naa a22 4500 51077069X CHVBK 20180411092756.0 cr unu---uuuuu 180411e20131201xx s 000 0 eng 10.1007/s11837-013-0774-1 doi (NATIONALLICENCE)springer-10.1007/s11837-013-0774-1 Cobalt Ferrite in YSZ for Use as Reactive Material in Solar Thermochemical Water and Carbon Dioxide Splitting, Part II: Kinetic Modeling [Elektronische Daten] [Kyle Allen, Nick Auyeung, Nima Rahmatian, James Klausner, Eric Coker] The kinetics of 10wt.% cobalt ferrite (CoFe2O4) in 8mol.% yttria-stabilized zirconia, synthesized via the co-precipitation method and formed into a porous structure, are investigated in support of simulating the performance of a solar thermochemical reactor. Kinetic parameters for the thermal reduction (T-R) of CoFe2O4 at temperatures of 1325-1500°C were investigated by thermogravimetry. A nonlinear best fit of a uniform conversion model was used to determine kinetic parameters from experimental data. In the temperature range of 1375-1450°C, the activation energy and preexponential term were found to be 386±13kJmol−1 and 8.8×109±2.0×108min−1, respectively, while increasing at higher temperatures. Simultaneous thermogravimetric analysis and differential scanning calorimetry studies showed an increase in the reaction rate of T-R upon the onset of melting (1440°C). Oxidation studies of the material using CO2 yield an activation energy and preexponential term of 52.1±6.8kJmol−1 and 2.86±0.2min−1, respectively, which is in good agreement with past work. The reaction order for CO2 was determined to be 0.750±0.08. The reaction kinetics for oxidation using CO2 were best described by a 3-D diffusion Jander model. The Minerals, Metals & Materials Society, 2013 Allen Kyle Department of Mechanical and Aerospace Engineering, University of Florida, Gainesville, FL, USA aut Auyeung Nick Department of Mechanical and Aerospace Engineering, University of Florida, Gainesville, FL, USA aut Rahmatian Nima Department of Mechanical and Aerospace Engineering, University of Florida, Gainesville, FL, USA aut Klausner James Department of Mechanical and Aerospace Engineering, University of Florida, Gainesville, FL, USA aut Coker Eric Advanced Materials Laboratory, Sandia National Laboratories, Albuquerque, NM, USA aut JOM Springer US; http://www.springer-ny.com 65/12(2013-12-01), 1682-1693 1047-4838 65:12<1682 2013 65 11837 https://doi.org/10.1007/s11837-013-0774-1 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s11837-013-0774-1 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Allen Kyle Department of Mechanical and Aerospace Engineering, University of Florida, Gainesville, FL, USA aut NATIONALLICENCE 700 1- Auyeung Nick Department of Mechanical and Aerospace Engineering, University of Florida, Gainesville, FL, USA aut NATIONALLICENCE 700 1- Rahmatian Nima Department of Mechanical and Aerospace Engineering, University of Florida, Gainesville, FL, USA aut NATIONALLICENCE 700 1- Klausner James Department of Mechanical and Aerospace Engineering, University of Florida, Gainesville, FL, USA aut NATIONALLICENCE 700 1- Coker Eric Advanced Materials Laboratory, Sandia National Laboratories, Albuquerque, NM, USA aut NATIONALLICENCE 773 0- JOM Springer US; http://www.springer-ny.com 65/12(2013-12-01), 1682-1693 1047-4838 65:12<1682 2013 65 11837 Metadata rights reserved Springer special CC-BY-NC licence nationallicence SWISSBIB 51077069X BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer