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The effect of aluminium oxide on the reduction of cobalt oxide and thermostabillity of cobalt and cobalt oxide

  • Research Article
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Central European Journal of Chemistry

Abstract

During precipitation and calcination at 200°C nanocrystalline Co3O4 was obtained with average size crystallites of 13 nm and a well developed specific surface area of 44 m2 g−1. A small addition of a structural promoter, e.g. Al2O3, increases the specific surface area of the cobalt oxide (54 m2 g−1) and decreases the average size of crystallites (7 nm). Al2O3 inhibits the reduction process of Co3O4 by hydrogen. Reduction of cobalt oxide with aluminium oxide addition runs by equilibrium state at all the respective temperatures. The apparent activation energy of the recrystallization process of the nanocrystalline cobalt promoted by the aluminium oxide is 85 kJ mol−1. Aluminium oxide improves the thermostability of both cobalt oxide and the cobalt obtained as a result of oxide phase reduction.

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Authors and Affiliations

  1. Institute of Chemical and Environment Engineering, West Pomeranian University of Technology in Szczecin, 70-322, Szczecin, Poland

    Zofia Lendzion-Bieluń, Roman Jędrzejewski & Walerian Arabczyk

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  1. Zofia Lendzion-Bieluń
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  2. Roman Jędrzejewski
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  3. Walerian Arabczyk
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Correspondence to Zofia Lendzion-Bieluń.

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Lendzion-Bieluń, Z., Jędrzejewski, R. & Arabczyk, W. The effect of aluminium oxide on the reduction of cobalt oxide and thermostabillity of cobalt and cobalt oxide. cent.eur.j.chem. 9, 834–839 (2011). https://doi.org/10.2478/s11532-011-0059-x

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  • DOI: https://doi.org/10.2478/s11532-011-0059-x

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