4-4-2 集光太陽熱によるセリア系反応性セラミックスの高酸素分圧下熱還元反応(4-4 太陽熱発電・水素製造2,Session 4 新エネルギー)

概要

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CeO_2-ZrO_2 oxides were synthesized by polymerized complex method at different Ce:Zr molar ratio. The O_2-releasing reaction in air with CeO_2-ZrO_2 oxides was investigated at a high temperature. Different solid solubility (0%, 10%, 20%, 30%) of ZrO_2 in CeO_2 were examined. The largest yield of 2.9 cm^3/g was exhibited at x = 0.2 (Ce_<0.8>Zr_<0.2>O_2) for an O_2 release at 1500℃ in air. The reduced cerium ion in Ce_<0.8>Zr_<0.2>O_2 was about 11%, which is seven times higher than that with CeO2. The optical absorption and luminescence spectra of the CeO_2-ZrO_2 oxide obtained before and after the O_2-releasing reaction suggest that the reduction of Ce^<4+> with formation of oxygen defect in the air.
2012-07-30