Effect of CeO₂ and Y₂O₃ as Catalysts on Hydrogen Desorption Properties of NaAlH₄

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• 作者：Zheng Xueping ; Xiao Guo ; Liu Shenglin ; Feng Xin ; Zheng Jiaojiao
• 关键词：NaAlH4 ; CeO2 ; Y2O3 ; hydrogen desorption properties
• 刊名：Rare Metal Materials and Engineering
• 出版年：July, 2013
• 年：2013
• 卷：42
• 期：7
• 页码：1321-1324
• 全文大小：2702 K

文摘

The effect of two rare earth oxides (0, 0.5, 1, 2, 3, 4, 5 mol% CeO₂ and 0, 0.5, 1, 2, 3, 4 mol% Y₂O₃) on hydrogen desorption of NaAlH₄ by mechanical milling under an atmosphere of argon was studied. The PCT result reveals that increasing content of CeO₂ and Y₂O₃ causes a similar effect trends on the maximum dehydrogenation amount and the dehydrogenation rate which increases firstly and then decreases under the same moderate conditions. CeO₂ as the catalyst for NaAlH₄ presents superior catalytic activity to Y₂O₃. For the same amount of 4.8 wt%, the dehydrogenation rate of that of 1 mol% CeO₂-NaAlH₄ is obviously faster than that of 1 mol% Y₂O₃-NaAlH₄. SEM analysis shows that with the increasing of catalyst content, the microscopic surface morphology of all the samples changes from homogeneous to flocculent. Besides, the dispersive particle structure may have a bigger reaction area than the flocculent structure and heating could make NaAlH₄ form a kind of porous structure like honeycomb.