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- Title
Formation of a supported cobalt catalyst for the synthesis of carbon nanofibers on aluminum oxide.
- Authors
Kovalenko, G.; Rudina, N.; Perminova, L.; Skrypnik, O.
- Abstract
Comparative studies of the effect of the physicochemical characteristics of a support (aluminum oxide) on the formation of a supported Co catalyst and its activity in the pyrolysis of alkanes (propane-butane) were performed. The effect of the crystalline modification of alumina on the yield of catalytic filamentous carbon (CFC) ((g CFC)/(g Co)) was studied. The surface morphologies of Co-containing catalysts and synthesized carbon deposits were studied by scanning electron microscopy. It was found that carbon deposits with a well-defined nanofiber structure were synthesized by the pyrolysis of a propane-butane mixture in the presence of hydrogen at 600°C on supported Co catalysts prepared by homogeneous precipitation on macroporous corundum (α-Al2O3). The yield of CFC was no higher than 4 (g CFC)/(g Co). On the Co catalyst prepared by homogeneous precipitation on mesoporous Al2O3, the intense carbonization of the initial support; the formation of cobalt aluminates; and, as a consequence, the deactivation of Co0 as a catalyst of FC synthesis occurred. The dependence of the yield of CFC on the preheating temperature (from 200 to 800°C) of Co catalysts before pyrolysis was studied. It was found that, as the preheating temperature of supported Co/Al2O3 catalysts was increased, the amount of synthesized carbon, including CFC, decreased because of Co0 deactivation due to the interaction with the support and coke formation.
- Subjects
NANOFIBERS; ALUMINUM oxide; COBALT catalysts; SCANNING electron microscopy; PYROLYSIS; ALKANES; PRECIPITATION (Chemistry)
- Publication
Kinetics & Catalysis, 2010, Vol 51, Issue 3, p449
- ISSN
0023-1584
- Publication type
Article
- DOI
10.1134/S0023158410030195