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Redox kinetics of pure and Zr+4 doped CeO2 used for thermochemical hydrogen production

Knoblauch, Nicole and Hoffmann, Lukas and Seeliger, Felix and Simon, Heike and Schmücker, Martin (2017) Redox kinetics of pure and Zr+4 doped CeO2 used for thermochemical hydrogen production. 12th Pacific Rim Conference on Ceramic and Glass Technology, 21-26. Mai. 2017, Hawaii,USA.

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Abstract

Kinetics of pure and Zr+4 doped CeO2, synthesized via Pechini method, was investigated in view of their applicability as redox material for thermochemical hydrogen production. In pure CeO2 several reduced sub-oxide phases were formed after reduction, as evidenced by X-ray diffraction (XRD), scanning electron microscopy (SEM) and energy dispersive spectrometry (EDS). In Zr-doped CeO2 Zr-rich phases were formed at the pellet surface after treatment at high temperature under low partial pressure of oxygen (pO2) which is attributed to selective Ce evaporation. Reduction kinetics between 1543K and 1753K under various pO2 was monitored by Thermogravimetric analyses (TG) using pure and Zr+4 doped CeO2 pellets sintered at different temperatures. TG data show that Zr doping of CeO2 is beneficial in view of reduction but may be thermodynamically detrimental for re-oxidation by water vapor. Evidence suggests that the sintering temperature of Zr-doped CeO2 pellets affects the water-splitting efficiency.

Item URL in elib:https://elib.dlr.de/114717/
Document Type:Conference or Workshop Item (Speech)
Title:Redox kinetics of pure and Zr+4 doped CeO2 used for thermochemical hydrogen production
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Knoblauch, Nicolenicole.knoblauch (at) dlr.deUNSPECIFIED
Hoffmann, Lukasruhr-universität bochumUNSPECIFIED
Seeliger, Felixdlr sf-solUNSPECIFIED
Simon, Heikeheike.simon (at) dlr.deUNSPECIFIED
Schmücker, Martinmartin.schmuecker (at) dlr.deUNSPECIFIED
Date:May 2017
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:CeO2, reduced phases, Zr doping, hydrogen production
Event Title:12th Pacific Rim Conference on Ceramic and Glass Technology
Event Location:Hawaii,USA
Event Type:international Conference
Event Dates:21-26. Mai. 2017
Organizer:The American ceramic Society
HGF - Research field:Energy
HGF - Program:Renewable Energies
HGF - Program Themes:Solar Fuels
DLR - Research area:Energy
DLR - Program:E SW - Solar and Wind Energy
DLR - Research theme (Project):E - Solar Fuels
Location: Köln-Porz
Institutes and Institutions:Institute of Materials Research > Structural and Functional ceramics
Deposited By: Knoblauch, Nicole
Deposited On:20 Oct 2017 13:14
Last Modified:20 Oct 2017 13:14

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