以臭氧催化氧化與電漿催化系統氧化一氧化氮之效率探討

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Title:	以臭氧催化氧化與電漿催化系統氧化一氧化氮之效率探討
Authors:	林昱衡;Lin, Yu-Heng
Contributors:	環境工程研究所
Keywords:	一氧化氮;臭氧;電漿催化;NO深度氧化;臭氧催化氧化;nitric oxide;ozone;plasma catalysis;NO deep oxidation;ozone catalytic oxidation
Date:	2022-09-29
Issue Date:	2022-10-04 12:26:47 (UTC+8)
Publisher:	國立中央大學
Abstract:	本研究致力於開發低溫高效之一氧化氮氧化技術，並比較電漿催化與臭氧催化氧化兩種控制技術，分別針對流量、反應溫度、氣流組成及觸媒穩定性進行測試，並探討各操作參數對NO氧化效率之影響。本研究使用兩種錳金屬前驅物浸漬於TiO2 (P25)以製備FeMn/TiO2觸媒，分別為硝酸錳與醋酸錳，並比較兩者對觸媒催化活性之影響。電漿催化系統之操作條件為270 ppm NO、氧含量20%、氣體流量1.2 L/min、空間速度15,000 h-1，結果顯示使用FeMn/TiO2 (MA)觸媒展現較佳之NO氧化效率，於SED =520 J/L時NO氧化效率達70±1.2%，然而氣流中含250 ppm SO2時，NO氧化效率下降至53±1.5%。使用臭氧機生成臭氧，於室溫下進行NO深度氧化，系統之操作條件為270 ppm NO、氣體流量2.5 L/min，O3/NO =1時，NO氧化效率達100%，生成212±5.0 ppm NO2，當O3/NO¬ =1.9時可將NO2完全氧化，生成97±3.1 ppm N2O5。臭氧催化氧化系統以FeMn/TiO2 (MA)為觸媒，溫度上升可促進N2O5生成，於反應溫度100℃、空間速度15,000 h-1，O3/NO =1.7時，N2O5濃度由60±4.9 ppm上升至101±5.6 ppm。觸媒之物化特性分析結果顯示FeMn/TiO2 (MA)觸媒具有較高之比表面積及孔體積，分別為47.4 m2/g及0.34 cm3/g，且此觸媒具有高比率之吸附氧(Oα)及Mn3+物種，可提升觸媒之催化活性，進而促進NO之氧化效率。;This study aims to develop a low-temperature, and high-efficiency technology for the oxidation of nitrogen oxide (NOx). Moreover, comparison of the catalyst for plasma catalysis and ozone catalytic oxidation (OZCO) is conducted. FeMn/TiO2 catalysts were prepared through the impregnation of manganese acetate (MA) or manganese nitrate (MN) precursors on TiO2 (P25) and tested for the oxidation of NO. Experimental results indicate that FeMn/TiO2 (MA) catalyst shows higher activities for NO oxidation if compared with FeMn/TiO2 (MN) catalyst. As the inlet NO concentration is controlled at 270 ppm, the NO oxidation efficiency could achieve 70±1.2% at SED =520 J/L. However, existence of SO2 lower the efficiency of NO oxidation. The NO oxidation efficiency dropped to 53±1.5%. The deep oxidation of NO by ozone could achieve 100% efficiency at O3/NO =1 and room temperature, NO2 concentration is measured as 212±5.0 ppm. NO2 is almost completely oxidized at O3/NO =1.9, producing 97±3.1 ppm N2O5. The concentration of N2O5 increased to 101±5.6 ppm as the temperature was increased to 100℃ at O3/NO =1.7 by the OZCO method. Characterization of catalyst indicates that FeMn/TiO2 (MA) catalyst has a higher BET specific surface area and pore volume, which are 47.4 m2/g and 0.34 cm3/g, respectively. Moreover, this catalyst has good oxidation property to promote NO oxidation due to higher Oα/Oβ and Mn3+/Mn4+ ratio.
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