Walaszek, B. ; Xu, Y. P. ; Adamczyk, A. ; Breitzke, H. ; Pelzer, K. ; Limbach, H. H. ; Huang, J. L. ; Li, H. X. ; Buntkowsky, G. (2009)
H-2-solid-state-NMR study of hydrogen adsorbed on catalytically active ruthenium coated mesoporous silica materials.
In: Solid State Nuclear Magnetic Resonance, 35 (3)
Artikel, Bibliographie

Kurzbeschreibung (Abstract)

H-2 solid-state NMR measurements were performed on three samples of ruthenium nanoparticles synthesized inside two different kinds of mesoporous silica, namely SBA-3 silica materials and SBA-15 functionalized with -COOH groups and loaded with deuterium gas. The line-shape analyses of the spectra reveal the different deuteron species. In all samples a strong -OD signal is found, which shows the catalytic activity of the metal, which activates the D-D bond and deuterates the -SiOH groups through the gas phase, corroborating their usability as catalysts for hydrogenation reactions. At room temperature the mobility of the -Si-OD groups depends on the sample preparation. In addition to the -Si-OD deuterons, the presence of different types of deuterons bound to the metal is revealed. The singly coordinated -Ru-D species exhibit several different quadrupolar couplings, which indicate the presence of several non-equivalent binding sites with differing binding strength. In addition to the dissociated hydrogen species there is also a dihydrogen species -Ru-D-2, which is attributed to defect sites on the surface. It exhibits a fast rotational dynamics at all temperatures. Finally there are also indications of three-fold coordinated surface deuterons and octahedrally coordinated deuterons inside the metal. (c) 2009 Elsevier Inc. All rights reserved.

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