Kinetics of 2-methylpentane catalytic transformations over Pt/Na-β zeolite

Kinetic studies of 2-methylpentane skeletal transformations over Pt/Na-beta zeolite have been carried out under steady state conditions. Negative reaction orders versus hydrogen, and positive reaction orders versus 2-methylpentane were obtained, In order to explain these kinetic data several mechanistic models based on ideas of multiple adsorption for the organic reactant and competition in adsorption were tested against experimental data. The best description for 2-methylpentane consumption rate was achieved applying a reactive (associative) chemisorption mechanism. Selectivity towards the main reaction product 3-methylpentane was seen to be dependent on reaction pressure. In the mechanistic model we propose an involvement of at least two different types of mechanism with different modes of adsorbed,2-methylpentane, more precisely with different number of adsorption sites. Comparison between experimental and calculated values was performed through statistical data fitting. Good description has been achieved. (C) 1999 Elsevier Science B,V, All rights reserved.