- 學位論文
應用鉑觸媒結合大氣電漿系統催化分解揮發性有機污染物之研究
Application of Atmospheric Pressure Plasma Jet Assited with Platinum Catalyst for the Treatment of Volatile Organic Compounds
摘要
本研究主要是以大氣電漿束(atmospheric pressure plasma jet, APPJ) 反應器結合鉑觸媒探討揮發性有機物(volatile organic compounds, VOCs)的分解成效。選擇的分解目標為萘(naphthalene, Nap)、氯乙烯(vinyl chloride, VC)及乙烯(ethylene, Eth)。前者為多環芳香碳氫化合物(poly aromatic hydrocarbons, PAHs)中化學結構最簡單且揮發性最高者，故其在氣相PAHs污染物中最具有代表性。Nap溶於正丁醇(n-butanol, BOH)中，通入空氣產生含Nap及BOH之空氣，故n-butanol在系統中的分解效率也一併討論。後二者則為製造聚氯乙烯(polyvinyl chloride, PVC)類塑膠製品的主要原料。Nap為一持久性有機汙染物，具有致癌性及致突變性，亦屬於環境荷爾蒙。VC及乙烯對於生活環境及人體健康將造成危害。故進行該二者之分解反應並做比較。 研究中探討APPJ反應系統中主要參數，如輸入電功率(input power, PWI)、氣體組成、觸媒、及空間流速(space velocity, SV)等與分解效率 (efficiency of decomposition)的關係。本研究所使用的觸媒為Pt/γ-Al2O3，並結合大氣電漿束進行電漿催化氧化分解。結果顯示，僅以大氣電漿束在PWI = 250 W及工作氣體為air，分解效率分別為XVC = XEth = 10%、XBOH = 33%及XNap = 21%。結合觸媒(mS = 10.64 g )後，其分解效率分別增為XVC = 50%、XEth = 78%、XBOH = 99%及XNap = 99% 比較不同觸媒的影響，結果顯示Al2O3、TiO2/Al2O3及Pt/Al2O3三種觸媒在APPJ反應器中，以Pt/Al2O3觸媒具有最高的分解反應能力。當工作氣體為Ar、PWI = 250 W、而SV為17,400 h-1時，其XBOH及XNap皆高於99.9%。此外當Ar系統之PWI = 250 W、SV= 52,100、26,400及17,400 h-1時，其XBOH = 56.1、75.1及96.6%，XNap = 57.0、74.9及98.2%。結果顯示SV降低時(停留時間增長)，其分解效率增高。故結合APPJ與貴金屬氧化觸媒可有效分解正丁醇及萘。
並列摘要
This study investigated the application of atmospheric pressure plasma jet (APPJ) reactor combined with catalyst (catalytic atmospheric pressure plasma jet, CAPPJ) to decompose the volatile organic compounds (VOCs). The target compounds are naphthalene (Nap), vinyl chloride (VC) and ethylene (Eth). The Nap which has the low toxic and high volatility among the poly aromatic hydrocarbons (PAHs). The Nap was mixed with n-butanol (BOH) in gas generator to produce gaseous Nap/BOH. The working gases for generating the plasma in APPJ reactor are Ar, Air and N2. Both Nap and VC are hazardous to human health and exihibit carcinogenicity. Therefore, the decompositions of Nap and VC and their accompanied compounds of BOH and Eth via APPJ reactor were discussed. The effects of system parameters such as the input power (PWI), gas composition, types of catalysts, and space velocity (SV) on the efficiency of decomposition of n-butanol (XBOH) and Nap (XNap) were studied and elucidated. Pt/γ-Al2O3 was used as catalysts in this study and combined with APPJ. The results show that the function of APPJ alone at PI = 250 W and in air gives the efficiencies of decomposition of XVC = XEth = 10%, XBOH = 33% and XNap = 21%, respectively. On the other hand, the efficiencies of decomposition with CAPPJ are XVC = 50%, XEth = 78%, XBOH = 99% and XNap = 99%, respectively. Comparing the catalysts of Al2O3, TiO2/Al2O3 and Pt/Al2O3, the Pt/Al2O3 has the highest reactivity among the three catalysts tested in APPJ system. For the Ar system with the presence of Pt/Al2O3 catalyst at SV of 17,400 h-1 and PWI of 250 W, both XNap and XBOH can reach as high as 99.9%. For the other cases of air/Ar with SV of 52,100, 26,400 and 17,400 h-1, the values of XBOH are 56.1, 75.1 and 96.6%, while those of XNap are 57.0, 74.9, and 98.2%, respectively. Thus, combining the APPJ with Pt/Al2O3 catalyst can effectively decompose both the n-butanol and naphthalene.
參考文獻
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