Browsing by Author "Chang, Chung-Liang"

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Application of physical vapor deposition process to modify activated carbon fibers for ozone reduction
(2008-05-01)
Lin, Yu-Chih
;
Chang, Chung-Liang
;
Lin, Tser-Sheng
;
Bai, Hsunling
;
Yan, Ming-Gu
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 rim, 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.
Applying spray pyrolysis to synthesize MnO (x) for decomposing isopropyl alcohol in ozone- and thermal-catalytic oxidation
(2009-07-01)
Chang, Chung-Liang
;
Lin, Yu-Chih
;
Bai, Hsunling
;
Liu, Yu-Huei
;
環境工程研究所
Manganese oxides (MnO (x) ) were prepared by spray pyrolysis methods (Mn (S) ) and calcination at 600 and 1,000 A degrees C (Mn(600) and Mn(1000)) in this study. Further, the efficiencies of oxidizing isopropanol (IPA) by these MnO (x) utilizing ozone (OZCO) and thermal catalytic oxidation (TCO) were compared. The results indicated that Mn (S) , 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 A degrees C for OZCO. The reaction temperature of TCO operated above 270 A degrees C decomposed IPA at the same efficiency.