Solar thermochemical process for hydrogen production via two-step water splitting cycle based on Ce₁₋ₓPrₓO₂₋δ redox reaction
2012
Meng, Qing-Long | Lee, Chong-il | Kaneko, Hiroshi | Tamaura, Yutaka
Ce₁₋ₓPrₓO₂₋δ (x=0, 0.05, 0.1, 0.2 and 0.3), as reactive ceramics synthesized by combustion method for H₂ production via two-step water splitting reaction with concentrated solar energy, was investigated in present work. XRD analysis of the samples shows that Pr₆O₁₁ underwent a phase transition into Pr₂O₃and Pr₂O₃ cannot be oxidized by steam to yield H₂ in two-step water splitting reaction. The solid solutions of the samples containing Ce were formed with a single cubic CeO₂ fluorite structure after synthesis and even after two-step water splitting reaction. Although Pr cannot be oxidized by steam to generate H₂ in two-step water splitting reaction, the promotion effect is present with the introduction of 5mol% and 10mol% Pr into CeO₂ on the amounts of O₂ and H₂, but the volume of H₂ evolved is enhanced or not, strongly dependent on the H₂-generation temperature. The optimum H₂-generation temperature is 1023K.
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