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Solid-State NMR Investigations of Supported Ionic Liquid Phase Water-Gas Shift Catalysts: Ionic Liquid Film Distribution vs. Catalyst Performance

Haumann, M. and Schonweiz, A. and Breitzke, H. and Buntkowsky, G. and Werner, S. and Szesni, N. (2012):
Solid-State NMR Investigations of Supported Ionic Liquid Phase Water-Gas Shift Catalysts: Ionic Liquid Film Distribution vs. Catalyst Performance.
In: Chemical Engineering & Technology, 35 (8), pp. 1421-1426, [Online-Edition: http://apps.webofknowledge.com/full_record.do?product=WOS&se...],
[Article]

Abstract

The ionic liquid film distribution in supported ionic liquid phase (SILP) catalysts has been studied by solid-state NMR. EMIMNTf2 was immobilized onto silica gel 100 support with loadings between 0 and 40?vol.-%. The 1H NMR signals indicated an exchange process between the support's surface silanol groups and the protons of the ionic liquid. At ionic liquid loadings below 10?vol.-%, islands of ionic liquids seemed to form, whereas at higher loadings complete coverage of the support was achieved. The NMR-based film model was confirmed by gas phase water-gas shift experiments using known SILP catalysts with different ionic liquid loadings. At high ionic liquid loading, the activity of the catalyst decreased due to pore blocking. The NMR technique provided easy and reliable data for film formation and distribution and allows for optimization of SILP catalysts in the future.

Item Type: Article
Erschienen: 2012
Creators: Haumann, M. and Schonweiz, A. and Breitzke, H. and Buntkowsky, G. and Werner, S. and Szesni, N.
Title: Solid-State NMR Investigations of Supported Ionic Liquid Phase Water-Gas Shift Catalysts: Ionic Liquid Film Distribution vs. Catalyst Performance
Language: English
Abstract:

The ionic liquid film distribution in supported ionic liquid phase (SILP) catalysts has been studied by solid-state NMR. EMIMNTf2 was immobilized onto silica gel 100 support with loadings between 0 and 40?vol.-%. The 1H NMR signals indicated an exchange process between the support's surface silanol groups and the protons of the ionic liquid. At ionic liquid loadings below 10?vol.-%, islands of ionic liquids seemed to form, whereas at higher loadings complete coverage of the support was achieved. The NMR-based film model was confirmed by gas phase water-gas shift experiments using known SILP catalysts with different ionic liquid loadings. At high ionic liquid loading, the activity of the catalyst decreased due to pore blocking. The NMR technique provided easy and reliable data for film formation and distribution and allows for optimization of SILP catalysts in the future.

Journal or Publication Title: Chemical Engineering & Technology
Volume: 35
Number: 8
Uncontrolled Keywords: catalyst optimization ionic liquid film solid-state nmr supported ionic liquid water-gas shift mesoporous silica low-temperature silp catalysis glass formers hydroformylation sba-15 mcm-41 h-1 benzene-d(6) confinement
Divisions: 07 Department of Chemistry
07 Department of Chemistry > Physical Chemistry
Date Deposited: 27 Oct 2014 20:50
Official URL: http://apps.webofknowledge.com/full_record.do?product=WOS&se...
Additional Information:

Sp. Iss. SI 979GY Times Cited:3 Cited References Count:32

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