| Summary: | 碩士 === 國立臺灣大學 === 環境工程學研究所 === 97 === 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.
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