title: Chlorobenzene oxidation using ozone over iron oxide and manganese oxide catalysts.
abstract: A low-temperature catalytic oxidation of chlorobenzene (CB) has been performed at temperatures of 60-210°C using ozone (O(3)) over iron oxide and manganese oxide, respectively. In the absence of ozone, CB conversion achieved with these two catalysts at 200°C was below 10%. However, addition of 1200 ppm 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 manganese oxide (48 kJ mol(-1)) is higher than that of iron oxide (43 kJ mol(-1)) without ozone. However, as ozone is added, the activation energy is significantly reduced to 20.0 kJ mol(-1) for iron oxide. CO and CO(2) 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 amount of reaction byproducts (carboxylic acid species) and residual chloride (MnCl(2)) being deposited on the active sites of the catalysts.
authors.affiliation: Graduate Institute of Environmental Engineering, National Central University, Chung-Li, Taoyuan County 320, Taiwan.
authors.forename: Hou Chuan
authors.initials: HC
authors.lastname: Wang
authors.forename: Hsu Shang
authors.initials: HS
authors.lastname: Liang
authors.forename: Moo Been
authors.initials: MB
authors.lastname: Chang
mesh_terms: D000465:Algorithms; D002384:Catalysis; D002722:Chlorobenzenes / Q000737:chemistry*; D005290:Ferric Compounds / Q000737:chemistry*; D007700:Kinetics; D017895:Manganese Compounds / Q000737:chemistry*; D010083:Oxidants, Photochemical / Q000737:chemistry*; D010084:Oxidation-Reduction; D010087:Oxides / Q000737:chemistry*; D010126:Ozone / Q000737:chemistry*; D013696:Temperature; D014961:X-Ray Diffraction
chemical_list: D002722:Chlorobenzenes; D005290:Ferric Compounds; D017895:Manganese Compounds; D010083:Oxidants, Photochemical; D010087:Oxides; C000499:ferric oxide; C027424:manganese oxide; D010126:Ozone; C031294:chlorobenzene