Hydrogenation of phenol to cyclohexanone has been investigated in the temperature range 160-250-degrees-C on a series of Pd/MgO catalysts. At 160-degrees-C the orders of reaction were found on all catalysts to be about -1 with respect to phenol and about +1 with respect to hydrogen. On the basis of the kinetic results it is suggested that the rate determining step is the surface reaction between phenol and hydrogen adsorbed on the catalyst. An increase in the reaction temperature decreases the rate of reaction. This has been explained through a change of the orders of reaction which increase with temperature. Palladium dispersion does not influence the reaction mechanism. The specific activity was found to be independent of palladium particle size
HYDROGENATION OF PHENOL TO CYCLOHEXANONE OVER PD/MGO
GALVAGNO, Signorino;NERI, Giovanni;
1991-01-01
Abstract
Hydrogenation of phenol to cyclohexanone has been investigated in the temperature range 160-250-degrees-C on a series of Pd/MgO catalysts. At 160-degrees-C the orders of reaction were found on all catalysts to be about -1 with respect to phenol and about +1 with respect to hydrogen. On the basis of the kinetic results it is suggested that the rate determining step is the surface reaction between phenol and hydrogen adsorbed on the catalyst. An increase in the reaction temperature decreases the rate of reaction. This has been explained through a change of the orders of reaction which increase with temperature. Palladium dispersion does not influence the reaction mechanism. The specific activity was found to be independent of palladium particle sizePubblicazioni consigliate
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