Molecules 2010, 15(2), 747-765; doi:10.3390/molecules15020747
Article

Catalytic Performance of Ceria Nanorods in Liquid-Phase Oxidations of Hydrocarbons with tert-Butyl Hydroperoxide

Received: 9 December 2009; in revised form: 28 January 2010 / Accepted: 29 January 2010 / Published: 2 February 2010
(This article belongs to the Special Issue Nano-catalysts and Nano-technologies for Green Organic Synthesis)
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Abstract: The CeO2 nanorods (CeNR) promote the oxidation of ethylbenzene (PhEt) and cyclohexene with t-BuOOH, at temperatures as low as 55 ºC. For both substrates the saturated C-H bonds are preferentially activated over the unsaturated ones. The catalyst seems fairly stable towards leaching phenomena. The liquid-phase oxidation catalysis may be associated with the Ce3+/Ce4+ inter-conversion in the one-electron redox processes mediating the formation of tert-butyl-(per)oxy radicals. CeNR is very effective in H2O2 disproportionation. Pre-treatment of CeNR with H2O2 or t-BuOOH prior to the catalytic reaction enhances the reaction rate of PhEt with t-BuOOH in comparison to CeNR. Textural characterization and spectroscopic studies suggest that catalytic activation is associated to defect sites.
Keywords: cerium oxide; nanorods; catalysis; oxidation; liquid phase; free radical mechanism
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MDPI and ACS Style

Macedo, A.G.; Fernandes, S.E.M.; Valente, A.A.; Ferreira, R.A.S.; Carlos, L.D.; Rocha, J. Catalytic Performance of Ceria Nanorods in Liquid-Phase Oxidations of Hydrocarbons with tert-Butyl Hydroperoxide. Molecules 2010, 15, 747-765.

AMA Style

Macedo AG, Fernandes SEM, Valente AA, Ferreira RAS, Carlos LD, Rocha J. Catalytic Performance of Ceria Nanorods in Liquid-Phase Oxidations of Hydrocarbons with tert-Butyl Hydroperoxide. Molecules. 2010; 15(2):747-765.

Chicago/Turabian Style

Macedo, Andreia G.; Fernandes, Sílvia E. M.; Valente, Anabela A.; Ferreira, Rute. A. S.; Carlos, Luís D.; Rocha, João. 2010. "Catalytic Performance of Ceria Nanorods in Liquid-Phase Oxidations of Hydrocarbons with tert-Butyl Hydroperoxide." Molecules 15, no. 2: 747-765.

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