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Leaching Kinetics of Fe2Al5 and Skeletal Iron Formation

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Abstract

Caustic leaching of fine particles of Fe2Al5 alloy to produce skeletal Fe catalysts was studied using a 24 factorial experimental design, in which alloy particle size, aqueous NaOH concentration, temperature and stirrer speed were varied. Analysis of the results from the design showed that the BET surface area of the skeletal iron increased with decreases in temperature, caustic concentration and particle size according to SBET = 222.7 − 0.461 · T − 2.35 · cNaOH − 0.0245 · D p. An Avrami–Erofeev model −ln(1 − α) = kt with an activation energy of 55 ± 5 kJ mol−1 and a shrinking core model for volume contraction 1 − (1 − α)1/3 = kt and an activation energy of 56 ± 5 kJ mol−1 provided the best fit to the kinetic data for leaching.

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Acknowledgements

The financial support of the Australian Research Council to the ARC Center of Excellence for Functional Nanomaterials for this research project is gratefully acknowledged.

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  1. ARC Center of Excellence for Functional Nanomaterials, School of Chemical Engineering, University of New South Wales, Sydney, NSW, 2052, Australia

    Thomas M. Leoni, Andrew J. Smith & Mark S. Wainwright

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  1. Thomas M. Leoni
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  2. Andrew J. Smith
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  3. Mark S. Wainwright
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Correspondence to Mark S. Wainwright.

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Leoni, T.M., Smith, A.J. & Wainwright, M.S. Leaching Kinetics of Fe2Al5 and Skeletal Iron Formation. Top Catal 53, 1166–1171 (2010). https://doi.org/10.1007/s11244-010-9555-z

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