Abstract:Solar thermochemical redox cycles provide a sustainable pathway for solar fuel processing. If done in porous (ceria) structures, they can profit from faster reaction rates owned to the enhanced heat and mass transport characteristics. However, the exact porous structure and operating conditions significantly affect the performance. We present a transient volume-averaged fixed-bed model of a thermochemical redox reactor utilizing macroporous ceria. We studied the porosity-dependent (ε=0.4-0.9) and operating con… Show more
“…However, in real-world applications, the effective particle size of reticulated porous ceramic (RPC)based reactants can reach the centimeter scale depending on the morphology of the reactants and the fabrication processes. 23,41 Thus, to determine the effect of the bulk diffusion of ceria on the kinetic behavior, we further increased the particle size up to 1 cm and a sensitivity analysis of the different bulk diffusion coefficients ( D in the range of 10 −4 to 10 −6 cm 2 s −1 ) reported in the literature 42 was conducted to study the effects of material size and intrinsic properties on the reaction rate. Fig.…”
Two-step thermochemical H2O/CO2 splitting offers a promising approach to convert intermittent solar energy into storable fuels. However, achieving efficient reaction kinetics in dense particles requires a comprehensive understanding of bulk...
“…However, in real-world applications, the effective particle size of reticulated porous ceramic (RPC)based reactants can reach the centimeter scale depending on the morphology of the reactants and the fabrication processes. 23,41 Thus, to determine the effect of the bulk diffusion of ceria on the kinetic behavior, we further increased the particle size up to 1 cm and a sensitivity analysis of the different bulk diffusion coefficients ( D in the range of 10 −4 to 10 −6 cm 2 s −1 ) reported in the literature 42 was conducted to study the effects of material size and intrinsic properties on the reaction rate. Fig.…”
Two-step thermochemical H2O/CO2 splitting offers a promising approach to convert intermittent solar energy into storable fuels. However, achieving efficient reaction kinetics in dense particles requires a comprehensive understanding of bulk...
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