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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
Author to whom correspondence should be addressed.
Ceramics 2019, 2(1), 148-160;
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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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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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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