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Please use this identifier to cite or link to this item: http://dspace.bits-pilani.ac.in:8080/jspui/handle/123456789/17008
Title: Oxidation of a Pyrophoric Iron Part 1.—Kinetics of Chemisorption of Oxygen on the finely divided Iron-Carbon Substrate
Authors: Galwey, A. K.
Keywords: Chemistry
Oxidation
Kinetic Reaction
Journal of the Chemical Society : Faraday Transaction - I
Issue Date: 1972
Publisher: Journal of the Chemical Society : Faraday Transaction - I. The Chemical Society, London. 1972, 68 (10)
Abstract: A kinetic study of the reaction of oxygen with a finely divided, pyrophoric, iron-carbon mixture is reported. At low pressures (<0.2 Torr) of oxygen, chemisorption proceeded to about two mono- layers. Above 0.8 Torr oxygen uptake corresponded to the formation of about nine monolayers of oxide. From kinetic data, and electron micrographs of the reactant we conclude that the rate limiting processes were: (i) in the low pressure range, intercrystalline diffusion of gas to the active surfaces of the metal, and (ii) in the high pressure range, by diffusion across an oxide barrier layer which covered the metal surfaces. Reactions >0.8 Torr were accompanied by self-heating. The activation energy for both oxygen chemisorption reactions was low (<0.5 kJ mol-1, 77-373 K). The surface oxide layer could be reduced through reaction with constituent carbon by heating at 800 K in vacuum. This ability to regenerate the active surface enabled several successive oxidation reactions to be studied on a particular sample of reactant.
URI: http://dspace.bits-pilani.ac.in:8080/jspui/handle/123456789/17008
Appears in Collections:Journal Articles (before-1995)

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