1H NMR Signal Broadening in Spectra of Alkane Molecules Adsorbed on MFI-Type Zeolites Full article
Journal |
Solid State Nuclear Magnetic Resonance
ISSN: 0926-2040 , E-ISSN: 1527-3326 |
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Output data | Year: 2008, Volume: 33, Number: 4, Pages: 65-71 Pages count : 7 DOI: 10.1016/j.ssnmr.2008.02.007 | ||||||||||
Tags | Alkane, CPMG, FAU, MAS, MFI, NMR, PFG, Silicalite-1, Zeolites | ||||||||||
Authors |
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Affiliations |
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Funding (4)
1 | German Research Foundation | FR 902/15 |
2 | German Research Foundation | GRK 1056/1 |
3 | German Research Foundation | Pa 907/3 |
4 | Society for Chemical Engineering and Biotechnology |
Abstract:
The anisotropic behavior of C1–C6 alkane molecules adsorbed in MFI zeolite was studied by 1
H nuclear magnetic resonance (NMR) using single-pulse excitation, Carr–Purcell–Meiboom–Gill (CPMG) pulse
sequence, Hahn echo (HE) pulse sequence, and magic-angle spinning. The molecular order parameter
was obtained by both static 2H NMR spectroscopy and molecular simulations. This yields an order
parameter in the range of 0.28–0.42 for linear alkanes in MFI zeolite, whereas the parameter equals zero
for FAU zeolite with a cubic symmetry. Thus, in the case of a zeolite with a non-cubic symmetry like
MFI, the mobility of the molecules in one crystallite cannot fully average the dipolar interaction. As a
consequence, transverse nuclear magnetization as revealed in the echo attenuation notably deviates
from a mono-exponential decay. This information is of particular relevance for the performance of
pulsed field gradient (PFG) NMR diffusion experiments, since the occurrence of non-exponential
magnetization attenuation could be taken as an indication of the existence of different molecules or of
molecules in different states of mobility
Cite:
Romanova E.E.
, Krause C.B.
, Stepanov A.G.
, Wilczok U.
, Schmidt W.
, van Baten J.M.
, Krishna R.
, Pampel A.
, Karger J.
, Freude D.
1H NMR Signal Broadening in Spectra of Alkane Molecules Adsorbed on MFI-Type Zeolites
Solid State Nuclear Magnetic Resonance. 2008. V.33. N4. P.65-71. DOI: 10.1016/j.ssnmr.2008.02.007 WOS Scopus РИНЦ
1H NMR Signal Broadening in Spectra of Alkane Molecules Adsorbed on MFI-Type Zeolites
Solid State Nuclear Magnetic Resonance. 2008. V.33. N4. P.65-71. DOI: 10.1016/j.ssnmr.2008.02.007 WOS Scopus РИНЦ
Dates:
Submitted: | Jan 22, 2008 |
Published online: | Mar 15, 2008 |
Published print: | May 1, 2008 |
Identifiers:
Web of science | WOS:000258048000001 |
Scopus | 2-s2.0-45849093975 |
Elibrary | 13585488 |
Chemical Abstracts | 2008:798725 |
Chemical Abstracts (print) | 151:345406 |
OpenAlex | W2121559484 |