Catalytic effect of Gd₂O₃ and Nd₂O₃ on hydrogen desorption behavior of NaAlH₄

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• 作者：Zheng Xueping ; ^{zxp2004b@yahoo.com.cn} ; Xiao Guo ; Liu Shenglin ; Feng Xin ; Zheng Jiaojiao
• 关键词：NaAlH4 ; Gd2O3 ; Nd2O3 ; Hydrogen storage behavior ; Microstructure
• 刊名：International Journal of Hydrogen Energy
• 出版年：2012
• 期刊代码：42_03603199
• 类别：ch
• 出版时间：May, 2012
• 卷：37
• 期：10
• 页码：8402-8407
• 文件大小：1415 K

摘要

This study investigated the effect of Nd₂O₃ and Gd₂O₃ as catalyst on hydrogen desorption behavior of NaAlH₄. Pressure-content-temperature (PCT) equipment measurement proved that both two oxides enhanced the dehydrogenation kinetics distinctly and increasing Nd₂O₃ and Gd₂O₃ from 0.5 mol%to 5 mol%caused a similar effect trend that the dehydrogenation amount and average dehydrogenation rate increased firstly and then decreased under the same conditions. 1 mol%Gd₂O₃-NaAlH₄ presented the largest hydrogen desorption amount of 5.94 wt%while 1 mol%Nd₂O₃-NaAlH₄ exerted the fastest dehydrogenation rate. Scanning Electron microscopy (SEM) analysis revealed that Gd₂O₃-NaAlH₄ samples displayed uniform surface morphology that was bulky, uneven and flocculent. The difference of Nd₂O₃-NaAlH₄ was that with the increasing of Nd₂O₃ content, the particles turned more and more big. Compared to dehydrogenation behavior, this phenomenon demonstrated that small particles structure were beneficial to hydrogen desorption. Besides, the further study found that different catalysts and addition amounts had different effects on the microstructure of NaAlH_4.