caa a22 4500 46322566X CHVBK 20180405153226.0 cr unu---uuuuu 170326e20071101xx s 000 0 eng 10.1007/s10853-007-1872-7 doi (NATIONALLICENCE)springer-10.1007/s10853-007-1872-7 Redox behavior and reduction mechanism of Fe2O3-CeZrO2 as oxygen storage material [Elektronische Daten] [Vladimir Galvita, Kai Sundmacher] Fe2O3-CeZrO2 is a suitable oxygen storage material for the production of pure hydrogen by a cyclic water gas shift (CWGS) process which is based on the reduction of the material by syngas followed by the re-oxidation of the reduced material with water vapor. For identification of the reduction kinetics H2-temperature programmed reduction experiments were performed. Several kinetic models were tested and the activation energy of reduction was calculated by the Kissinger method, by model-based curve fitting and by the isoconversional analysis method. The reduction of Fe2O3-CeZrO2was found to occur in a four-step process including the reduction of Fe2O3,Fe3O4, and CeZrO2. The overall process can be interpreted as phase-boundary controlled reduction of Fe2O3 to Fe3O4, and two-dimensional nucleation controlled reduction of Fe3O4 to Fe and of CeO2 to Ce2O3. At higher oxygen conversion, the reduction of Fe3O4 and CeO2 are significantly influenced by volume-diffusion in the solid bulk. Springer Science+Business Media, LLC, 2007 Galvita Vladimir Otto-von-Guericke-University Magdeburg, Process Systems Engineering, Universitätsplatz 2, 39106, Magdeburg, Germany aut Sundmacher Kai Otto-von-Guericke-University Magdeburg, Process Systems Engineering, Universitätsplatz 2, 39106, Magdeburg, Germany aut Journal of Materials Science Springer US; http://www.springer-ny.com 42/22(2007-11-01), 9300-9307 0022-2461 42:22<9300 2007 42 10853 https://doi.org/10.1007/s10853-007-1872-7 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10853-007-1872-7 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Galvita Vladimir Otto-von-Guericke-University Magdeburg, Process Systems Engineering, Universitätsplatz 2, 39106, Magdeburg, Germany aut NATIONALLICENCE 700 1- Sundmacher Kai Otto-von-Guericke-University Magdeburg, Process Systems Engineering, Universitätsplatz 2, 39106, Magdeburg, Germany aut NATIONALLICENCE 773 0- Journal of Materials Science Springer US; http://www.springer-ny.com 42/22(2007-11-01), 9300-9307 0022-2461 42:22<9300 2007 42 10853 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer