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

Call, Friedemann und Roeb, Martin und Sattler, Christian und Schmücker, Martin und Bulfin, Brendan und Shvets, Igor (2014) Equilibrium-reduction of ceria-based materials for solar fuel production. Elsevier Materials Today Asia 2014 Conference, 2014-12-09 - 2014-12-12, Kowloon, Hong Kong.

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Kurzfassung

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.

elib-URL des Eintrags:https://elib.dlr.de/94291/
Dokumentart:Konferenzbeitrag (Vortrag)
Titel:Equilibrium-reduction of ceria-based materials for solar fuel production
Autoren:
AutorenInstitution oder E-Mail-AdresseAutoren-ORCID-iDORCID Put Code
Call, Friedemannfriedemann.call (at) dlr.deNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Roeb, MartinMartin.roeb (at) dlr.deNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Sattler, Christianchristian.sattler (at) dlr.dehttps://orcid.org/0000-0002-4314-1124NICHT SPEZIFIZIERT
Schmücker, MartinMartin.Schmuecker (at) dlr.deNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Bulfin, Brendanbulfinb (at) tcd.ieNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Shvets, Igorivchvets (at) tcd.ieNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Datum:9 Dezember 2014
Referierte Publikation:Nein
Open Access:Ja
Gold Open Access:Nein
In SCOPUS:Nein
In ISI Web of Science:Nein
Status:veröffentlicht
Stichwörter:redox cycles, ceria, solar fuel, CSP, hydrogen, Synthesis gas
Veranstaltungstitel:Elsevier Materials Today Asia 2014 Conference
Veranstaltungsort:Kowloon, Hong Kong
Veranstaltungsart:internationale Konferenz
Veranstaltungsbeginn:9 Dezember 2014
Veranstaltungsende:12 Dezember 2014
Veranstalter :Elsevier
HGF - Forschungsbereich:Energie
HGF - Programm:Erneuerbare Energie
HGF - Programmthema:Konzentrierende Solarsysteme (alt)
DLR - Schwerpunkt:Energie
DLR - Forschungsgebiet:E SF - Solarforschung
DLR - Teilgebiet (Projekt, Vorhaben):E - Solare Verfahrenstechnik (alt)
Standort: Köln-Porz
Institute & Einrichtungen:Institut für Solarforschung > Solare Verfahrenstechnik
Hinterlegt von: Sattler, Prof. Dr. Christian
Hinterlegt am:08 Jan 2015 09:27
Letzte Änderung:24 Apr 2024 20:00

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