Kinetics of cyclohexene hydrogenation and of thiophene hydrogenolysis over cobalt-molybdenum catalysts of different composition

Abstract

The kinetics of the title reactions has been measured at 350°C and atmospheric pressure on six Co-Mo-AL 2 O 3 catalysts prepared by successive impregnation of the support with solutions of molybdenum and cobalt salts and containing these components in different ratios as well as on a commercial Cherox 36-00 catalyst. The activity of these catalysts depend strongly on their composition and showed similar trends for both reactions. Kinetic data were correlated by equations of Langmuir-Hishelwood type. Their adsorption coefficients have a similar value for different catalysts and all differences in the activity reflected in rate constants. Surface concentrations of molybdenum were determined by low temperature oxygen adsorption and were correlated with experimental rate constants.