Statistical analysis of Al distributions and metal ion pairing probabilities in zeolites

B. R. Goodman, K. C. Hass, W. F. Schneider, James Adams

Research output: Contribution to journalArticle

41 Scopus citations

Abstract

The distributions of Al tetrahedral sites are studied as a function of Si : Al ratio (from 11 to 95) in three zeolites: ZSM-5, ferrierite, and mordenite. Al configurations obeying Loewenstein's rule are generated by a Monte Carlo procedure and analyzed in terms of accessibility to specific channels. The distribution of pairs of Al sites accessible to the same channel segregates into distinct nearest-neighbor and ring-bridging types. Such pairs provide favorable binding environments for extraframework MOxM2+ cations in the metal-ion-exchanged forms of the zeolites. In all three zeolites, the probability of a given Al site having at least one suitable partner for pairing within 8.5 Å is close to unity for typical Si : Al ratios. The probability at shorter distances is more sensitive to the zeolite structure, reflecting the larger number of highly puckered five-and six-membered rings in ZSM-5. This sensitivity, and its implications for CuOxCu2+ formation in the three Cu-exchanged forms, may explain why Cu-ZSM-5 is the most active of the three for catalytically decomposing NO.

Original languageEnglish (US)
Pages (from-to)85-93
Number of pages9
JournalCatalysis Letters
Volume68
Issue number1-2
DOIs
StatePublished - Aug 2000

Keywords

  • Al pairs
  • Cu oxocations
  • Ferrierite
  • Monte Carlo sampling
  • Mordenite
  • NO decomposition
  • ZSM-5
  • Zeolites

ASJC Scopus subject areas

  • Catalysis
  • Chemistry(all)

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