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Ice-Templated Geopolymer—Fe/Mn Oxide Composites Conceived as Oxygen Carriers

National Research Council of Italy, Institute of Science and Technology for Ceramics (CNR-ISTEC), Via Granarolo 64, 48018 Faenza, RA, Italy
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Ceramics 2019, 2(1), 148-160; https://doi.org/10.3390/ceramics2010014
Received: 28 January 2019 / Revised: 15 February 2019 / Accepted: 25 February 2019 / Published: 1 March 2019
(This article belongs to the Special Issue Ice-Templated and Freeze-Cast Ceramics)
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Abstract

Ice-templating (freeze-casting) technique was applied to a novel class of geopolymer composites containing Fe/Mn oxides, previously tested and reported in others works as synthetic oxygen carriers for chemical looping combustion (CLC), in order to obtain composite monoliths with lamellar macro-porosities by unidirectional freezing of water-based sol-gel systems. Geopolymer-Fe/Mn oxides composites carriers were also produced as beads, suitable for fixed bed reactors, by an injection-solidification method in liquid nitrogen. After conditioning at 900 °C, the temperature needed for CLC applications, the composite beads and monoliths possess similar total porosity % and total pore volume, being ≈65% and 570 mm3 g−1, respectively, as well as a specific surface area of around 2.4–2.9 m2/g. View Full-Text
Keywords: ice-templating; composite; geopolymer; Mn2O3; Fe2O3; porosity ice-templating; composite; geopolymer; Mn2O3; Fe2O3; porosity
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Papa, E.; Medri, V.; Natali Murri, A.; Miccio, F.; Landi, E. Ice-Templated Geopolymer—Fe/Mn Oxide Composites Conceived as Oxygen Carriers. Ceramics 2019, 2, 148-160.

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