Al2O3基材改質對Pd/Al2O3及PdNi/Al2O3複合膜氫氣選透性能之影響

Effects of The Modification of Al2O3 Substrate on The Hydrogen Permselectivity of Pd/Al2O3 and PdNi/Al2O3 Composite Membranes

黃俊凱(Chun-Kai Huang)

指導教授 ： 蔡定侃

國立虎尾科技大學/工程學院/材料科學與綠色能源工程研究所/碩士(2012年)

摘要

Pd/Al2O3複合膜對氫氣具有良好之選透性及化學和熱穩定性，因而被廣泛應用於氫氣分離與純化中，但鈀膜會有低溫氫脆及成本過高的問題，許多研究指出；鈀基合金膜可改善鈀膜氫脆及降低成本問題。
本研究利用溶膠凝膠法在α-Al2O3基材上披覆孔徑較小之γ-Al2O3及γ-Al2O3(Pd)改質層，形成γ-Al2O3/α-Al2O3、γ-Al2O3(Pd)/α-Al2O3非對稱型基材，改善基材表面粗糙度及活化特性，探討γ-Al2O3及γ-Al2O3(Pd)改質層對無電鍍鈀膜結構、披覆性及Pd/Al2O3複合膜氫氣選透性能之影響。最後，利用無電鍍共析鍍製備PdNi/Al2O3複合膜，探討PdNi/Al2O3複合膜之氫氣選透性能。實驗結果顯示γ-Al2O3及γ-Al2O3(Pd)改質層可有效改善鈀膜在α-Al2O3基材之披覆性，Pd/γ-Al2O3(Pd)/α-Al2O3之氫氣滲透通量在723 K可達0.078289 mole/m2-s，H2/N2選透性約61；Pd95.2Ni4.8/γ-Al2O3(Pd)/α-Al2O3具較佳氫氣選透性能，氫氣滲透通量在723 K可達0.081223 mole/m2-s，其H2/N2選透性可達423。

關鍵字

Pd/Al2O3複合膜 ； PdNi/Al2O3複合膜 ； 氫氣選透性 ； 共析鍍 ； 溶凝膠法

並列摘要

Palladium membranes have been widely applied in hydrogen separation and purification due to their good hydrogen permselectivity, outstanding chemical and thermal stabilities. However, the palladium membrane has some drawbacks in applications of hydrogen purification such as hydrogen embrittlement at low temperature and higher cost. Previous studies have showed that the Palladium-base alloy membranes can solve the hydrogen embrittlement and reduce the cost of Palladium membranes.
The γ-Al2O3 and γ-Al2O3(Pd) modified layers were dip-coated on the α-Al2O3 substrates by using Sol-gel method for improving the roughness and activity of α-Al2O3 substrate. Effects of the γ-Al2O3 and γ-Al2O3(Pd) modified layers on the structure and coverage of Pd membrane, and the hydrogen permselectivity of Pd/Al2O3 composite membrane have been studied. The PdNi/Al2O3 composite membranes were manufactured by a composite electroless deposition for investigating the hydrogen permselectivity of PdNi/Al2O3 composite membrane. Results of this study demonstrated that the γ-Al2O3 and γ-Al2O3(Pd) modified layers can improve effectively the coverage of the Pd membrane. The Pd/γ-Al2O3(Pd)/α-Al2O3 composite membrane had a permeance flux of 0.078289 mole/m2-s and H2/N2 selectivity of 61 at 723 K. The Pd95.2Ni4.8/γ-Al2O3(Pd)/α-Al2O3 composite membrane exhibited higher hydrogen permeance flux and H2/N2 selectivity, a permeance flux of 0.081223 mole/m2-s and H2/N2 selectivity of 423 were obtained at 723 K.

並列關鍵字

Pd/Al2O3 composite membrane ； PdNi/Al2O3 composite membrane ； Hydrogen permselectivity ； composite electroless deposition ； sol-gel method

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