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Kinetics of oxygen exchange between CO2 and CO on carbon

✍ Scribed by M. Mentser; S. Ergun

Publisher
Elsevier Science
Year
1967
Tongue
English
Weight
602 KB
Volume
5
Category
Article
ISSN
0008-6223

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✦ Synopsis

A study was made of the reversible exchange of oxygen between CO a and CO on a carbon kl surface, CO 2+ CfeCO+ Co, at 750"-850°C and atmospheric pressure with carbon-14 used as a tracer. At these temperatures the rates of exchange were a few orders of magnitude greater than the rates of gasification, i.e. transfer of carbon from solid to gas phase. Activation energies for the forward and backward reactions were 53 and 36 kcal/mole respectively. Direct determination of the equilibrium constant of the oxygen exchange reaction made in this study agreed well with indirect determinations made earlier. Thus oxygen exchange was established as an authentic and important step in the reaction sequence for the carbon dioxide-carbon reaction. The results showed further that oxygen exchange is not likely to become the rate-controlling step at higher temperatures, and that the retarding effect of CO on gasification rates should diminish with increasing temperature.

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