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SolarSynGas: Results from a Virtual Institute developing Materials and Key Components for Solar Thermochemical Fuel Production

Roeb, Martin und Sattler, Christian und Pitz-Paal, Robert und Feldmann, Claus und Borchardt, Günter und Steinfeld, Aldo (2015) SolarSynGas: Results from a Virtual Institute developing Materials and Key Components for Solar Thermochemical Fuel Production. In: Solar Paces 2015 Book of Abstracts. SolarPACES 2015, 13.-16. Okt. 2015, Kapstadt, Südafrika.

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Kurzfassung

The Helmholtz Virtual Institute (VI) SolarSynGas brings together expertise from solar energy research and materials science to develop metal oxide based redox materials and to integrate them in a suitable way into related process technologies for two-step thermochemical production of hydrogen and carbon monoxide from water and CO2. One of the foci of experimental investigation was exploring the impact of doping on the feasibility of ceria-based materials – mainly by Zr-doping. The results indicate that a certain Zr-content enhances the reducibility and therefore the splitting performance. Increasing the Zr-content to x = 0.15 improved the specific CO2-splitting performance by 50% compared to pure ceria. This finding agrees with theoretical studies attributing the improvements to lattice modification caused by the introduction of Zr4+. Thermogravimetric relaxation experiments and equilibrium oxygen isotope exchange experiments with subsequent depth profiling analysis were carried out on ceria. As a result the reduction reaction of even dense samples of pure ceria with a grain size of about 20 μm is surface reaction controlled. The structure of the derived expression for the apparent activation energy suggests that the chemical surface exchange coefficient should show only a very weak dependence on temperature for ceria doped with lower valence cations. A solar receiver reactor exhibiting a foam-type reticulated porous ceramics made of ceria was tested. It could be shown that applying dual-scale porosity to those foams with mm-size pores for effective radiative heat transfer during reduction and μm-size pores within its struts for enhanced kinetics during oxidation allows enhancing the performance of the reactor significantly. Also a particle process concept applying solid-solid heat recovery from redox particles in a high temperature solar thermochemical process was analysed that uses ceramic spheres as solid heat transfer medium. This concept can be implemented into any particle reactor and offers sufficiently high heat recovery rates and thus high overall system efficiencies. A detailed model to calculate the performance of the concept in consideration of temperature dependent material data and several other influencing factors was developed. It was found that the molar flow ratio needs to be optimized regarding the contact time and the heat recovery rate only increases slightly over a contact time of τ=10s. The system reaches a heat recovery rate over 70% in case of six stages, connected in a quasi-counter-current principle.

elib-URL des Eintrags:https://elib.dlr.de/99213/
Dokumentart:Konferenzbeitrag (Vortrag)
Titel:SolarSynGas: Results from a Virtual Institute developing Materials and Key Components for Solar Thermochemical Fuel Production
Autoren:
AutorenInstitution oder E-Mail-AdresseAutoren-ORCID-iDORCID Put Code
Roeb, MartinMartin.roeb (at) dlr.deNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Sattler, Christianchristian.sattler (at) dlr.deNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Pitz-Paal, Robertrobert.pitz-paal (at) dlr.deNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Feldmann, ClausKITNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Borchardt, GünterTU ClausthalNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Steinfeld, AldoETH ZürichNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Datum:16 Oktober 2015
Erschienen in:Solar Paces 2015 Book of Abstracts
Referierte Publikation:Ja
Open Access:Nein
Gold Open Access:Nein
In SCOPUS:Nein
In ISI Web of Science:Nein
Status:veröffentlicht
Stichwörter:solar syn-gas, hydrogen, concentrated solar, redox cycles, thermochemical cycles, water Splitting, CO2 splitting
Veranstaltungstitel:SolarPACES 2015
Veranstaltungsort:Kapstadt, Südafrika
Veranstaltungsart:internationale Konferenz
Veranstaltungsdatum:13.-16. Okt. 2015
Veranstalter :SolarPACES
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:06 Nov 2015 15:03
Letzte Änderung:06 Nov 2015 15:03

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