The conversion of cyclohexanone catalyzed by Pt/γ-Al 2 O 3 in the presence of H 2 was investigated with a fixed-bed tubular flow reactor at temperatures in the range of 573–673 K, a pressure of 14 bar, and space velocities in the range of 3–120 g of cyclohexanone/(g of catalyst × h). Data determined at low conversions of cyclohexanone identify the kinetically significant reaction classes (hydrogenation, dehydrogenation, hydrodeoxygenation, dehydration, and condensation) and quantitatively represent the initial product distribution. The pseudo-first-order rate constants for formation of the main products of cyclohexanone conversion under initial reaction conditions decrease in the following order: phenol > 2-cyclohexylidenecyclohexan-1-one > 2-methylphenol > cyclohexylbenzene > cyclohexane > biphenyl > 2-cyclohexen-1-one > 2-cyclohexylcyclohexan-1-one > 2-phenylphenol > cyclohexene > 2-cyclohexylphenol. The apparent activation energy for the dehydrogenation reaction that leads to phenol formation is approximately 17 kJ/mol; condensation is the reaction class characterized by the highest apparent activation energy.
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Saidi et al. (2014) studied this question.
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