• C. Otero Areán
  • M. Peñarroya Mentruit
  • M. Rodríguez Delgado
  • G. Turnes Palomino
  • O. V. Manoilova
  • A. A. Tsyganenko
  • E. Garrone

Infrared spectroscopic studies have shown that adsorbed carbon monoxide interacts with Bronsted acid Si(OH)A1 groups of the zeolite H-ZSM-5 forming hydrogen bonded H⋯CO and H⋯OC species, which were characterized by C-O stretching IR absorption bands at 2174 and 2120 cm-1, respectively. In the rubidium-exchanged zeolite, corresponding Rb+⋯CO and Rb+⋯OC adducts gave characteristic bands at 2161 and 2119 cm-1, respectively. Variable-temperature FTIR spectroscopy has shown that, in both cases, C- and O-bonded species are interrelated through a temperature dependent equilibrium in which the proportion of Obonded adducts increases with increasing temperature. By means of van't Hoff plots, the corresponding enthalpy change was found to be ΔH°= 4.6 kJ mol-1 for the CO/H-ZSM-5 system and ΔH°= 1.8 kJ mol-1 for CO/Rb-ZSM-5.

Original languageEnglish
Pages (from-to)207-214
Number of pages8
JournalStudies in Surface Science and Catalysis
Volume142 A
StatePublished - 1 Dec 2002

    Scopus subject areas

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

ID: 41680792