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        Application of physical vapor deposition process to modify activated carbon fibers for ozone reduction

        Yu-Chih Lin,Chung-Liang Chang,Tser-Sheng Lin,Hsunling Bai,Ming-Gu Yan,Fu-Hsiang Ko,Chia-Tien Wu,Cheng-Hsiung Huang 한국화학공학회 2008 Korean Journal of Chemical Engineering Vol.25 No.3

        This study utilized the activated carbon fiber (ACF) modified with metal catalyst via physical vapor deposition (PVD) process (ACF/PVD) to diminish ozone. Furthermore, the ozone removal efficiency of ACF/PVD was compared with that of original ACF and ACF modified with metal catalyst via impregnation process (ACF/impregnation). In addition to the kinds of coated metal and the inlet ozone concentrations, the effects of the coating thickness and the reaction temperature on ACF/PVD for ozone removal were also examined. The results indicate that the ozone removal efficiency of ACF/PVD is better than that of original ACF and ACF/impregnation. The ozone removal efficiency of different metal-coated ACF/PVD in the superior order is gold (Au), and manganese (Mn). The increase of Au-coated thickness (3 nm to 80 nm) on ACF/PVD will enhance the ozone removal. However, when the Mn-coated thickness on ACF/PVD is larger than 15 nm, the ozone removal efficiency displays a declining trend. Furthermore, a higher reaction temperature will result in a better ozone removal of ACF/PVD and the original ACF.

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        Classification of particles in particle-laden stream through a stainless steel fibrous filter

        Cheng-Hsiung Huang,Chung-Liang Chang,Tser-Sheng Lin 한국화학공학회 2007 Korean Journal of Chemical Engineering Vol.24 No.3

        investigation experimentally explores the penetration curve of particles shot onto a stainles steelt-ing, on the particle penetration was examined at various flow rates, nozzle diameters and dimensionless particle diam-eters, Sqrt(Stk). The penetration of the flat surface by particles was also determined for comparison. Experimental re-sults demonstrate that oleic acid particles larger than Sqrt(Stk)50 are collected on the stainless steel fibrous filter witha low penetration, while smaller particles stay in the particle-laden stream with high penetration. The penetration ofpotassium chloride particles exceeds that of oleic acid particles, because potassium chloride particles bounce off thestainless steel fibrous filter and the flat surface. Particles bounce of the metal filter less easily than the flat surface.Coating the stainless steel fibrous filter with oil effectively reduces problems of particle bounce. The potasium chlorideparticles sucked the coated oil forming a small mountain on the surface. When the loaded particle mass on the coatedstainless steel fibrous filter ranges between 0.4 and 2.3 mg, Sqrt(Stk)50 is a constant 0.35.

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