Symposium on application of pulse techniques to kinetic measurements: Influence of cycling on the rate of oxidation of SO2 over a vanadia catalyst


  • Selected paper from the sympoeium organized by the Catalysis Division of the Chemical Institute of Canada, and presented at the 66th Csnmdtn Chemical Conference and Exhibition, Montreal, Quebec, June 8-6, 187% Symposium chairman: Dr. P. L. Silvestan. University of Waterloo, Waterloo. Ontario.

  • Data given in the figurea is available at a nominal charge. from the De∼mitory of Unpublished Data. National Science Library. National Rueareb Council of Caamda. Ottawa. Ontario KIA 082.


Feed composition cycling of the catalytic oxidation of SO2 to SO3 in an isothermal, differential reactor was studied using an industrial vanadia catalyst. Reaction was carried out at 405°C using square-wave cycles of SO2, O2 and N2 at pressures close to atmospheric and at constant total molar flow through the reactor. Significant increases were found in the rate of oxidation of SO2 over steady-state values, depending upon the choice of both amplitude and period.

Some preliminary interpretation of these results is provided.


On a fait une étude du cyclage de la composition qui entre dans un réacteur différentiel et isothermique où se passe l'oxydation de SO2 à SO3 en utilisant un catalyseur industriel à base d'oxyde de vanadium. La réaction s'est faite à 405°C en utilisant des cycles à ondes carrées de SO2, d'O2, et de N2 et des pressions à-peu-près atmosphériques et des courants constants à travers du réacteur.

On présente quelques interprétations préliminaires de ces résultats.