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Bulletin of the Korean Chemical Society (BKCS)

ISSN 0253-2964(Print)
ISSN 1229-5949(Online)
Volume 35, Number 5
BKCSDE 35(5)
May 20, 2014 

Comparison of the Kinetic Behaviors of Fe2O3 Spherical Submicron Clusters and Fe2O3 Fine Powder Catalysts for CO Oxidation
Seung-Gyun Yoo, Jin-Hoon Kim, Un-Ho Kim, Jin-Seung Jung*, Sung-Han Lee*
Iron oxide clusters, Catalytic oxidation of CO, Kinetics, Inhibition process by CO2
α-Fe2O3 spherical particles having an average diameter of ca. 420 nm and α-Fe2O3 fine particles (< 10 μm particle size) were prepared to examine as catalysts for CO oxidation. Kinetic studies on the catalytic reactions were performed in a flow reactor using an on-line gas chromatography system operated at 1 atm. The apparent activation energies and the partial orders with respect to CO and O2 were determined from the rates of CO disappearance in the reaction stage showing a constant catalytic activity. In the temperature range of 150-275 oC, the apparent activation energies were calculated to be 13.7 kcal/mol on the α-Fe2O3 spherical submicron clusters and 15.0 kcal/mol on the α-Fe2O3 fine powder. The Pco and Po2 dependencies of rate were investigated at various partial pressures of CO and O2 at 250 oC. Zero-order kinetics were observed for O2 on both the catalysts, but the reaction order for CO was observed as first-order on the α-Fe2O3 fine powder and 0.75-order on the α-Fe2O3 spherical submicron clusters. The catalytic processes including the inhibition process by CO2 on the α-Fe2O3 spherical submicron powder are discussed according to the kinetic results. The catalysts were characterized using XRD (X-ray powder diffraction), FE-SEM (field emission-scanning electron microscopy), HR-TEM (high resolution-transmission electron microscopy), and N2 sorption measurements.
1379 - 1384
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