Solar Redox Cycling of Ceria Structures Based on Fiber Boards, Foams, and Biomimetic Cork-Derived Ecoceramics for Two-Step Thermochemical H2O and CO2 Splitting - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Energy & Fuels Année : 2020

Solar Redox Cycling of Ceria Structures Based on Fiber Boards, Foams, and Biomimetic Cork-Derived Ecoceramics for Two-Step Thermochemical H2O and CO2 Splitting

Anita Haeussler
Fernando A. Costa Oliveira
  • Fonction : Auteur
M. Alexandra Barreiros
  • Fonction : Auteur
A. P. F. Caetano
  • Fonction : Auteur
Rui M. Novais
  • Fonction : Auteur
Robert C. Pullar
  • Fonction : Auteur

Résumé

Solar thermochemical conversion of H 2 O and captured CO 2 is considered for the production of high-value solar fuels and CO 2 valorization, using non-stoichiometric oxygen-exchange redox materials. This work aims to compare the thermochemical cycle performance of different ceria structures, including biomimetic cork-templated ceria (CTCe), ceria foam (CeF) and ceria bulk fiber (CeFB), to study the effect of the morphology on fuel production from two-step H 2 O and CO 2 splitting via solar redox cycling. The considered materials underwent thermochemical cycles in a directly-irradiated solar reactor under various operating conditions. Typically, a thermal reduction at 1400 °C under Ar at atmospheric pressure, using concentrated solar energy, was carried out followed by an oxidation step with H 2 O or CO 2 between 800°C-1050°C. The comparison of the fuel production rate and yield from the reactive materials highlighted the importance of the material thermal stability during cycling. CTCe and CeF showed a good O 2 and fuel production stability over repeated cycles, while CeFB exhibited a decrease of the production because of sintering and thermal gradient due to its low thermal conductivity. Biomimetic CTCe showed a higher fuel production rate compared to the other investigated materials, explained by the favorable microstructure of the cork-based ceramic. The morphology obtained from the cork structure led to the improvement of the redox activity, demonstrating the relevance of studying this material for thermochemical H 2 O and CO 2 splitting cycles. In addition, the impact of the operating conditions was investigated. A decrease of the starting oxidation temperature, an increase of the CO 2 molar fraction (lower CO:CO 2 ratio) or a high total gas flow rate favoring gas product dilution had beneficial impact on the CO (or H 2) production rate.
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hal-02931743 , version 1 (05-11-2020)

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Anita Haeussler, Stéphane Abanades, Fernando A. Costa Oliveira, M. Alexandra Barreiros, A. P. F. Caetano, et al.. Solar Redox Cycling of Ceria Structures Based on Fiber Boards, Foams, and Biomimetic Cork-Derived Ecoceramics for Two-Step Thermochemical H2O and CO2 Splitting. Energy & Fuels, 2020, 34 (7), pp.9037-9049. ⟨10.1021/acs.energyfuels.0c01240⟩. ⟨hal-02931743⟩
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