Journal
MATERIALS RESEARCH BULLETIN
Volume 45, Issue 1, Pages 15-20Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.materresbull.2009.09.007
Keywords
Nanostructures; Electron microscopy; Raman spectroscopy; Catalytic properties
Categories
Funding
- 973 Project of China [2005CB623601]
- Jiangsu University of Science and Technology [35060810]
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Microspheres assembled from carbon nanotubes (MCNTs), with the diameters ranging from 5.5 to 7.5 mu m, were synthesized by means of pyrolysis of polypropylene and maleated polypropylene in an autoclave. The characterization of structure and morphology was carried out by X-ray diffractometer (XRD), field-emission scanning electron microscopy (FESEM), (high resolution) transmission electron microscope [(HR)TEM)], selected-area electron diffraction (SAED) and Raman spectrum. As a typical morphology, the possible growth process of MCNTs was also investigated and discussed. The results of nitrogen adsorption-desorption indicate that the Brunauer-Emett-Teller (BET) Surface area (140.6 m(2)/g) of the MCNTs obtained at 600 degrees C is about twice as that (74.5 m(2)/g) of carbon nanotubes obtained at 700 degrees C. The results of catalytic experiment show that MCNTs based catalyst has higher catalytic activity than the carbon nanotubes based catalyst for the preparation of methanol and dimethoxy-ethane by oxidation of dimethyl ether. (C) 2009 Elsevier Ltd. All rights reserved.
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