The dynamics of ammonia sorption and n-octane hydroconversion over dealuminated ZSM-5 zeolites

G. Onyestyák, J. Valyon, L. V.C. Rees

Research output: Contribution to journalConference article

2 Citations (Scopus)


The dynamics of NH3 sorption of H-ZSM-5 zeolites dealuminated by steaming was examined using the frequency response (FR) method. Two sorption processes with different rates were distinguished: a slower process (process i), related to the formation of NH4+ ions on the Brönsted acid sites, and a faster process (process j) assigned to sorption on Lewis acid sites, which were predominantly, on the NH4+ ions. The ZSM-5 preparations were used as acid supports of Pt-containing bifunctional catalysts that were tested in the hydroconversion of n-octane. Correlations were established between the rate constant of NH3 adsorption (ka(j)) and desorption (kd(j)) and the site-specific hydroconversion activity.

Original languageEnglish
Pages (from-to)123-128
Number of pages6
JournalSolid State Ionics
Publication statusPublished - May 1 2001
Event14th Intenational Symposium on the Reactivity of Solids - Budapest, Hungary
Duration: Aug 27 2000Aug 31 2000



  • Dynamics of NH sorption
  • Frequency response method
  • Octane hydroconversion

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics

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