Benzene hydrogenation by silica-supported catalysts made of Palladium nanoparticles and electrostatically immobilized Rhodium single sites
Articolo
Data di Pubblicazione:
2008
Citazione:
Benzene hydrogenation by silica-supported catalysts made of Palladium nanoparticles and electrostatically immobilized Rhodium single sites / P. Barbaro, C. Bianchini, V. Dal Santo, A. Meli, S. Moneti, C. Pirovano, R. Psaro, L. Sordelli, F. Vizza. - In: ORGANOMETALLICS. - ISSN 0276-7333. - 27:12(2008), pp. 2809-2824.
Abstract:
The complex [Rh(cod)(dppp)]OTf (Rh(cod)) has been immobilized onto silica-supported palladium nanoparticles (Pd/SiO2) via a dual H-bond/ionic interaction (dppp ) 1,3-bis(diphenylphosphino)propane;
cod ) cycloocta-1,5-diene). The product obtained, Rh(cod)-Pd/SiO2, has been employed to catalyze the
hydrogenation of benzene to cyclohexane, showing much higher activity as compared to Pd/SiO2, while
Rh(cod) grafted on bare silica (Rh(cod)/SiO2) is totally inactive. The catalyst generated by Rh(cod)-Pd/
SiO2 exhibits a remarkable stability and can be recycled several times with no loss of activity, even if
exposed to air. In situ and ex situ EXAFS and DRIFTS measurements, batch catalytic reactions under
different conditions, deuterium labeling experiments, and model organometallic studies, taken altogether,
have provided valuable mechanistic information. The reduction of benzene to cyclohexa-1,3-diene occurs
with the cooperation of the two metals, while the rhodium single sites are more effective than the palladium
nanoparticles in the hydrogenation of cyclohexa-1,3-diene to cyclohexane.
Tipologia IRIS:
01 - Articolo su periodico
Elenco autori:
P. Barbaro, C. Bianchini, V. Dal Santo, A. Meli, S. Moneti, C. Pirovano, R. Psaro, L. Sordelli, F. Vizza
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