n-Nonane hydroconversion on Ni and Pt containing HMFI, HMOR and HBEA

Differently prepared Ni and Pt containing HMFI, HMOR and HBEA zeolites for the hydroconversion of n-nonane were studied. The objective was to investig ate the role of acid and metal site density, the influence of the kind of t he metal, and the pore dimension on the activity and selectivity. The react ion rate increased linearly with the number of acid sites, whereas the isom erization selectivity remained constant. The reaction rate and the selectiv ity to isomerization increased first with increasing concentration of metal sites and then remained constant up to 2% Pt content. The reaction rate ra n through a maximum when Ni was used as metal component. To reach the same activity approximately 1.1 wt.% Pt and 10 wt.% Ni were necessary. The selec tivity to isomers was the highest over the BEA samples, whereas the highest activity was found for the MFI samples. (C) 2001 Elsevier Science B.V. All rights reserved.