NGLC 2004-2010.National Geological Library of China All Rights Reserved. Add:29 Xueyuan Rd,Haidian District,Beijing,PRC. Mail Add: 8324 mailbox 100083 For exchange or info please contact us via email. |
NGLC 2004-2010.National Geological Library of China All Rights Reserved. Add:29 Xueyuan Rd,Haidian District,Beijing,PRC. Mail Add: 8324 mailbox 100083 For exchange or info please contact us via email. |
-MnO2 with different morphologies, i.e., nanorods and conventionalparticulates, were prepared by homogeneous deposition-precipitation using urea as the precipitation agent.The catalysts were extensively characterized by a combination of different techniques (N2 adsorption, X-raydiffraction (XRD), transmission electron microscopy (TEM), hydrogen temperature-programmed reduction(H2-TPR), and X-ray photoelectron spectroscopy (XPS)) in relation to their performance for liquid-phaseaerobic oxidation of benzyl alcohol under solvent-free conditions. TEM analysis showed that the two typesof gold catalysts have similar gold particle size distributions. TPR results indicated that the presence of Austrongly promotes MnO2 reduction in the Au/MnO2-R system. XPS revealed both reduced and oxidized Auspecies on the MnO2 nanorods support before and after the reaction. Significantly enhanced catalytic activitywas observed for gold catalyst supported on MnO2 nanorods, as compared with that on commercial MnO2powders. The enhanced catalytic activity of the Au/MnO2-R catalyst was attributed to the beneficial presenceof higher amount of oxidized gold species and surface oxygen vacancies resulting from the strong interactionbetween Au and the well-defined reactive surface of MnO2 nanorods.