JOURNAL of the Tunisian Chemical Society

serving the Research, the Education and the Industry

Co adsorption on iron catalyst: Isotherms and energetics of adsorption

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Adsorption isotherms and isosteric heats of adsorption were measured, at three temperatures in the range 293-373 K, for the interaction of carbon monoxide with a prereduced Fe2O3/Al2O3 catalyst. A decrease in heat of adsorption with increasing surface coverage was observed, and the isotherms conformed well at low coverage to the Freundlich equation, indicating an energetically heterogeneous catalyst surface. Entropy calculations indicate that the surface species are extremely mobile, even at low coverages. Consideration of previous infrared studies of CO adsorption on iron catalyst suggest that the adsorbed layer is entirely of CO-type structure, formed by interaction of CO with surface ionic sites.

H. Batis

Pages 15-20

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