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Hong H.,Soochow University of China | Hu L.,Soochow University of China | Li M.,Soochow University of China | Zheng J.,Soochow University of China | And 5 more authors.
Chemistry - A European Journal | Year: 2011

Iron oxide coated platinum nanowires (Pt@Fe2O3 NWs) with a diameter of 2.8 nm have been prepared by the oxygen oxidation of FePt NWs in oleylamine. These "cable"-like NWs were characterised by transmission electron microscopy, X-ray diffraction, X-ray photoelectron spectroscopy and X-ray absorption fine structure analysis. These Pt@Fe 2O3 NWs were used as "non-support" heterogeneous catalysts in oxidation of olefins and alcohols. The results revealed that it is an active and highly selective catalyst. Styrene derivatives were tested with molecular oxygen as the sole oxidant, with benzaldehyde successfully obtained from styrene in an absolute yield of 31 %, whereas the use of tert-butyl hydroperoxide as the sole oxidant in the oxidation of alcohols led to yields of more than 80 % of the corresponding ketone or aldehyde. This unsupported catalyst was found to be more active (TOF=96.5 h-1) than other reported Fe2O3 nanoparticle catalysts and could be recycled multiple times without any notable decrease in activity. Our findings will extend the use of such nanomaterial catalysts to new catalytic systems. © 2011 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim. Source


Hu L.,Soochow University of China | Shi L.,Soochow University of China | Hong H.,Soochow University of China | Li M.,Soochow University of China | And 6 more authors.
Chemical Communications | Year: 2010

A novel FePt@Cu nanowire catalyst was prepared by the reduction of Cu(acac)2 on the surface of FePt nanowires, in oleylamine (OAm). This nanowire catalyst efficiently epoxidised stilbene in the presence of molecular oxygen, and the conversion and selectivity were maintained with repeated use of the catalyst, compared with recycled catalyst. © 2010 The Royal Society of Chemistry. Source


Hu L.,Soochow University of China | Cao X.,Soochow University of China | Ge D.,Soochow University of China | Hong H.,Soochow University of China | And 7 more authors.
Chemistry - A European Journal | Year: 2011

Traditionally important in the pharmaceutical, agrochemical, and synthetic dye industries, C-N coupling has proved useful for the preparation of a number of valuable organic compounds. Here, a new method for the direct one-pot reductive C-N coupling from carbonyl and aromatic nitro compounds is described. Employing ultrathin platinum nanowires as the catalyst and hydrogen as the reducing agent, N-alkylamines were achieved in high yields. Debenzylation products were not detected after prolonged reaction times. Time-dependent analysis, ReactIR spectroscopy and DFT calculations revealed that the C-N coupling proceeded through a different mechanism than traditional "reductive amination." N-Alkylamines were directly obtained by intermolecular dehydration over platinum nanowires under a hydrogen atmosphere, instead of intramolecular water elimination and imine hydrogenation. © 2011 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim. Source

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