Stability of platinized alumina catalyst in heptane conversion

Abstract

This article investigates the feasibility of regulating the selectivity of coke formation and the stability of the catalyst in the conversion of n-heptane by varying the hydrogenatingdehydrogenating function of a platinized alumina catalyst by the introduction of various additives. Compounds containing titanium, scandium, lead, cadmium, rhenium, and palladium are used as additives. Catalyst stability is determined from the quantity of aromatics that are formed and the quantity of n-heptane converted during the times required for a 10% drop in the dehydrocyclization rate constant and the overall n-heptane conversion rate constant, respectively, in comparison with the initial rate constants, calculated per unit mass of platinum. It is concluded that it is possible to regulate the selectivity of hydrocarbon conversion catalysts in a medium of hydrogen with respect to carboid formation reactions and for improving the resistance to deactivation due to coking of the surface.