KAGAKU KOGAKU RONBUNSHU
Online ISSN : 1349-9203
Print ISSN : 0386-216X
ISSN-L : 0386-216X
Catalysis, Kinetics and Reactor Design
Effect of Oxygen Concentration on Supercritical Water Oxidation of Glucose
Masahiro ShishidoKeisuke OkuboMotofumi Saisu
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2001 Volume 27 Issue 6 Pages 806-811

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Abstract

In supercritical water oxidation of glucose, the effect of oxygen concentration on the productionrate of gaseous components (CO, C02, H2 and CH4) was examined at 400-470°C and 18.5, 25..5 MPa withresidence times of less than 30 sec in a flow-type reactor. Hydrogen peroxide was used as an oxidant.Oxygen was produced by hydrogen peroxide decomposition. Oxygen concentration was varied from 50to 250% compared with nominal stoichiometric oxygen concentration. The experimental resultsrevealed that the oxygen concentration did not signtficantly influence the yields of gaseous components,and that the amounts of gaseous products increased with residence time up to 5 sec and then reached aplateau. Apparent rate analysis was carried out based on the assumption that the overall production rateof carbon-containing gaseous speacies is proportional to glucose concentration. The result suggests thatthe initial stage of oxidation up to 5 sec of residence time was described by first-order kinetics. AnArrhenius plot of the obtained apparent first-order rate constant showed that the ratio of frequencyfactors for oxygen concentrations of 100 and 200% was almost equivalent to the oxygen concentration ratio.

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© 2001 by THE SOCIETY OF CHEMICAL ENGINEERS, JAPAN
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