Author(s): E.M. Ezzo, N.A. Yousef and M.A. EI-Kherbawi
Article publication date: 1984-03-01
Vol. 2 No. 1 (yearly), pp. 51-60.
153
Keywords
Catalyst, liquid, kinetics
Abstract
The kinetics of heterogeneous catalytic conversion of cyclohexane (1) andcyelohexene (2) were studied over Pt/AI2O, catalyst (A), using a flow technique under normal pressure. The industrially prepared catalyst was pretreated by air (AI) and/or with hydrogen (AII) at 500 C. The catalytic activity was measured in the temperature range 360-430 C for (1) and 160-260 C for (2) at space velocity 13.70-33.39 x10-2 and 13.17 to 32.10 x10-2 min-1 for (1) and (2), respectively. The gaseous and liquid products of the conversion reaction were analyzed using chromatography. The kinetics of gaseous and liquid products revealed a zero-order reaction in all cases with (1) and (2), respectively. The apparent activation energy was calculated to be 10.1 and 10.6 kcal mol-I for (1) and (2) independent of space velocity. The selectivity and activity of the catalyst vary with the pretreatment conditions and experimental temperature. The gain in the mass of the catalyst after participation in conversion and the formation of products is not a stoichiometric process in case of (AI) and (All) catalyst are explained by polymolecular mechanism.