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.

Simplified diagram of the cerium(IV) oxide–cerium(III) oxide cycle

Process description

The thermochemical two-step water splitting process (thermochemical cycle) uses redox systems:[2]

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

References
  1. "Hydrogen production from solar thermochemical water splitting cycles". Archived from the original on August 30, 2009.
  2. 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.
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