![]() Wallis AE, Whitehead JC, Zhang K (2007) The removal of dichloromethane from atmospheric pressure air streams using plasma-assisted catalysis. Okumoto M, Kim HH, Takashima K, Katsura S, Mizuno A (2001) Reactivity of methane in nonthermal plasma in the presence of oxygen and inert gases at atmospheric pressure. Kagaku Kogaku Ronbunshu 28(5):522–527įujita T, Hari T, Kojima Y, Matsuda H, Huang L (2005) Influence of O 2 concentration on non-thermal plasma decomposition of halide gases containing Cl and F (in Japanese). Hari T, Nakajo K, Huang L, Kojima Y, Ozawa S, Matsuda H (2002) Influence of the coexistence gas and in-situ solid absorbent on the decomposition of covalent chlorides and fluorides by non-thermal plasma (in Japanese). Oda T, Yamaji K, Takahashi T (2004) Decomposition of dilute trichloroethylene by nonthermal plasma processing-gas flow rate, catalyst, and ozone effect. J Appl Phys 80:4877–4886įitzsimmons C, Ismail F, Whitehead JC, Wilman JJ (2000) The chemistry of dichloromethane destruction in atmospheric-pressure gas streams by a dielectric packed-bed plasma reactor. ![]() Tonkyn RG, Barlow SE, Orlando TM (1996) Destruction of carbon tetrachloride in a dielectric barrier/packed-bed corona reactor. Penetrante BM, Hsiao MC, Bardsley JN, Merritt BT, Vogtlin GE, Wallman PH, Kuthi A, Burkhart CP, Bayless JR (1995) Electron beam and pulsed corona processing of carbon tetrachloride in atmospheric pressure gas streams. Yamamoto T, Ramanathan K, Lawless PA, Ensor DS, Newsome JR, Plaks N, Ramsey GH (1992) Control of volatile organic compounds by an AC energized ferroelectric pellet reactor and a pulsed corona reactor. Ministry of the Environment Government of Japan (2006) Brochure of VOC emission control system (in Japanese) Ministry of the Environment Government of Japan (1997) Environmental quality standards in Japan for benzene, trichloroethylene, tetrachloroethylene and dichloromethane Ministry of the Environment Government of Japan (2008) 2008 PRTR data. From these findings, it was recognized that CH 2Cl 2 was decomposed more effectively without producing unwanted harmful halogenated by-products in the proposed non-thermal plasma reactor where α-Al 2O 3 particles doped with Ca(OH) 2 sorbent were packed. As the solid reaction products, CaClOH and Ca(ClO) 2♴H 2O were detected on Ca(OH) 2 by X-ray diffraction. Moreover, there were no halogenated by-product gases detected in the outlet gas from the reactor. On the other hand, when CH 2Cl 2 was introduced into the plasma reactor where α-Al 2O 3 particles doped with Ca(OH) 2 were packed, the ratio of decomposition of CH 2Cl 2 became higher, compared to the case that α-Al 2O 3 particles were not doped with Ca(OH) 2. The ratio of decomposition of CH 2Cl 2 was almost 100% at 13 kV of electric power and 1 kHz frequency, and CO 2, CH 3Cl, COCl 2, HCl, and Cl 2 were observed as the major reaction products. ![]() As a result, it was recognized that the amount of CH 2Cl 2 decomposed by non-thermal plasma in an α-Al 2O 3 particle bed increased with an increase in plasma input power. In the present study, as the sample of an organic halogenated compound that is most popularly used, we selected dichloromethane (CH 2Cl 2), and 500 ppm of the initial concentration of CH 2Cl 2 was fed into the reactor accompanied by air at a fixed flow rate of 500 × 10 −6 m 3 min −1 at room temperature. A high-voltage and high-frequency pulsed power of −15 to 15 kV and 1 kHz was applied to the wire electrode of the plasma reactor by means of a DC power source. ![]() Further, alkaline sorbent of Ca(OH) 2 was doped onto the surface of α-Al 2O 3 particles, in order to remove halogenated products by in situ absorption with Ca(OH) 2. In the plasma reactor, α-Al 2O 3 particles of 1 and 3 mm (mean particle diameter) were packed as solid dielectric medium to enhance the plasma power density in the reactor. For an effective decomposition and removal of organic halogenated compounds, a packed-bed non-thermal plasma reactor with in situ absorption of the resulting halogenated products by alkaline sorbent incorporated was proposed.
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