(200b) Impact of Reduction of Flowing Particles on System Efficiency for Solar Thermochemical Hydrogen Production

Authors: 
Ehrhart, B. D., University of Colorado at Boulder
Muhich, C. L., University of Colorado at Boulder
Al-Shankiti, I., University of Colorado at Boulder
Ward, B. J., University of Colorado at Boulder
Weimer, A. W., University of Colorado at Boulder

Overall system efficiency for solar thermochemical hydrogen production is critically important. Here, an analysis of different reduction methods is examined using cerium oxide as a well-studied example material. These calculations include gas heating recuperation and thermodynamic separation work requirements, as well as a discussion of the relative sensitivity of each of these factors. The efficiency calculation uses thermodynamic equilibrium states of the active material to determine the reactivity and production capacity. Calculations are performed for flowing particles through a two-step solid oxide reduction and oxidation cycle. Spray dried particles for use in such a process were synthesized and characterized.