Dynamic behaviour of triethylamine molecules adsorbed in aluminophosphate (AlPO4-5) and silicoaluminophosphate (SAPO-5) molecular sieves

Kazuma Gotoh, Shin'ichi Ishimaru, Ryuichi Ikeda

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

1H NMR spectra, second moments of line and spin-lattice relaxation times were measured for triethylamine (TEA) adsorbed in aluminophosphate (AlPO4-5) and silicoaluminophosphate (SAPO-5) molecular sieves in the temperature range 90 K to room temperature. Two modes of motions, molecular reorientations about the pseudo-C3 axis and the isotropic rotation were observed in both systems. The fact that the former motion in SAPO-5 is hindered more than in AlPO4-5 was attributed to the hydrogen-bond formation between Bronsted acid sites and lone-pair electrons in TEA. This difference in interaction was shown to be the origin of the distribution of the motional correlation time (τ) in SAPO-5 less than in AlPO4-5 in which the presence of molecular C3 axes in micropores oriented more randomly than in SAPO-5 result in a marked τ distribution.

Original languageEnglish
Pages (from-to)1865-1869
Number of pages5
JournalPhysical Chemistry Chemical Physics
Volume2
Issue number8
DOIs
Publication statusPublished - Apr 15 2000
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy(all)
  • Physical and Theoretical Chemistry

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