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  4. Diffusion weighted magnetic resonance imaging for temperature measurements in catalyst supports with an axial gas flow
 
Zitierlink DOI
10.26092/elib/2475
Verlagslink DOI
10.1039/C9RE00082H

Diffusion weighted magnetic resonance imaging for temperature measurements in catalyst supports with an axial gas flow

Veröffentlichungsdatum
2019-07-24
Autoren
Mirdrikvand, Mojtaba  
Ridder, Harm  
Thöming, Jorg  
Dreher, Wolfgang  
Zusammenfassung
In situ thermometry of catalytic gas phase reactions allows the determination of temperature profiles in catalyst beds. In NMR imaging systems used for measuring the chemical composition of species in model reactors, temperature measurements by NMR spectroscopy are technically challenging and confined to a rather low temperature range. In this study, an optimized NMR in situ technique is proposed, which will allow the determination of the temperature distribution in highly exothermic reactions on structured catalysts. Diffusion weighted magnetic resonance imaging (DW-MRI) was successfully applied as an alternative method for temperature measurements commonly performed by chemical shift measurements using ethylene glycol. DW-MRI applied with different diffusion sensitizing gradients allows high-resolution imaging of the temperature dependent diffusion coefficient, without the need for high spatial homogeneity of the magnetic field. Using 3D DW-MRI on ethylene glycol, glycerol, and the temperature stable ionic liquid Pyr13 [TFSI] (decomposition temperature of 400 °C) as NMR thermometers, measurements were performed in a temperature range from 20 to 160 °C. The proposed method can be used in reaction engineering approaches performed in NMR systems.
Schlagwörter
Mimenima
Verlag
Royal Society of Chemistry
Institution
Universität Bremen  
Fachbereich
Fachbereich 02: Biologie/Chemie (FB 02)  
Zentrale Wissenschaftliche Einrichtungen und Kooperationen  
Institute
Zentrum für Umweltforschung und nachhaltige Technologien (UFT)  
Dokumenttyp
Artikel/Aufsatz
Zeitschrift/Sammelwerk
Reaction Chemistry & Engineering  
Band
4
Startseite
1844
Endseite
1853
Zweitveröffentlichung
Ja
Dokumentversion
Postprint
Lizenz
Alle Rechte vorbehalten
Sprache
Englisch
Dateien
Lade...
Vorschaubild
Name

M. Mirdrikvand, H. Ridder, J. Thöming, W. Dreher, Diffusion weighted magnetic resonance imaging_2019_accepted version_Deckblatt_pdfa1.pdf

Size

3.36 MB

Format

Adobe PDF

Checksum

(MD5):c549c52f39feae2a8721b956978b199e

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