We found a match
Your institution may have access to this item. Find your institution then sign in to continue.
- Title
Comparison of the Kinetic Behaviors of Fe<sub>2</sub>O<sub>3</sub> Spherical Submicron Clusters and Fe<sub>2</sub>O<sub>3</sub> Fine Powder Catalysts for CO Oxidation.
- Authors
Seung-Gyun Yoo; Jin-Hoon Kim; Un-Ho Kim; Jin-Seung Jung; Sung-Han Lee
- Abstract
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 °C, 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 °C. 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.
- Subjects
GAS chromatography; OXIDATION; SPHERICAL functions; POWDERS; CATALYSTS
- Publication
Bulletin of the Korean Chemical Society, 2014, Vol 35, Issue 5, p1379
- ISSN
0253-2964
- Publication type
Article
- DOI
10.5012/bkcs.2014.35.5.1379