A frequency-response study of the kinetics of ammonia sorption in zeolite particles

Gy Onyestyák, J. Valyon, L. V.C. Rees

Research output: Contribution to journalArticle


The dynamic sorption properties of synthetic zeolite NaX and mordenite were studied using the batch-type frequency response (FR) method. FR rate spectra of NH3 sorption were recorded at 200 °C and pressures in the range of 1.0 - 4.0 Torr. The rate of diffusion controlled the rate of mass transport in particles larger than 0.2 mm. Commercial NaX beads, manufactured with binder additive showed higher diffusion resistance than binderless particles of the same zeolite. The rate of the sorption step governed the rate of NH3 transport in powder samples (<0.064-mm sieve fraction). These spectra reflected the energetic heterogeneity of the sorption sites. The FR rate spectra of NH3 sorption were compared for synthetic and natural mordenites.

Original languageEnglish
Pages (from-to)1639-1646
Number of pages8
JournalStudies in Surface Science and Catalysis
Volume142 B
Publication statusPublished - Jan 1 2002


ASJC Scopus subject areas

  • Catalysis
  • Condensed Matter Physics
  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films
  • Materials Chemistry

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