氧化物催化劑對亞共晶Mg-Ni合金之儲放氫特性研究

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姓名

高裕欽(Yu-chin Kao) 查詢紙本館藏

畢業系所

機械工程學系

論文名稱

氧化物催化劑對亞共晶Mg-Ni合金之儲放氫特性研究
(Catalytic effects of oxide on hydrogen storage characteristic of hypoeutectic Mg-Ni alloy)

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摘要(中)

本研究擬利用鑄造法製備亞共晶Mg-15 Ni合金，而後於球磨過程中將氧化物催化劑添加至亞共晶Mg-15Ni合金中，研究氧化物催化劑對亞共晶Mg-15Ni合金儲放氫特性之影響。
由X光繞射分析結果顯示，鑄態Mg-15Ni合金為Mg及Mg2Ni兩相所構成，經球磨後其繞射峰均有明顯寬化及弱化現象，而球磨中添加氧化物於Mg-15Ni合金中亦可觀察繞射峰均有明顯寬化及弱化的現象，此外也可發現微弱的氧化物繞射峰。在活化循環上，顯示添加氧化物不需長時間活化即有吸氫反應發生，以添加Cr2O3、Fe2O3效果較為明顯；在250、300 ℃儲放氫測試下，添加氧化物催化劑於Mg-15Ni合金中對吸放氫量及吸氫速率皆有所提升，然而在300 ℃下亦具有提高放氫速率與放氫比率之效果，但在250 ℃下的放氫速率仍有相當成效的效果，顯示於250 ℃下添加氧化劑並無法有效改善放氫速率。

摘要(英)

This research plans to utilize casting method to prepare hypoeutectic
Mg-15Ni alloy, and then adds the oxide catalysts in hypoeutectic Mg-15Ni alloy by ball milled, studies the oxide catalysts to influence on hydrogen storage characteristic of hypoeutectic Mg-15Ni alloy.
As-cast Mg-15Ni alloy is formed by Mg and Mg2Ni two phase by the
X-rays diffraction analysis, its diffraction peaks after the ball milled are obviously broaden and weaken , and adds oxides by ball milled can also observe diffraction peak it has to be obviously broadener and weakener than As-cast Mg-15Ni alloy , in addition can find the faint oxide diffraction peak. At activation circulation, reveals addition oxide catalyst can take place to react with hydrogen promptly without activation for a long time , and effect of Cr2O3, Fe2O3 is obviously outstanding; and during pressure-composite-isothermal test at 250,300 ℃, reveals addition the oxide catalyst enhances the absorption /desorption capacity and increases hydriding/dehydriding rate for Mg-15Ni alloy, however adding the oxide catalyst enhances desorption rate and desorption ratio at 300 ℃, but a little effect for enhancing desorption rate at 250 ℃,show that addition the oxide catalyst can not improve desorption rate effectively at 250 ℃ .

關鍵字(中)

★ 儲氫合金
★ 亞共晶Mg-Ni合金
★ XRD
★ 吸放氫速率

關鍵字(英)

★ absorption/desorption rate
★ hydrogen storage alloy
★ hypoeutectic Mg-Ni alloy
★ XRD

論文目次

一、前言與文獻回顧...................................1
1.1 前言.............................................1
1.2 儲氫合金發展簡介 ...............................2
1.3 儲氫合金種類與介紹 ...........................3
1.4 儲氫合金吸放氫原理概述...........................7
1.4.1.動力學特性.......................................7
1.4.2 熱力學特性.......................................9
1.5 研究背景與目的..................................12
二、實驗步驟與方法..................................14
2.1 製備MN(Mg-15Ni)合金流程.........................16
2.2 球磨製備MN(Mg-15Ni)+5wt.% MexOy合金流程..........16
2.3 X 光粉末繞射分析(X-Ray powder diffraction，XRD)...16
2.4 雷射光粒徑分析儀................................16
2.5 掃描式電子顯微鏡微結構觀察......................17
2.6 儲放氫特性測試..................................17
三、結果與討論......................................18
3.1 合金結構XRD分析................................18
3.2 粒徑分析 .......................................19
3.3 SEM分析.........................................20
3.4 儲放氫特性分析..................................22
3.4.1 活化測試........................................22
3.4.2 吸放氫速率測試..................................25
3.5 儲放氫後粒徑分析................................36
四、結論............................................37
五、未來研究與方向..................................38
六、參考文獻........................................39

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指導教授

李勝隆(Sheng-long Lee)

審核日期

2008-7-18

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