On the interpretation of the NH3-TPD patterns of H-ZSM-5 and H-mordenite

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Abstract

The species obtained from adsorption of ammonia over zeolite H-ZSM-5 and H-mordenite were characterized by temperature-programmed desorption (NH3-TPD) and infrared spectroscopy (IR). At ammonia loadings of NH3/A1 > 1, the IR spectra indicated the formation of NH4+ nNH3 associations, where n ≥ 1. At loadings of NH3/A1 < 1 spectra of NH4+ ions and Lewis-bound NH3 were recorded. The decomposition of the NH4+ ions and desorption of NH3 from strong Lewis acid sites gave rise to TPD peaks above about 673 K. The peaks at temperatures lower than about 673 K were assigned to ammonia released from protonated NH3 associations.

Original languageEnglish
Pages (from-to)293-301
Number of pages9
JournalMicroporous and Mesoporous Materials
Volume47
Issue number2-3
DOIs
Publication statusPublished - Oct 1 2001

Keywords

  • Acidity
  • H-ZSM-5
  • H-mordenite
  • IR spectra of NH
  • NH-TPD

ASJC Scopus subject areas

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

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