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

University of Namur

Research output: Contribution to journal › Article › peer-review

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.

Original language	English
Pages (from-to)	253-256
Number of pages	4
Journal	Colloids and Surfaces A: Physicochemical and Engineering Aspects
Volume	241
Issue number	1-3
DOIs	https://doi.org/10.1016/j.colsurfa.2004.04.018
Publication status	Published - 14 Jul 2004

Keywords

H NMR
Ammonia
Diffusion coefficient
Molecular motion
Na-faujasites

Access to Document

10.1016/j.colsurfa.2004.04.018

Cite this

@article{07e56e9a857b4e8ea7af187e94b60e6d,

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",

month = jul,

day = "14",

doi = "10.1016/j.colsurfa.2004.04.018",

language = "English",

volume = "241",

pages = "253--256",

journal = "Colloids and Surfaces A: Physicochemical and Engineering Aspects ",

issn = "0927-7757",

publisher = "Elsevier",

number = "1-3",

}

TY - JOUR

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

UR - http://www.scopus.com/inward/record.url?scp=4143110492&partnerID=8YFLogxK

U2 - 10.1016/j.colsurfa.2004.04.018

DO - 10.1016/j.colsurfa.2004.04.018

M3 - Article

AN - SCOPUS:4143110492

SN - 0927-7757

VL - 241

SP - 253

EP - 256

JO - Colloids and Surfaces A: Physicochemical and Engineering Aspects

JF - Colloids and Surfaces A: Physicochemical and Engineering Aspects

IS - 1-3

ER -

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

Abstract

Keywords

Access to Document

Other files and links

Fingerprint

Cite this