Journal
NEW JOURNAL OF CHEMISTRY
Volume 40, Issue 4, Pages 3812-3820Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c5nj02571k
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- CSIR, New Delhi [CSC-0125, CSC-0117]
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Ag nanoparticles (with 2-5 nm size) supported on Mn3O4 nanorods were prepared in the presence of the cationic surfactant cetrimonium bromide using a hydrothermal method. The material was characterized in detailed by X-ray diffraction, scanning electron microscopy, X-ray photoelectron spectroscopy, transmission electron microscopy, scanning transmission electron microscopy-mapping, Raman spectroscopy, Fourier-transformed infrared spectroscopy and inductively coupled plasma-atomic emission spectroscopy. Electron microscopy studies revealed the formation of 1D nanorods morphology. XRD revealed the formation of Mn3O4 spinel phase and TEM showed that ultrasmall-sized metallic Ag-nanoparticles deposited on Mn3O4 spinel (nanorods). This Ag/Mn3O4 nanomaterial exhibited excellent catalytic activity in the cyclohexane oxidation reaction at room temperature. The impacts of various reaction parameters (e.g. time, substrate : H2O2 molar ratio etc.) were investigated in detail. A detailed characterization study demonstrated the correlation between the physicochemical properties of the Ag-Mn oxide nanorods and their catalytic performance. A cyclohexane conversion of 88% with 75% cyclohexanone selectivity with an overall C-6 selectivity (cyclohexanol + cyclohexanone) of 100% was accomplished at room temperature. The Ag/Mn3O4 catalyst hardly exhibited leaching up to eight reuses, proving its true heterogeneous nature.
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