A DRIFT spectroscopic study of the N2 adsorption and acidic properties of H- and Pt/H-zeolites

F. Lónyi, A. Kovács, J. Valyon

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Abstract

The N2 adsorption on zeolite H- and Pt/H-mordenite and Beta (Pt/AlF=0.04-0.08) was studied by DRIFT spectroscopy at room temperature and 1 to 9 bar N2 pressures. The H-bonding of N 2 to the OH groups induced shift of the νOH band to lower frequencies. The ΔνOH shift was taken as a measure of the intrinsic acid strength of the sorption site hydroxyl groups. Results suggested that the intrinsic Brønsted acidity of the H- and the Pt,H-forms were about the same regardless of the amount and oxidation state of the Pt in the sample. In the spectrum of the H2-reduced Pt,H-mordenite, having relatively high Pt content (>1.5 wt%), as a new spectral feature, a νNN absorption band appeared at ∼2232-2245 cm-1. The band was attributed to the νNN vibration of nitrogen, bound to relatively large Pt-clusters. This assignment was supported by the results of the DRIFT examination of the adsorbed CO.

Original languageEnglish
Pages (from-to)869-876
Number of pages8
JournalStudies in Surface Science and Catalysis
Volume158 A
Publication statusPublished - Jan 1 2005

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ASJC Scopus subject areas

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

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