Oxidation Kinetics of Hercynite Spinels for Solar Thermochemical Fuel Production

1 Classification: General Business Use Oxidation Kinetics of Hercynite Spinels for Solar Thermochemical Fuel Production Authors: Samantha L. Millican 1 , Iryna Androshchuk 1 , Justin T. Tran 1 , Ryan M. Trottier 1 , Alicia Bayon 2 , Yahya Al Salik 3 , Hicham Idriss 3 , Charles B. Musgrave 1,4,5 , and Alan W. Weimer 1* Affiliations: 1 Department of Chemical and Biological Engineering, University of Colorado, Boulder, Colorado 80309, USA 2 CSIRO Energy, PO Box 330, Newcastle, NSW 2300, Australia 3 Center for Research and Development, Saudi Basic Industries Corporation (SABIC) at KAUST, Thuwal, Saudi Arabia 4 National Renewable Energy Laboratory, Golden, CO 80401, USA 5 Department of Chemistry, University of Colorado, Boulder, Colorado 80309, USA *Correspondence to: [email protected] Abstract The development of an economically viable solar thermochemical fuel production process relies largely on identifying redox active materials with optimized thermodynamic and kinetic properties. Iron aluminate (FeAl2O4, hercynite) and cobalt-iron aluminate (CoxFe1-xAl2O4) have both been demonstrated as viable redox-active materials for this process. However, doping with cobalt produces a qualitative tradeoff between the thermodynamic and kinetic properties of hercynite by improving the reaction kinetics although, so far, at the expense of some drop in the overall activity per unit weight. In this work, we evaluate four spinel aluminate materials with varying cobalt contents (FeAl2O4, Co0.05Fe0.95Al2O4, Co0.25Fe0.75Al2O4, and Co0.40Fe0.60Al2O4) to better understand the role of cobalt in the redox mediating properties of these materials and to quantify its effect on the thermodynamic and kinetic properties for CO2 reduction. A solid-state

Oxidation Kinetics of Hercynite Spinels for Solar Thermochemical Fuel Production

Documents

solar thermal

thermochemical analysis

reaction kinetics

hercynite

co2 reduction

in situ xps