期刊
JOURNAL OF ALLOYS AND COMPOUNDS
卷 509, 期 35, 页码 8798-8803出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2011.06.078
关键词
Composite materials; Surfaces; Si-29 {H-1} CP-MAS NMR; X-ray photo-emission spectroscopy
资金
- MIUR [20077R3PXF_002]
- P.O.R. Sicilia, Misura 3.15 Azione C Quota Regionale
MCM-41 has been synthesized at two different pH using cetyl-trimethylammonium bromide (CTAB) surfactant as template and adding the silica precursor to aqueous solutions containing CTAB. The obtained solids were calcined at 600 degrees C for 4 h. Mn-MCM-41 powders with different Mn/Si molar ratios were prepared using the incipient wetness method, followed by calcination at 550 degrees C for 5 h. At the end of the impregnation process the powders colour changed from white to brown whose intensity depends on manganese quantity. The materials characterization was performed by X-ray diffraction, N-2 adsorption, Si-29 Cross Polarization-Magic Angle Spinning NMR, and X-ray Photoelectron Spectroscopy. The effects of the manganese quantity and of the structural characteristic of the MCM-41 support were studied. The catalytic activity of the prepared systems was evaluated in a complete n-hexane oxidation. (c) 2011 Elsevier B.V. All rights reserved.
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