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Bücher Englische Bücher Wissen & Bildung Naturwissenschaft, Medizin, Informatik, Technik Chemie Anorganische Chemie Characterization of the surface chemistry of metal nanoparticles as catalysts in selected reactions by NMR
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Characterization of the surface chemistry of metal nanoparticles as catalysts in selected reactions by NMR
Niels Rothermel (Unbekannter Einband, Englisch)
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Beschreibung
The surface chemistry of the morphologically resembling metal nanoparticle systems Ru/dppb,RuPt/dppb and Pt/dppb is investigated. The particles are compared by their activity towards gaseous hydrogen in a metal surface/gas phase H/D exchange experiment which is monitored by 1H gas phase NMR. It is observed that Ru/dppb has the highest activity in the isotope exchange reaction and that all three… systems catalyze a partly decomposition of their stabilizing dppb ligand system where the Pt/dppb system has the highest tendecy to decompose. The partly decomposition of dppb is further characterized exemplarily on Ru/dppb by CP MAS solid state NMR.
As a consequence of the observed deuteration of decomposition products which were produced in the H/D exchange study, the Ru/dppb system is tested as alkane deuteration catalyst in a heterogeneous reaction with a range of alkanes as substrate. It is demonstrated that although the activity is low in general, it is selectively higher for cyclopentane as substrate (up to 40% deuteration). The selectivity towards cyclopentane is not caused by steric effects, bindingor activation enthalpies, which is ruled out by theoretical studies, but its cause is not yet clarified.
In a further study the fate of 15NH3 adsorbed on Ru/dppb is investigated in a series of solid state NMR experiments (CP MAS, sostapt, NQS). From the experiments it is concluded that ammonia exists in different binding environments and that Ru/dppb activates the N-H bond. The N-H bond activation is verified in a co-adsorption experiment of 15NH3 and 13CO on Ru/dppb. The 15N and 13C CP MAS spectra of the adsorbed species show signals with chemical shift values that are typical for urea, thereby confirming the ammonia activation. Dieses Produkt haben wir gerade leider nicht auf Lager.
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Technische Daten
Erscheinungsdatum
15.06.2020
Sprache
Englisch
EAN
9783967290509
Herausgeber
Mensch & Buch
Sonderedition
Nein
Autor
Niels Rothermel
Seitenanzahl
110
Auflage
1
Einbandart
Unbekannter Einband
Einbandart Details
Klebebindung
-.-
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