Investigation of the Heterogeneous Catalytic Conversion of Cycloalkanes on Ni-Al2O3/α-Al2O3 Catalyst Part II. The Disproportionation of Cyclohexene PDF

Keywords

catalyst, cyclohexene, heterogeneous

Abstract

In a previous study (Ali and Mazhar 1991) the kinetics of the heterogeneous catalytic conversion of cyclohexane was studied on Ni-Al2O3/α-Al2O3 catalyst in flow system under normal pressure. Owing to the different products obtained and to the increase in the mass of the catalyst the polymolecular mechanism was suggested, and the catalytic activity was found to improve on supporting the impregnated nickel alumina on α- alumina. Among the obtained products was cyclohexene, it seemed of interest to study the kinetics of the heterogeneous conversion of cyclohexene on the same catalyst, under the same experimental conditions. The study revealed that the conversion of cyclohexene is a zero-order reaction and that the apparent activation energy for the reaction has a value of 18.4 kcal mol·1. The effects of pretreatment conditions and of the nature of the catalyst on the conversion were studied. The polymolecular mechanism was suggested for the conversion of cyc10hexene over Ni-NA catalyst under our experimental conditions