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The kinetics and mechanism of the oxidation of carbon monoxide over an industrial vanadium oxide catalyst

1975; Wiley; Volume: 53; Issue: 4 Linguagem: Inglês

10.1002/cjce.5450530414

1939-019X

R. F. Mann, D. Tycholiz, A. Stanislaus,

Catalysis and Hydrodesulfurization Studies

Abstract The rate of catalytic oxidation of carbon monoxide was studied in a fixed bed reactor over the following range of conditions: 325 to 396°C, 0.11 to 1.75 mole % oxygen, 9.50 to 10.20 mole % carbon monoxide. Oxygen was the limiting component, most of the runs were taken to greater than 10% oxygen conversions, and therefore an integral approach was taken in the data analysis. The catalyst was vanadium oxide/potassium sulfate on silica, an industrial preparation which had been used in previous kinetic studies. The data were correlated successfully by the steady state adsorption model with Arrhenius activation energies of 22.1 k.cal/g. mole for the oxygen chemisorption step and 18.0 k.cal/g. mole for the reaction step. The rate constants obtained provide further support for the steady state adsorption model, previously used to evaluate the oxidation kinetics of naphthalene, toluene, benzene and orthoxylene on the same catalyst. The integrated rate equation appears to well describe the relationship between the various parameters with the conversion of the limiting component varying from less than 5% to over 50%. A brief comparison is reported between the steady state adsorption model and the more complex triangular mechanism postulated by Hirota and co‐workers.