Dynamic behaviour of triethylamine molecules adsorbed in aluminophosphate (AlPO4-5) and silicoaluminophosphate (SAPO-5) molecular sieves
Literature Information
Kazuma Gotoh, Shin'ichi Ishimaru, Ryuichi Ikeda
1 H 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 Brönsted 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.
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