Patent ID: 7144444
Filing Date: 2006-12-05
Classification: B01D,C01B,Y10S

Abstract:
1. A hydrogen separation membrane comprising a hydrogen permeable portion of said membrane for separating hydrogen in a mixed gas by causing said hydrogen to selectively permeate, wherein said hydrogen permeable portion comprises: a) a first alloy layer comprising Pd and a rare earth element; b) a second alloy layer comprising Pd and Ag; and c) a third alloy layer comprising Pd and Ag, wherein b) and c) are disposed on opposite surfaces of a) and the etching selection ratio of the allow layer c) is greater than that of the alloy layer a), and characterized in that: said hydrogen permeable portion further comprises a plurality of pits arranged in the allow layer c) such that said hydrogen permeable portion comprises a thick-wall portion of alloy layers a), b) and c) and a thin-wall portion of alloy layers a) and b), which is formed in a predetermined pattern between said thick-wall portions and has a thickness less than that of said thick-wall portion.