Materials Science and Nanotechnology

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Thermodynamic analysis of nano particle ceria-based oxides at elevated pressure for solar thermochemical redox cycles fuel production

International Conference on Nanomaterials and Nanochemistry
November 29-30, 2017 | Atlanta, USA

Bahram Sadaftar

KTH Royal Institute of Technology, Sweden

Posters & Accepted Abstracts : Mater Sci Nanotechnol

Abstract:

The thermodynamics of nano-ceria-based metal oxides have been studied in the context of solar thermochemical redox cycles for splitting H2O and CO2 at elevated pressure. Because of the resistance to high temperature of nano-ceriabased metal oxides MxCe1−xO2, such systems are suitable for resolving stability problems frequently encountered with high-temperature operations. Catalytic systems for CO2/H2O conversion, with Gd, Y, Sm, Ca, Sr, nano-particle ceria-based perovskite, were synthesized, and tested at close to industrial conditions at the Royal Institute of Technology in Stockholm. Oxygen nonstoichiometric was investigated at high temperatures, pressure for a redox system. Subsequently, relevant thermodynamic parameters were computed and equilibrium H2 and CO concentrations determined as a function of reduction conditions (T, PO2) and ensuing oxidation temperature. At 8 bar and above 1073 K, the degree of reduction is positive for pure nanoceria particle. As a result, at a given reduction temperature and elevated pressure, more H2 and CO is generated at equilibrium state.

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