Variable temperature 129Xe NMR studies of xenon adsorbed on mesoporous MCM-41 molecular sieves

Sung Jeng Jong, Jin Fu Wu, Ajit R. Pradhan, Hong Ping Lin, Chung Yuan Mou, Shang Bin Liu

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7 Citations (Scopus)

Abstract

A comprehensive variable temperature 129Xe NMR study of xenon adsorbed on mesoporous MCM-41 molecular sieves with varied pore sizes, morphology and aluminum concentration has been made. The observed 1Xe NMR chemical shifts (8) of the adsorbed Xe exhibit a strong dependent on Xe loading (ρ) and temperature (T). At low Xe loading, the 129Xe chemical shifts show a concave upward dependence on Xe density which vary with temperature and pore size of the adsorbent. Whereas at high loading, a nearly linear relation between the observed chemical shifts and effective Xe density was found whose slopes of δ vs ρeff is temperature dependent. Regressional fitting based on a two-site exchange model enable us to fit the observed δ(T, ρ) data in a least squares sense to second-order polynomial with ρ. The temperature variations of the Xe-wall interaction at zero density as well as the Xe-Xe interactions were derived explicitly and compared with the results available for bulk Xe, Xe adsorbed on microporous materials and on polymer surfaces.

Original languageEnglish
Pages (from-to)543-550
Number of pages8
JournalStudies in Surface Science and Catalysis
Volume117
DOIs
Publication statusPublished - 1998

All Science Journal Classification (ASJC) codes

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

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