催化剂CeO2和Y2O3对NaAlH4放氢性能的影响

稀有金属材料与工程, 2013, 42(7): 1321-1324.

催化剂CeO2和Y2O3对NaAlH4放氢性能的影响

郑雪萍 ^1, , 肖果 ^2, , 刘胜林 ^3, , 冯鑫 ^4, , 郑姣姣 ^5,

1.长安大学,陕西西安710061

2.长安大学,陕西西安710061

3.长安大学,陕西西安710061

4.长安大学,陕西西安710061

5.长安大学,陕西西安710061

基金项目: Central Key Projects Of Scientific Research in Colleges and Universities Operating Costs(CHD2011ZD008,CHD2010ZY015) National Natural Science Foundation of China(50806007)

关键词： NaAlH4 , CeO2 , Y2O3 , 放氢性能

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

Zheng Xueping ^1, , Xiao Guo ^2, , Liu Shenglin ^3, , Feng Xin ^4, , Zheng Jiaojiao ^5,

1.长安大学,陕西西安710061

2.长安大学,陕西西安710061

3.长安大学,陕西西安710061

4.长安大学,陕西西安710061

5.长安大学,陕西西安710061

Keywords： NaAlH4 , CeO2 , Y2O3 , hydrogen desorption properties

主要研究氩气气氛下通过机械球磨方法制备的掺杂两种稀土氧化物(由0～5mol％CeO2和Y2O3)对NaAlH4放氢性能的影响.PCT测试结果显示,在相同的条件下,两种稀土氧化物引起NaAlH4的最大放氢量和平均放氢速率的规律相似,都随着掺量的增加先增大至某一值后又开始减小.相对于Y2O3,CeO2对NaAlH4的催化效果影响更为突出,达到相同的放氢量4.8wt％时,1 mol％CeO2-NaAlH4的放氢速率明显比1 mol％ Y2O3-NaAlH4要高.SEM分析结果显示,随着催化剂含量的增加,粉体颗粒更加均匀,继而团聚成絮状.同时研究发现,球磨后呈分散结构的颗粒可能比絮状结构颗粒反应接触面积大,且经过加热放氢后的试样有很多类似于蜂窝状的气孔存在.

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