The cerium(IV) oxide窶田erium(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: 2 CeO2 竊 Ce2O3 + 0.5 O2
- Hydrolysis: Ce2O3 + H2O 竊 2 CeO2 + H2
For the first endothermic step, cerium(IV) oxide is thermally dissociated in an inert gas atmosphere at 2,000 ﾂｰC (3,630 ﾂｰF) and 100-200 mbar into cerium(III) oxide and oxygen. In the second exothermic step cerium(III) oxide reacts at 400 ﾂｰC (752 ﾂｰF)窶600 ﾂｰC (1,112 ﾂｰF) in a fixed bed reactor with water and produces hydrogen and cerium(IV) oxide.
See also
- Copper窶田hlorine cycle
- Heliostat
- Hybrid sulfur cycle
- HYDROSOL
- Iron oxide cycle
- Solar thermal energy
- Sulfur窶妬odine cycle
- Zinc窶奴inc oxide cycle
References
- ^ "Hydrogen production from solar thermochemical water splitting cycles". Archived from the original on August 30, 2009.
- ^ 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" (PDF). Science. 330 (6012): 1797窶1801. doi: 10.1126/science.1197834. PMID 21205663. S2CID 14494021.