catalysis and non-thermal plasma over a perovskite-like catalyst for NOx storage and reduction

• Main Authors: Han-Hsuan Peng, 彭瀚萱
• Other Authors: Moo-been Chang
• Format: Others
• Language: zh-TW
• Published: 2015
• Online Access: http://ndltd.ncl.edu.tw/handle/11518483062229173654

碩士 === 國立中央大學 === 環境工程研究所 === 103 === Lean-burn engine is a promising technology due to its high efficiency, reliability and durability. However, more nitrogen oxides (NOx) are formed under lean-burn condition. NOx not only causes various adverse effects such as acid rain, photochemical smog, deterioration of water quality and visibility, but also harms human health. Hence, how to effectively reduce NOx emissions at a reasonable cost has become an emerging issue. Several methods have been developed for NOx removal, such as direct decomposition, selective catalytic reduction (SCR), and selection non-catalytic reduction (SNCR). In this study, a new NOx storage and reduction (NSR) system is developed for NOx removal by combining catalyst and non-thermal plasma technology (DBD). In this hybrid system, catalyst is mainly used for oxidizing NO to NO2 and storing them on the surface, while non-thermal plasma is applied as a desorption/ reduction step for converting NO2 into N2. Previous study indicates that the amount of stored NOx is the rate-limiting step for the NSR system. The catalyst with a high NOx storage capacity and good reduction performance need to be developed. In this study, SrKMn0.8Co0.2O4 is supported on BaO/Al2O3 to prepare the catalyst. The adsorption experiment was conducted with the gas stream containing 500 ppm NO and 5% O2 with N2 as carrier gas. The results indicate that NOx is effectively adsorbed on the catalyst and converted to N2 at room temperature by applying non-thermal plasma catalysis (η = 80%) and adding appropriate reducing agent can improve it to 84%. The results show that this hybrid system is promising in removing NOx from gas streams.