以臭氧催化氧化法去除甲醛及多環芳香烴之效率探討;Removal of Formaldehyde and Polycyclic Aromatic Hydrocarbons via Ozone Catalytic Oxidation

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题名:	以臭氧催化氧化法去除甲醛及多環芳香烴之效率探討;Removal of Formaldehyde and Polycyclic Aromatic Hydrocarbons via Ozone Catalytic Oxidation
作者:	黃有猷;Huang, Yu-You
贡献者:	環境工程研究所
关键词:	甲醛;臭氧催化氧化系統;多環芳香烴;Perovskite-type觸媒;Formaldehyde;Polycyclic Aromatic Hydrocarbons (PAHs);Ozone catalytic oxidation (OZCO);Perovskite-type catalyst
日期:	2022-09-30
上传时间:	2022-10-04 12:26:50 (UTC+8)
出版者:	國立中央大學
摘要:	近年來國民生活水準日益提高，民眾對周邊生活環境品質要求也日益提升，全國各環保局接獲陳情案件中餐飲業油煙異味陳情數量大幅增加，值得重視。本研究以LaMnO3 (LMO)為基礎，開發新穎之double perovskite觸媒，包括LaFe1-xMnxO3 (x=0.5)及LaNi1-xMnxO3 (x=0.5) (LFMO、LNMO)，並結合臭氧催化氧化技術 (Ozone catalytic oxidation, OZCO)以去除氣流中之甲醛(Formaldehyde, HCHO)及多環芳香烴(polycyclic aromatic hydrocarbons, PAHs)兩種污染物。本研究主要分為兩大方向，一為LFMO與LNMO應用於催化氧化系統，以不同溫度區間及系統氧含量變化，比較催化表現之差異，找出最佳參數結合OZCO系統以改善甲醛之去除效率；二為進行SCR觸媒與LMO觸媒對蒽(Ant)之去除效率比較，並探討結合OZCO系統對蒽之去除效率，結果顯示LNMO及LFMO觸媒催化表現優於傳統Perovskite-type觸媒，且經由26 hr觸媒長效性測試得知兩觸媒皆有良好穩定性，此外觸媒特性分析結果指出LFMO及LNMO觸媒擁有相較於其它文獻較高之Perovskite-type觸媒比表面積及氧空位，且兩觸媒皆擁有緊密質地及高反應之活性位點；另外將LNMO及LFMO觸媒結合OZCO系統去除甲醛，結果顯示於100℃，兩觸媒皆有良好之甲醛轉化效率，而後進行8 hr長效性測試結果表明LFMO觸媒穩定性比LNMO佳，未來可進一步改良開發並應用於實場。另外將LMO觸媒與SCR觸媒進行蒽降解效率之比較，結果顯示LMO觸媒擁有最佳去除效率(達89%)，且LMO對蒽無吸附效應存在，處理後毒性當量也比SCR觸媒低，故Perovskite-type觸媒可進一步針對PAHs降解進行開發。 ;During the past decades, emission of formaldehyde (HCHO) and polycyclic aromatic hydrocarbons (PAHs) from anthropogenic sources including industries, transportation and indoor has greatly increased and has caused devastating impact on atmosphere. This work aims to develop a high-efficiency catalyst for degradation of HCHO and anthracene (Ant) with ozone catalytic oxidation (OZCO). Perovskite-type catalysts have two advantages of high thermal stability and oxygen mobility and are widely applied in the field of air pollution control. In this study, a series of B-site partially substituted perovskites LaB’xMn1-xO3 (B =Fe,Ni) (x=0.5) were prepared and compared with conventional perovskites (LNO, LFO and LMO) for HCHO removal activities. The results indicate that the catalytic performances of LFMO and LNMO are superior to LNO, LFO and LMO. In addition, LFMO and LNMO have good stability through 26 hr on stream test. In comparison with previous studies, LFMO and LNMO have higher specific surface areas and oxygen vacancies, and both catalysts are of compact texture and highly reactive active sites. Moreover, as OZCO is combined with LFMO or LNMO reveal optimal catalytic performance at 100℃. However, the stability of LFMO is better than that of LNMO and they can be further improved for real application. Finally, SCR is compared with LMO for degradation of Ant. The results show that the LMO has a high Ant removal efficiency (89%). In addition, Ant is not adsorbed on the catalyst, indicating the LMO catalyst has a good potential for reducing PAHs emission.
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