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Citation link: https://doi.org/10.26092/elib/2455

Publisher DOI: https://doi.org/10.1016/j.apcata.2015.06.011
J. Ulpts, W. Dreher, M. Klink, J. Thöming, NMR imaging of gas phase hydrogenation_2015_accepted version_Deckblatt_pdfa1.pdf
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NMR imaging of gas phase hydrogenation in a packed bed flow reactor


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J. Ulpts, W. Dreher, M. Klink, J. Thöming, NMR imaging of gas phase hydrogenation_2015_accepted version_Deckblatt_pdfa1.pdf2.46 MBAdobe PDFView/Open
Authors: Ulpts, Jürgen  
Dreher, Wolfgang  
Klink, Miriam 
Thöming, Jorg  
Abstract: 
In situ analysis of heterogeneously catalyzed gas phase reaction systems is becoming a valuable aid to their modeling and optimization. The commonly applied methods are either invasive, do not provide spatial information or are not applicable for optically inaccessible systems. This work investigates the possibility to use NMR imaging to study gas phase reaction processes in situ, spatially resolved and non-invasively.

A multislice NMR spectroscopic imaging pulse sequence, which was optimized to realize ultrashort echo time TE, was employed to study the ethylene hydrogenation reaction in an NMR-compatible packed bed flow reactor. The catalyst bed, containing inactive γ-Al2O3 pellets and Pt-Al2O3 pellets, was subdivided into several sections in order to identify reaction zones that depend on initial conditions. Spatial mapping of the chemical composition was demonstrated on the basis of two experiments with varying initial volume flow and ethylene conversion. The inlet and outlet temperature of the catalyst bed was simultaneously detected by analyzing the spectra of inserted glycol capsules.

The resulting spatial shift of the reactive zones in both experiments could be proven by the spatially resolved concentration measurements and the temperature measurements. The locations of single active catalyst pellets were also detectable by the same measure. The quantitative results of product gas composition of both experiments were in good agreement with accompanying mass spectrometric measurements.

The results demonstrate the applicability of NMR imaging methods to investigate gas phase reaction processes and can help to establish these methods as a standard tool to map chemical transformations in gas flow reactors.
Keywords: MRI gas measurements; Heterogeneously catalyzed gas phase reactions; Non invasive measurements of chemical composition; Fixed bed reactor; Ethylene hydrogenation; Multislice magnetic resonance spectroscopic imaging; Mimenima
Issue Date: 6-Jul-2015
Publisher: Elsevier
Project: MIMENIMA GRK 1860 
Funders: Deutsche Forschungsgemeinschaft
Grant number: 601090
Journal/Edited collection: Applied Catalysis A: General 
Start page: 340
End page: 349
Band: 502
Type: Artikel/Aufsatz
ISSN: 0926-860X
Secondary publication: yes
Document version: Postprint
DOI: 10.26092/elib/2455
URN: urn:nbn:de:gbv:46-elib71346
Institution: Universität Bremen 
Faculty: Zentrale Wissenschaftliche Einrichtungen und Kooperationen 
Fachbereich 02: Biologie/Chemie (FB 02) 
Institute: Zentrum für Umweltforschung und nachhaltige Technologien (UFT) 
Appears in Collections:Forschungsdokumente

  

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