High-flux H2 separation membranes from (Pd/Au)n nanolayers

✍ Scribed by Lei Shi; Andreas Goldbach; Hengyong Xu

• Publisher: Elsevier Science
• Year: 2011
• Tongue: English
• Weight: 436 KB
• Volume: 36
• Category: Article
• ISSN: 0360-3199
• DOI: 10.1016/j.ijhydene.2010.11.056

✦ Synopsis

A novel strategy for the preparation of supported PdAu alloy layers allows the facile and fast fabrication of highly permeable and selective H 2 separation membranes from refractory metals via electroless plating and low-temperature alloying. Homogenous alloying of multiple, separately deposited Pd and Au layers with thickness in the nm range required less than one week at 773 K under atmospheric H 2 as evidenced by X-ray diffraction and H 2 permeation measurements. The H 2 permeation rate J H2 became stable within a day even, reaching 0.62 mol m À2 s À1 at 773 K and DP H2 ¼ 100 kPa. The corresponding N 2 leak rate remained constant during a 350 h experiment, resulting in an ideal H 2 /N 2 selectivity of 1400 and demonstrating that such membranes tolerate extended operation at that temperature well.