Intrinsic catalytic cracking activity of hexane over H-ZSM-5, H-beta and H-Y zeolites Academic Article uri icon


  • Mono- and bimolecular intrinsic rate constants for the conversion of n-hexane over H-Y, H-ZSM-5, and H- zeolites were measured at 623 K by combining conventional catalytic techniques with gravimetric adsorption measurements. Since H-zeolites are catalytically active, their adsorption properties under reaction conditions could not be directly obtained. Rather, adsorption experiments were carried out on the H-zeolites at temperatures below the onset of catalytic activity (450-530 K). Thermodynamic adsorption constants for the H forms at 623 K were then obtained by extrapolation. In addition, the catalytically inactive Na forms were chosen to characterize the overall temperature dependence of n-hexane adsorption on ZSM-5, Y, and zeolites in the range 450-623 K. For the cracking experiments, monomolecular conditions were ensured by choosing a low hexane pressure (<0.57 kPa) and short contact times. The intrinsic activity for mono- and bimolecular n-hexane cracking over the zeolites, after taking into account the amounts of adsorbed hydrocarbon, was in the order H-ZSM-5 > H- > dealuminated H-Y H-Y. 1999 American Chemical Society.

published proceedings


author list (cited authors)

  • Kotrel, S., Rosynek, M. P., & Lunsford, J. H.

citation count

  • 66

complete list of authors

  • Kotrel, S||Rosynek, MP||Lunsford, JH

publication date

  • February 1999