鈀對氫氣具有良好之滲透選擇性及化學和熱穩定性,在化學工業上被廣泛研究與使用。但鈀膜在571K以下的氫氣環境中,會因氫脆而導致破裂,為了改善鈀膜氫脆及降低成本,鈀基合金膜應用於氫氣之分離純化開始受 到廣泛的注意與研究。 本研究利用無電鍍共析鍍法製備鈀及鈀鎳合金/多孔氧化鋁複合膜。改變不同析鍍抽氣壓力、析鍍時間及不同鎳含量,探討其對鈀鎳複合膜氣體 選透性的影響。 由實驗結果得知,利用抽氣輔助析鍍法進行鈀鎳/氧化鋁複合膜之製備,可提升Pd-9.52 at.% Ni合金膜之選透性,Pd-9.52 at.% Ni合金膜由抽氣壓力0.1 atm降低到0.03 atm,選透性從11.19提升到16.42。Pd-9.52 at.% Ni合金膜隨析鍍時間2小時增至6小時,選透性從7.55提升到15.82,顯示隨析鍍時間增加其選透性隨之增加;Pd-9.52 at.% Ni與Pd-18.91 at.% Ni合金膜經測試,選透性能與純鈀膜的性質相近,此表示鈀鎳合金膜取代純鈀膜是可行 的。
Palladium possesses good hydrogen permselectivity, outstanding chemical and thermal stabilities in hydrogen environment, so it has been studied and applied extensively in chemical industry. The palladium membrane damages when it processes in hydrogen under 571K due to the hydrogen embrittlement. To reduce the hydrogen embrittlement temperature and the cost of Pd membranes, the Palladium-base alloy membranes used for the applications of hydrogen separation and purification have been noticed and researched popularly. In this study, the PdNi alloy films were co-deposited on porous alumina substrates to form the PdNi/Al2O3 composite membranes used the electroless plating by changing plating exhaust pressure, plating time and nickel contents. The effects of plating exhaust pressure, plating time and nickel contents on the H2/N2 permselectivity of PdNi/Al2O3 composite membranes were studied. According to the results of experiments, the suction-assisted electroless deposition can enhance the H2/N2 permselectivity of Pd-9.52 at.% Ni. As the exhaust pressure reduced from 1 atm to 0.03 atm, the H2/N2 permselectivity of Pd-9.52 at.% Ni increased from 11.19 to 16.42. The H2/N2 permselectivity of Pd-9.52 at.% Ni increases with the increase of plating time. When the plating time increased from 2 to 6 hours, the H2/N2 permselectivity upgraded from 11.19 to 15.82. The H2/N2 permselectivities of Pd-9.52 at.% Ni and Pd-18.91 at.% Ni are closed to that of pure palladium, indicated that the PdNi alloy instead of pure palladium as hydrogen separation and purification membrane is feasible.
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