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Equilibrium-reduction of ceria-based materials for solar fuel production

Call, Friedemann and Roeb, Martin and Sattler, Christian and Schmücker, Martin and Bulfin, Brendan and Shvets, Igor (2014) Equilibrium-reduction of ceria-based materials for solar fuel production. Elsevier Materials Today Asia 2014 Conference, 9.-12. Dez. 2014, Kowloon, Hong Kong.

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very broad variety of chemical substances like gaseous and liquid synthetic fuels, polymers, ammonia, etc. Employing concentrated solar energy may be a viable alternative to the state-of-the-art methods in order to cover the required heat demand for the generation of carbon monoxide (CO) solely from carbon dioxide (CO2). This emission-free CO production may be carried out in a two-step thermochemical cycle using a metal oxide as the reactive material. Due to preliminary theoretical studies as well as reported in the literature, ceria-based materials are viable candidate materials for such cycles. In screening campaigns, the performance of ceria was enhanced via doping with zirconium and trivalent lanthanides. The most promising compositions were subjected to equilibrium reduction experiments under varying conditions. Within a physical reaction model, the function of the reduction extend on temperature and partial pressure of oxygen was described. Based on the derived relations, Ellingham diagrams were established that convey the reduction enthalpy and entropy as a function of the reduction extend. Employing these functions in a process model, which considers the major losses, maximum solar-to-fuel efficiencies of pure ceria as well as of the doped materials were estimated. A parametric study, including partial pressure of oxygen, temperature, heat recuperation and concentrating system, revealed solar-tofuel efficiencies of the doped materials to be twice as high compared to pure ceria. Suitable Doping improves the efficiency, in particular, at a temperature as low as 1200°C, which should facilitate the technical realization of the process considerably.

Item URL in elib:https://elib.dlr.de/94291/
Document Type:Conference or Workshop Item (Speech)
Title:Equilibrium-reduction of ceria-based materials for solar fuel production
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Call, Friedemannfriedemann.call (at) dlr.deUNSPECIFIED
Roeb, MartinMartin.roeb (at) dlr.deUNSPECIFIED
Sattler, Christianchristian.sattler (at) dlr.deUNSPECIFIED
Schmücker, MartinMartin.Schmuecker (at) dlr.deUNSPECIFIED
Bulfin, Brendanbulfinb (at) tcd.ieUNSPECIFIED
Shvets, Igorivchvets (at) tcd.ieUNSPECIFIED
Date:9 December 2014
Refereed publication:No
Open Access:Yes
Gold Open Access:No
In ISI Web of Science:No
Keywords:redox cycles, ceria, solar fuel, CSP, hydrogen, Synthesis gas
Event Title:Elsevier Materials Today Asia 2014 Conference
Event Location:Kowloon, Hong Kong
Event Type:international Conference
Event Dates:9.-12. Dez. 2014
HGF - Research field:Energy
HGF - Program:Renewable Energies
HGF - Program Themes:Concentrating Solar Systems (old)
DLR - Research area:Energy
DLR - Program:E SF - Solar research
DLR - Research theme (Project):E - Solar Process Technology (old)
Location: Köln-Porz
Institutes and Institutions:Institute of Solar Research > Solare Verfahrenstechnik
Deposited By: Sattler, Prof. Dr. Christian
Deposited On:08 Jan 2015 09:27
Last Modified:31 Jul 2019 19:51

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