Abstract
The kinetics of catalytic dehydrogenation of eight secondary alcohols to ketones on a ZnOCr 2O 3 catalyst has been studied in a flow reactor at 360°C and atmospheric pressure. The experimental data were fitted to several kinetic models using a nonlinear least-squares method. The most suitable model was found to be a Langmuir-Hinshelwood-type equation, assuming single-site adsorption of alcohol and surface reaction as the rate-determining step. Reaction rate constants and adsorption coefficients of dehydrogenation of secondary alcohols were correlated by the Taft equation with structural parameters characterizing polar or steric effects of substituents in R 1CH(OH)R 2. Similar data, obtained previously, on nine primary alcohols were included in this correlation. The reaction mechanism is discussed.
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