CO 2 Decomposition by Oxide Ceramics Intercalated in Layered Compound

Iron oxide polymers intercalated and/or loaded within täniolite have been studied as a CO 2 decomposition medium. Fe 2+ was exchanged for Li + in täniolite, oxidized by air‐bubbling at 60°–70°C. The basic d ‐spacing (13.75 Å in the Li + form) was expanded to give 14.86 Å in the Fe 2+ form. Oxidation by air in the form of suspension gave a 15.3‐Å phase, which was ascribed to formation of magnetite within the interlayer. The interlayer distance of the intercalated phase remained the same upon heating at 300°C. The magnetite–intercalated täniolite was heated to activate in a H 2 and/or H 2 O steam. CO 2 decomposition reactivity at 300°C has been evidenced by evolution of CO gas. The high reactivity for CO 2 decomposition is ascribed to the highly dispersed iron oxide ceramics within the interlayer of täniolite Li[(Mg 2 Li)(Si 4 O 10 )]F 2 n H 2 O.