臺灣博碩士論文加值系統

鎂合金材料具有許多優異的特性，例如比強度高、抑震性能佳、良好的電磁遮蔽效果等；因此，隨著輕量化的優勢，以鎂合金製成的零組件，已逐漸地被運用於交通工具上。除此之外，許多個人行動電子產品的零組件也大量地使用鎂合金的製品。基於這些原因，鎂合金廢料將逐日增多，因此，廢棄物資源之處理方式將會成為鎂合金於未來發展的重要課題之一。有鑒於此，本研究以鎂合金廢料或具有防蝕鍍膜而難以回收的鎂合金廢料為製氫材料，使其轉換為一種無二次污染之能源。

本研究使用鎂合金廢料(low-grade Mg scraps)與有機酸，有系統地研究不使用觸煤而產氫的方法。鎂合金耦片於海水溶液中產氫，不鏽鋼網有著觸媒的功用，明顯提升了氫氣累積總量；但鎂合金耦片在含有檸檬酸的海水溶液中產氫，卻沒有觸媒的功用。鎂合金廢料於檸檬酸中產氫，當海水中的檸檬酸濃度為30 wt%時，擁有最大的氫氣累積總量。並計算從含檸檬酸的海水溶液中，產生氫氣的活化能。由於氫離子的移動性與濃度影響了氫氣產生，最大的氫氣累積總量產生於居中的檸檬酸濃度上。氯化鈉濃度對於檸檬酸溶液中的產氫，有著強烈的影響；但是氯化鈉濃度對於醋酸溶液中的產氫，卻沒有影響。雖然15 wt%醋酸溶液與15 wt%檸檬酸溶液，有幾乎相等的可解離氫離子數，但是鎂合金廢料於15 wt%醋酸溶液中的產氫速率，明顯勝過15 wt%檸檬酸中的產氫速率。

Due to excellent properties such as excellent vibration damping property, high specific strength and EMI (electromagnetic interference), in transportation vehicle (e.g., engineering covering, oil pan, door frame wheel, etc) and the outer shell of 3C electric products (e.g., the outer covering of personal mobile communication tool, the upper cover and base seat of notebook computer, etc.), magnesium alloys has an increasing number of uses. Recycling of magnesium scraps (i.e., end-of-life or post-consumed magnesium products) has become increasingly important. The study proposes a method for generating hydrogen gas in citric acid-added seawater by the hydrolysis of magnesium scraps.

The study systematically investigates a catalyst-free method of producing hydrogen using low-grade magnesium scraps (LGMS) in aqueous organic acids. The stainless steel (S.S) net, functions as a catalyst of hydrogen production for LGMS plate in seawater, obviously improve the hydrogen yield, but losing the function of catalyst in citric acid-added seawater. The hydrogen yield was highest when the concentration of citric acid is at 30 wt%, while magnesium plate was placed in citric acid-added seawater. Activation energy for the H2 generation in citric acid-added seawater was calculated. The mobility and concentration of hydrogen ions in citric acid aqueous affect the total hydrogen yield, causing that the highest yield occurred at some intermediate citric acid concentration. The concentration of sodium chloride strongly effects on hydrogen yield in citric acid solution but without the effect on the hydrogen yield in acetic acid solution. The hydrogen generation rate from the magnesium scraps in 15 wt% acetic acid solution obviously exceeded that in 15 wt% citric acid solution, although the two organic solutions each had approximately equal moles of dissociable hydrogen atoms.

總目錄
中文摘要..........................................I
英文摘要.........................................II
總目錄...........................................IV
表目錄...........................................VI
圖目錄..........................................VII
第一章 緒論.......................................1

第二章 文獻回顧...................................2
2-1 氫能的需要...................................2
2-2 化石燃料的消耗與環境污染.....................2
2-3 使用氫能的原因與技術.........................6
2-3-1 氫的多用途性...............................6
2-3-2 氫能使用技術...............................6
2-4 氫能系統.....................................8
2-4-1 氫氣生產...................................8
2-4-2 氫能的輸送、儲存與分佈.....................9
2-4-3 氫能的最終用途............................10
2-5 能源系統的比較..............................11
2-5-1 化石燃料系統..............................11
2-5-2 煤/合成的化石燃料系統.....................12
2-5-3 太陽-氫能系統.............................12
2-6 鎂合金廢料製氫..............................13

第三章 實驗......................................33
3-1 鎂合金廢料與鎂合金片........................33
3-2 產氫試片製作................................33
3-3 產氫方式與流程..............................34
3-4 觸媒對於提升產氫速率的測試..................34
3-5 更換產氫溶液對於觸媒效能的影響之測試........35
3-6 不同類型鎂合金的產氫效能測試................35
3-7 更換新鮮溶液對於產氫效率的測試..............35
3-8 檸檬酸濃度對於產氫效率的測試................36
3-9 氯化鈉濃度對於產氫效率的測試................36
3-10 檸檬酸溶液的導電度量測.....................36
3-11 活化能分析.................................36
3-12 規格化產氫量之分析.........................37
3-13 三種有機酸的產氫測試.......................37
3-14 醋酸為產氫溶液的測試.......................38

第四章 結果與討論................................44
4-1 觸媒對於鎂合金在海水中產氫的影響............44
4-1-1 鎂合金片與鎂合金耦片產氫..................44
4-1-2 增加鎂合金耦片的數量產氫..................44
4-2 觸媒對於鎂合金在檸檬酸溶液中產氫的影響......45
4-3 不同類型的鎂合金對於產氫的影響..............46
4-3-1 鎂廢料產氫................................46
4-3-2 鎂廢渣產氫................................47
4-3-3 不同類型鎂合金產氫的比較..................47
4-4 更換新鮮溶液對於產氫的影響..................48
4-5 溶質濃度與氫氣累積總量的關係................49
4-5-1 海水添加不同濃度的檸檬酸產氫..............49
4-5-2 檸檬酸產氫與檸檬酸導電度的量測............51
4-5-3 氯化鈉濃度對於鎂合金在檸檬酸中產氫的影響..53
4-6 氫氣累積總量的影響因素......................54
4-6-1 海水添加檸檬酸產氫的活化能................54
4-6-2 海水添加檸檬酸產氫後的規格化產氫量........55
4-6-3 最大產氫量與檸檬酸濃度的關係..............56
4-7 醋酸、草酸、檸檬酸的產氫測試................57
4-8 醋酸添加不同濃度的氯化鈉產氫................57
4-9 醋酸與檸檬酸產氫的比較......................58

第五章 結論......................................85

參考文獻.........................................87

個人著作.........................................96

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