Asanov, Igor P. and Asanova, Tatyana I. and Bulusheva, Lyubov Gennadievna and Shlyakhova, Elena V. and Okotrub, Alexander Vladimirovich and Flahaut, Emmanuel Thermal Decomposition of Co-Doped Calcium Tartrate and Use of the Products for Catalytic Chemical Vapor Deposition Synthesis of Carbon Nanotubes. (2012) Journal of Physical Chemistry C, pp. 116 (1). 343-351. ISSN 1932-7447
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Official URL: http://dx.doi.org/10.1021/jp2092169
Abstract
Thermal decomposition of Co-doped calcium tartrate in an inert atmosphere or air was studied using thermogravimetric analysis and X-ray absorption fine structure (XAFS) spectroscopy. It was shown that the powder substance containing 4 at.% of cobalt completely decomposes within 650-730 °C, depending on the environment, and the formation of Co clusters does not proceed before 470 °C. The products of decomposition were characterized by transmission electron microscopy, XAFS, and X-ray photoelectron spectroscopy. Surfaceoxidized Co metal nanoparticles as large as ∼5.6 ( 1.2 nm were found to form in an inert atmosphere, while the annealing in air led to a wide distribution of diameters of the nanoparticles, with the largest nanoparticles (30-50 nm) mainly present as a Co3O4 phase. It was found that the former nanoparticles catalyze the growth of CNTs from alcohol while a reducing atmosphere is required for activation of the latter nanoparticles. We propose the scheme of formation of CaO-supported catalyst from Co-doped tartrate, depending on the thermal decomposition conditions.
Item Type: | Article |
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Additional Information: | Thanks to ACS editor. The definitive version is available at http://pubs.acs.org/doi/abs/10.1021/jp2092169 |
HAL Id: | hal-03468651 |
Audience (journal): | International peer-reviewed journal |
Uncontrolled Keywords: | |
Institution: | French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE) Université de Toulouse > Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE) Other partners > Siberian Branch of the Russian Academy of Sciences - SB RAS (RUSSIA) Université de Toulouse > Université Toulouse III - Paul Sabatier - UT3 (FRANCE) |
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Deposited On: | 26 Aug 2013 10:15 |
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