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| Titel: |
OXIDATION OF GLUCOSE ON SUSPENDED PT/C: REACTION KINETICS AND ABSORPTION STUDIES |
| Auteur: |
Alper, E. Wichtendahl, B. Deckwer, W. -D. |
| Verschenen in: |
Chemical engineering communications |
| Paginering: | Jaargang 10 (1981) nr. 6 pagina's 369-387 |
| Jaar: |
1981 |
| Inhoud: |
In search of a suitable model reaction system for studying hydrodynamic properties of slurry reactors under reactive conditions, the oxidation of glucose on a suspended Pt/C catalyst was investigated. In addition to homogeneous kinetic measurements, gas absorption experiments in a stirred cell with a plane interface were also carried out at 25 to 45°C using finely powdered catalyst particles. It was found that the oxygen consumption rale followed first order kinetics only at the very beginning of the reaction. If the total amount of reacted oxygen was considerably more than that of the initial saturation value (i.e. kinetic runs repeated after some time of aeration under vigorous stirring or lengthy gas absorption experiments), the order with respect to oxygen was ½ Furthermore, the half order rate constant dropped to about ½ to ¼ of its initial value and was constant only after an amount of about 1.5 x 10-2mol O2/g catalyst was reacted. A new plot is also proposed which permits the simultaneous determination of the volumetric mass transfer coefficients and the rate constants for a half order reaction from gas absorption experiments at various catalyst concentrations. The rate constants and the kLa values which were obtained from completely different methods were in reasonable agreement. |
| Uitgever: |
Taylor & Francis |
| Bronbestand: |
Elektronische Wetenschappelijke Tijdschriften |
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