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Solid state and gas phase NMR studies of immobilized catalysts and catalytic active nanoparticles

Adamczyk, A. and Xu, Y. and Walaszek, B. and Roelofs, F. and Pery, T. and Pelzer, K. and Philippot, K. and Chaudret, B. and Limbach, H. H. and Breitzke, H. and Buntkowsky, G. (2008):
Solid state and gas phase NMR studies of immobilized catalysts and catalytic active nanoparticles.
In: Topics in Catalysis, pp. 75-83, 48, (1-4), [Online-Edition: http://apps.webofknowledge.com/full_record.do?product=WOS&se...],
[Article]

Abstract

In the current study two new classes of stabile, catalytic active nanomaterials are investigated. The first class of nanoparticles consists of an inner metal core. To stabilize their structure the metal core is surrounded by organic ligands or embedded in a polymer. The second class consists of catalysts immobilized on mesoporous silica supports of SBA-3 type silica. Employing I combination of H-1, H-2, C-13 and Si-29-solid state NMR spectroscopy the structure of the catalysts is analyzed. As a simple model for the catalytic properties of the particles, the activation of H-2(2) gas on the surface of the Particles is Studied. Employing H-1 and H-2 gas phase NMR the kinetics of simple catalytic model reactions is Studied. Employing H-2-NMR solid state NMR spectroscopy, the interaction of the metal surface with the substrate is characterized and kinetic data, which characterize the mobility of the deuterium on the surface, are extracted. For the interpretation of these data, parallel NMR studies of model eta(2)-bound transition metal complexes are employed, which allow, owing to their simpler geometry and higher sensitivity, I quantitative modeling of the spin dynamics in the NMR experiment.

Item Type: Article
Erschienen: 2008
Creators: Adamczyk, A. and Xu, Y. and Walaszek, B. and Roelofs, F. and Pery, T. and Pelzer, K. and Philippot, K. and Chaudret, B. and Limbach, H. H. and Breitzke, H. and Buntkowsky, G.
Title: Solid state and gas phase NMR studies of immobilized catalysts and catalytic active nanoparticles
Language: English
Abstract:

In the current study two new classes of stabile, catalytic active nanomaterials are investigated. The first class of nanoparticles consists of an inner metal core. To stabilize their structure the metal core is surrounded by organic ligands or embedded in a polymer. The second class consists of catalysts immobilized on mesoporous silica supports of SBA-3 type silica. Employing I combination of H-1, H-2, C-13 and Si-29-solid state NMR spectroscopy the structure of the catalysts is analyzed. As a simple model for the catalytic properties of the particles, the activation of H-2(2) gas on the surface of the Particles is Studied. Employing H-1 and H-2 gas phase NMR the kinetics of simple catalytic model reactions is Studied. Employing H-2-NMR solid state NMR spectroscopy, the interaction of the metal surface with the substrate is characterized and kinetic data, which characterize the mobility of the deuterium on the surface, are extracted. For the interpretation of these data, parallel NMR studies of model eta(2)-bound transition metal complexes are employed, which allow, owing to their simpler geometry and higher sensitivity, I quantitative modeling of the spin dynamics in the NMR experiment.

Journal or Publication Title: Topics in Catalysis
Volume: 48
Number: 1-4
Uncontrolled Keywords: mesoporous silica immobilized catalysts solid-state nmr nano-catalysts dihydrogen heterogeneous nucleophilic catalyst rhodium hydrogenation catalysts mesoporous silica nanosphere transition-metal dihydrides dihydrogen complexes crystal-structure ruthenium nanoparticles molecular-dynamics ligand h-2
Divisions: 07 Department of Chemistry
07 Department of Chemistry > Physical Chemistry
Date Deposited: 27 Oct 2014 20:33
Official URL: http://apps.webofknowledge.com/full_record.do?product=WOS&se...
Additional Information:

312VX Times Cited:18 Cited References Count:90

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