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TiF3對氫化燃燒合成Mg95Ni5放氫性能的影響
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國家高技術(shù)研究發(fā)展計劃(“863”計劃-2007AA05Z110);江蘇省科技廳高技術(shù)研究(工業(yè))重大項目(BG2007052);國家自然科學基金項目(50871052)


Effect of TiF3 on the Hydrogen Desorption Property of Mg95Ni5 by Hydriding Combustion Synthesis
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    摘要:

    研究了TiF3的添加對氫化燃燒合成Mg95Ni5放氫性能的影響。添加1%(摩爾分數(shù),下同)TiF3機械球磨10 h可使Mg95Ni5的放氫性能達到最佳,在523 K時,1800 s內(nèi)的放氫量可達到5.20%(質(zhì)量分數(shù),下同),并使放氫反應的表觀活化能從Mg95Ni5的124 kJ/mol降低到86 kJ/mol。研究表明,TiF3的催化作用可歸因于生成的MgF2和Tix+的氫化物減弱了Mg-H鍵。

    Abstract:

    Effect of TiF3 addition as the catalyst on the hydrogen desorption property of Mg95Ni5 composites by hydriding combustion synthesis (HCS) was investigated. Addition of 1% TiF3 (molar fraction) can get the best hydrogen desorption property for Mg95Ni5 mechanically milled for 10 h, which could desorb 5.20% (mass fraction) of H2 in 1800 s at 523 K. The apparent activation energy of hydrogen desorption for Mg95Ni5+1%TiF3 milled for 10 h was decreased to 86 kJ/mol from 124 kJ/mol of Mg95Ni5. Results show that catalytic effect of TiF3 could be attributed to the formation of MgF2 and Tix+ hydrides which destabilize the bonding of Mg-H.

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蔡 浩,顧 昊,朱云峰,李李泉. TiF3對氫化燃燒合成Mg95Ni5放氫性能的影響[J].稀有金屬材料與工程,2010,39(1):50~54.[Cai Hao, Gu Hao, Zhu Yunfeng, Li Liquan. Effect of TiF3 on the Hydrogen Desorption Property of Mg95Ni5 by Hydriding Combustion Synthesis[J]. Rare Metal Materials and Engineering,2010,39(1):50~54.]
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  • 收稿日期:2009-01-15
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