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  4. High-Resolution Characterization of Liquid-Crystalline [60]Fullerenes Using Solid-State Nuclear Magnetic Resonance Spectroscopy
 
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High-Resolution Characterization of Liquid-Crystalline [60]Fullerenes Using Solid-State Nuclear Magnetic Resonance Spectroscopy

Auteur(s)
Dvinskikh, Sergey V.
Editeur(s)
Yamamoto, Kazutoshi
Scanu, David
Deschenaux, Robert 
Institut de chimie 
Ramamoorthy, Ayyalusamy
Date de parution
2008
In
Journal of the American Chemical Society (JACS), American Chemical Society (ACS), 2008/112/39/12347–12353
Résumé
In situ attenuated total reflection infrared spectroscopy in a flow-through cell combined with online UV−vis spectroscopy was used to investigate the oxidation of 2-propanol over Pd/Al<sub>2</sub>O<sub>3</sub> catalyst. The state of the catalyst was driven fast between reduced and oxidized by admitting alternately dissolved hydrogen and oxygen, and the response of the catalytic solid−liquid interface was followed in time. Besides the oxidation product acetone and the water that forms, when hydrogen and oxygen are simultaneously adsorbed on the catalyst surface, an additional species was observed with a characteristic band at ∼1065 cm-1. On the basis of the transient character of the adsorbate and density functional theory calculations, we assign this species to adsorbed 2-propoxide. Its observation indicates that the second dehydrogenation step is rate limiting in an oxidative dehydrogenation mechanism. The results furthermore show that adsorbed hydrogen and oxygen limit the dissociative adsorption of 2-propanol and that 2-propoxide can be hydrogenated back to the reactant in the presence of adsorbed hydrogen.
URI
https://libra.unine.ch/handle/123456789/4528
DOI
10.1021/jp803265z
Autre version
http://dx.doi.org/10.1021/jp803265z
Type de publication
Resource Types::text::journal::journal article
Dossier(s) à télécharger
 main article: Dvinskikh_Sergey_V._-_High-Resolution_Characterization_of_Liquid-Crystalline_20170613182755-KA.pdf (954.37 KB)
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