結合鈣鈦礦型觸媒及非熱電漿技術去除氣流中酚之研究

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題名:	結合鈣鈦礦型觸媒及非熱電漿技術去除氣流中酚之研究
作者:	陳岱羚;Chen,Dai-Ling
貢獻者:	環境工程研究所
關鍵詞:	揮發性有機物;酚;非熱電漿技術;Perovskite型觸媒;單階段電漿結合觸媒系統;Volatile Organic Compounds;Phenol;Non-thermal plasma;Perovskite-type catalyst;Single-stage plasma catalysis
日期:	2015-08-25
上傳時間:	2015-09-23 15:30:11 (UTC+8)
出版者:	國立中央大學
摘要:	揮發性有機化合物之排放已受到公眾越來越多的關注，因為揮發性有機化合物之排放對人體與環境會造成不利的危害，其中酚是重要的揮發性有機化合物，它在低濃度是具有毒性的，透過吸入、攝取及眼睛或皮膚的接觸都會對人類健康造成不良的影響，此外，酚也是重要的臭味物質，因此如何有效控制其排放實刻不容緩。本研究以perovskite型觸媒結合非熱電漿技術去除氣流中揮發性有機物，藉由上述之實驗來探討電漿與催化反應間之加成效應。本研究分為兩個部份進行討論，第一部份以檸檬酸溶膠凝膠法合成perovskite型觸媒LaMnO3，藉Sr及Cu的添加來製備改質之LaMnO3觸媒，並比較LaMnO3、La0.8Sr0.2MnO3及La0.8Sr0.2Mn0.8Cu0.2O3三種觸媒之催化活性及基本特性探討。研究結果顯示La0.8Sr0.2Mn0.8Cu0.2O3於200oC即可達到100%之去除效率且在300oC對酚之礦化率已達100%，而La0.8Sr0.2MnO3及LaMnO3則需於300oC及400oC才可達完全去除之效率。從觸媒之測試結果顯示改質之La0.8Sr0.2Mn0.8Cu0.2O3對酚之去除具有最佳活性。第二部份以非熱電漿及電漿觸媒系統去除酚，結果顯示在電壓為16 kV、頻率為8 kHz及總流率為300 mL/min之條件下，非熱電漿系統對於酚之去除率為80%，填充La0.8Sr0.2Mn0.8Cu0.2O3觸媒於非熱電漿系統中酚之去除效率達100%；礦化率則從11%上至55%提升了44%；能量效率方面，單階段電漿結合觸媒系統顯著高於單獨非熱電漿系統。整體而言，單階段電漿結合觸媒系統是有效提升非熱電漿處理氣流中酚之能量效率以及礦化率。;Emission of volatile organic compounds (VOCs) into atmosphere has received increasing public concern due to their adverse effects on human health and the environment. Phenol (C6H5OH) is one of the most important VOCs. It is toxic even at a low concentration, causing adverse effect on human health through inhalation, ingestion, or eye and skin contact. Additionally, it is also an important odor-causing substance and how to effectively control its emission remains a big challenge. This study aims to combine perovskite catalyst and non-thermal plasma in removing phenol from gas streams. Moreover, possible synergism caused by catalysis and plasma for VOCs removal is also investigated. The study is divided into two parts for discussion, the first part is the preparation of perovskite-type catalyst by citric acid method. LaMnO3 catalyst is substituted by Sr and Cu elements, and the catalytic activity and fundamental characteristics of the three catalysts including LaMnO3, La0.8Sr0.2MnO3 and La0.8Sr0.2Mn0.8Cu0.2O3 are compared. The results show that phenol removal efficiency achieved with La0.8Sr0.2Mn0.8Cu0.2O3 is up to 100% at the operating temperature of 200oC and the mineralization rate at 300oC is up to 100%, while the phenol removal efficiencies achieved with La0.8Sr0.2MnO3 and LaMnO3 are up to 100% at the operating temperature of 300oC and 400oC, respectively. The results show that La0.8Sr0.2Mn0.8Cu0.2O3 has the best activity of removal of phenol. Non-thermal plasma and combined plasma catalysis (CPC) are also applied to remove phenol from gas streams. The results show that with the condition of applied voltage of 16 kV, frequency of 8 kHz and flow rate of 300 mL/min, the phenol removal efficiency achieved with non-thermal plasma is 80%, and the phenol removal efficiency achieved with the combined plasma catalysis by filling La0.8Sr0.2Mn0.8Cu0.2O3 is up to 100%. Mineralization rate is improved by 44% as CPC is applied. For energy efficiency, the single-stage plasma catalysis is better than non-thermal plasma alone. Overall, the combined plasma catalysis is effective in enhancing the energy efficiency and mineralization rate of removing phenol from gas streams.
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