%0 Journal Article
%T Ice-Templated Geopolymer¡ªFe/Mn Oxide Composites Conceived as Oxygen Carriers
%A Annalisa Natali Murri
%A Elena Landi
%A Elettra Papa
%A Francesco Miccio
%A Valentina Medri
%J Ceramics | An Open Access Journal from MDPI
%D 2019
%R https://doi.org/10.3390/ceramics2010014
%X 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 ¡ãC, the temperature needed for CLC applications, the composite beads and monoliths possess similar total porosity % and total pore volume, being ¡Ö65% and 570 mm3 g£¿1, respectively, as well as a specific surface area of around 2.4¨C2.9 m2/g. View Full-Tex
%U https://www.mdpi.com/2571-6131/2/1/14