Chlorobenzene oxidation using ozone over iron oxide and manganese oxide catalysts.pdf

C o H G a A R R 1 A A K I M O C L 1 w n ( w i s o o H a t t m o f b r f o c 0 dJournal of Hazardous Materials 186 (2011) 1781–1787 Contents lists available at ScienceDirect Journal of Hazardous Materials journa l homepage: www.e lsev ier .com/ locate / jhazmat hlorobenzene oxidation using ozone over iron oxide and manganese xide catalysts ou Chuan Wang, Hsu Shang Liang, Moo Been Chang ? raduate Institute of Environmental Engineering, National Central University, Chung-Li, Taoyuan County 320, Taiwan r t i c l e i n f o rticle history: eceived 11 October 2010 eceived in revised form 1 December 2010 ccepted 15 December 2010 vailable online 22 December 2010 a b s t r a c t A low-temperature catalytic oxidation of chlorobenzene (CB) has been performed at temperatures of 60–210 ?C using ozone (O3) over iron oxide and manganese oxide, respectively. In the absence of ozone, CB conversion achievedwith these two catalysts at 200 ?Cwas below10%.However, addition of 1200ppm ozone results in a remarkable increase in CB conversion and the conversion reaches 91.7% at 150 ?C for iron oxide, while 81.5% conversion is achieved with manganese oxide at 90 ?C. The activation energy of ?1 ?1eywords: ron oxide anganese oxide zone manganese oxide (48kJmol ) is higher than that of iron oxide (43kJmol ) without ozone. However, as ozone is added, the activation energy is significantly reduced to 20.0 kJmol?1 for iron oxide. CO and CO2 are the only carbon-containing products detected in the effluent gas stream. For the long-term test, no obvious deactivation was found in iron oxide and ozone. However, in the case of manganese oxide and ozone, 3% reduction of CB conversion was observed. Slight deactivation might be attributed to a small duct catalyhlorobenzene ow-temperature oxidation amount of reaction bypro on the active sites of the . Introduction Incinerationhas becomeoneof themainstream technologies for aste treatment in Taiwan. However, significant amount of chlori- atedvolatile organic c