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Chung-Liang Chang,Hsunling Bai,Yu-Huei Liu,Yu-Chih Lin 한국화학공학회 2009 Korean Journal of Chemical Engineering Vol.26 No.4
Manganese oxides (MnOx) were prepared by spray pyrolysis methods (MnS) and calcination at 600 and 1,000℃ (Mn600 and Mn1000) in this study. Further, the efficiencies of oxidizing isopropanol (IPA) by these MnOx utilizing ozone (OZCO) and thermal catalytic oxidation (TCO) were compared. The results indicated that MnS, which are characterized by larger surface areas, processed gas hourly space velocity of 42,000 h−1 and inlet IPA concentration of 400 ppm performing IPA decomposition efficiencies approaching 100%, and the reaction temperature was operated at only 85℃ for OZCO. The reaction temperature of TCO operated above 270℃ decomposed IPA at the same efficiency.
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.