کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
638788 | 1456183 | 2007 | 11 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Measurement and modeling of hydrogen transport through high-flux Pd membranes Measurement and modeling of hydrogen transport through high-flux Pd membranes](/preview/png/638788.png)
The permeability of H2-selective palladium membranes fabricated with microsystem technology has been studied. The permeation experiments have been carried out at temperatures between 623 and 873 K at H2 feed partial pressures of 0.2–1.0 bar. At 823 K, a permeance based on the free membrane area of 18 mol H2/m2 s bar0.58 has been measured for a Pd membrane with a thickness of 0.5 μm. From the permeation experiments the rate determining transport step and the stability of the membranes have been determined. At 873 K the H2/He selectivity decreases rapidly, indicating the formation of pinholes at higher temperatures. From a combination of experiments and computer simulations the limiting transport step has been determined to be H-atom diffusion through the membrane at elevated temperatures and H2 surface reactions at the retentate side at lower temperatures.
Journal: Journal of Membrane Science - Volume 289, Issues 1–2, 15 February 2007, Pages 15–25