| Summary: | 碩士 === 國立虎尾科技大學 === 材料科學與綠色能源工程研究所 === 98 === 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.
|
|---|
