Investigation of the Heterogeneous Catalytic Conversion of Cycloalkanes Over Nickel-Alumina / α-Alumina Catalyst Part 1- The Catalytic Dehydrogenation of Cyclohexane PDF

Keywords

catalyst, cyclohexane, flow technique

Abstract

The catalytic conversion of cyclohexane on a Ni-Al2O3, α-Al2O3, catalyst (31.1% of Ni by wt.) was studied using a flow technique. The catalytic activity was measured in the temperature range 400 to 480°C at a space velocity of 9.4-17.8 X10-2 min - I under normal pressure (1 atm). The gaseous and liquid products of the conversion reaction were analysed chromatographically. The gaseous products were hydrogen and methane, and the liquid products were benzene and cyclohexene together with unreacted cyclohexane . The kinetics of the gaseous products and of cyclohexane revealed a zero-order reaction , but that of cyclohexene and benzene did not. The apparent activation energy was found to be 23 .76 ± 0.2 kcal mol-1 independent of the space velocity . The activity and selectivity were discussed referring to the Ni-AI2O3, solid catalyst prepared before (Ni-A).