Transport properties of ammonia in a series of Na+-faujasite zeolites as studied by 2H NMR technique

Frédéric Gilles; Jean Luc Blin; Bao Lian Su

doi:10.1016/j.colsurfa.2004.04.018

Transport properties of ammonia in a series of Na⁺-faujasite zeolites as studied by ²H NMR technique

Frédéric Gilles, Jean Luc Blin, Bao Lian Su

Universite de Namur

Résultats de recherche: Contribution à un journal/une revue › Article › Revue par des pairs

Résumé

The molecular motion of ammonia has been investigated in Na ⁺-faujasite zeolites with various Si/Al ratios from 1.2 to 3.4. ²H NMR spectra show fast isotropic reorientation of the ammonia at room temperature, which indicates the jump of the molecule from one adsorption site to another. A fast rotation around its three-fold axis is observed with decreasing temperature. The correlation time and activation energy values have been determined and reveal a significant decrease in ammonia mobility, with decreasing Si/Al ratio, that has been correlated with the negative charge of the framework oxygen atoms.

langue originale	Anglais
Pages (de - à)	253-256
Nombre de pages	4
journal	Colloids and Surfaces A: Physicochemical and Engineering Aspects
Volume	241
Numéro de publication	1-3
Les DOIs	https://doi.org/10.1016/j.colsurfa.2004.04.018
Etat de la publication	Publié - 14 juil. 2004

Accès au document

10.1016/j.colsurfa.2004.04.018

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Contient cette citation

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title = "Transport properties of ammonia in a series of Na+-faujasite zeolites as studied by 2H NMR technique",

abstract = "The molecular motion of ammonia has been investigated in Na +-faujasite zeolites with various Si/Al ratios from 1.2 to 3.4. 2H NMR spectra show fast isotropic reorientation of the ammonia at room temperature, which indicates the jump of the molecule from one adsorption site to another. A fast rotation around its three-fold axis is observed with decreasing temperature. The correlation time and activation energy values have been determined and reveal a significant decrease in ammonia mobility, with decreasing Si/Al ratio, that has been correlated with the negative charge of the framework oxygen atoms.",

keywords = "H NMR, Ammonia, Diffusion coefficient, Molecular motion, Na-faujasites",

author = "Fr{\'e}d{\'e}ric Gilles and Blin, {Jean Luc} and Su, {Bao Lian}",

year = "2004",

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T1 - Transport properties of ammonia in a series of Na+-faujasite zeolites as studied by 2H NMR technique

AU - Gilles, Frédéric

AU - Blin, Jean Luc

AU - Su, Bao Lian

PY - 2004/7/14

Y1 - 2004/7/14

N2 - The molecular motion of ammonia has been investigated in Na +-faujasite zeolites with various Si/Al ratios from 1.2 to 3.4. 2H NMR spectra show fast isotropic reorientation of the ammonia at room temperature, which indicates the jump of the molecule from one adsorption site to another. A fast rotation around its three-fold axis is observed with decreasing temperature. The correlation time and activation energy values have been determined and reveal a significant decrease in ammonia mobility, with decreasing Si/Al ratio, that has been correlated with the negative charge of the framework oxygen atoms.

AB - The molecular motion of ammonia has been investigated in Na +-faujasite zeolites with various Si/Al ratios from 1.2 to 3.4. 2H NMR spectra show fast isotropic reorientation of the ammonia at room temperature, which indicates the jump of the molecule from one adsorption site to another. A fast rotation around its three-fold axis is observed with decreasing temperature. The correlation time and activation energy values have been determined and reveal a significant decrease in ammonia mobility, with decreasing Si/Al ratio, that has been correlated with the negative charge of the framework oxygen atoms.

KW - H NMR

KW - Ammonia

KW - Diffusion coefficient

KW - Molecular motion

KW - Na-faujasites

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U2 - 10.1016/j.colsurfa.2004.04.018

DO - 10.1016/j.colsurfa.2004.04.018

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SN - 0927-7757

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SP - 253

EP - 256

JO - Colloids and Surfaces A: Physicochemical and Engineering Aspects

JF - Colloids and Surfaces A: Physicochemical and Engineering Aspects

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