Chemistry:Cerium(IV) oxide–cerium(III) oxide cycle
The cerium(IV) oxide–cerium(III) oxide cycle or CeO2/Ce2O3 cycle is a two-step thermochemical process that employs cerium(IV) oxide and cerium(III) oxide for hydrogen production.[1] The cerium-based cycle allows the separation of H2 and O2 in two steps, making high-temperature gas separation redundant.
Process description
The thermochemical two-step water splitting process (thermochemical cycle) uses redox systems:[2]
- Dissociation: 2CeO2 → Ce2O3 + 0.5 O2
- Hydrolysis: Ce2O3 + H2O → 2CeO2 + H2
For the first endothermic step, cerium(IV) oxide is thermally dissociated in an inert gas atmosphere at 2,000 °C (3,630 °F) and 100-200 mbar into cerium(III) oxide and oxygen. In the second exothermic step cerium(III) oxide reacts at 400 °C (752 °F)–600 °C (1,112 °F) in a fixed bed reactor with water and produces hydrogen and cerium(IV) oxide.
See also
- Copper–chlorine cycle
- Heliostat
- Hybrid sulfur cycle
- HYDROSOL
- Iron oxide cycle
- Solar thermal energy
- Sulfur–iodine cycle
- Zinc–zinc oxide cycle
References
- ↑ "Hydrogen production from solar thermochemical water splitting cycles". Archived from the original on August 30, 2009. https://web.archive.org/web/20090830011704/http://www.solarpaces.org/Tasks/Task2/HPST.HTM.
- ↑ Steinfeld, Aldo; Haile, Sossina M.; Furler, Philipp; Scipio, Danien; Abbott, Mandy; Falter, Christoph; Chueh, William C. (December 24, 2010). "High-Flux Solar-Driven Thermochemical Dissociation of CO2 and H2O Using Nonstoichiometric Ceria". Science 330 (6012): 1797–1801. doi:10.1126/science.1197834. PMID 21205663. https://authors.library.caltech.edu/21543/2/Chueh.SOM.pdf.
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