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A Study on Contamination of Hydrogen Permeable Pd- based Membranes  

Han, Jonghee (Fuel Cell Research Center, Korea Institute of Science and Technology)
Yoon, Sung Pil (Fuel Cell Research Center, Korea Institute of Science and Technology)
Nam, Suk Woo (Fuel Cell Research Center, Korea Institute of Science and Technology)
Lim, Tae-Hoon (Fuel Cell Research Center, Korea Institute of Science and Technology)
Hong, Seong-Ahn (Fuel Cell Research Center, Korea Institute of Science and Technology)
Kim, Jinsoo (College of Environment and Applied Chemistry, Kyung Hee University)
Publication Information
Transactions of the Korean hydrogen and new energy society / v.14, no.1, 2003 , pp. 17-23 More about this Journal
Abstract
$H_2$ permeation flux though a $100{\mu}m-thick$ Pd-Ru (6wt%) membrane was measured at various temperatures and pressures. The permeation flux followed the Sievert's law and thus the rate-limiting step of the hydrogen permeation was the bulk atomic diffusion step. The activation energy of the permeation flux was obtained at 17.9 kJ/mol and this value is consistent with those published previously. While no degradation of the permeation flux wasfound in the membrane exposed to the $O_2$ and $CO_2$ environments for 100 hours, the membrane exposed to $N_2$ environment for 100 hours showed the degradation in the $H_2$ permeation flux. The $H_2$ permeation was decreased as the exposure temperature to $N_2$, environment was increased. The $H_2$ permeation flux was fully recovered after the membrane was kept in the $H_2$ environment for certain time. The permeation flux degradation might be caused by the formation of metal nitride on the membrane surface.
Keywords
Pd-Ru membrane; $H_2$ permeation; Membrane contamination;
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