Open AccessCOST-EFFECTIVE METHOD FOR PRODUCING SELF SUPPORTED PALLADIUM ALLOY MEMBRANES FOR USE IN EFFICIENT PRODUCTION OF COAL DERIVED HYDROGEN
Author(s) -
B. Lanning,
Jim Arps
Publication year - 2004
Language(s) - English
Resource type - Reports
DOI - 10.2172/828274
Subject(s) - materials science , alloy , foil method , silicon , membrane , hydrogen , substrate (aquarium) , palladium , chemical engineering , wafer , metallurgy , nanotechnology , composite material , chemistry , catalysis , biochemistry , organic chemistry , engineering , oceanography , geology
In continuation of efforts from last quarter, processing parameters, used in the formation of Pd-Cu alloy films, were being optimized in a drum (web) coater system with the goal of producing large-area, contiguous, pinhole-free films for H{sub 2} separation membranes. Since the (pre-treatment) functionality of the surface of the plastic backing material is sub-optimal, they tended to produce films in the drum coater that were either not contiguous (disseminates upon release from the polymer backing material) or contain pinholes. Alternative approaches, such as direct deposition onto thermally oxidized silicon wafers, have been attempted to yield pinhole-free films; i.e., formation of a poorly adherent Pd-Cu film on silicon will then directly release from the silicon substrate. Permeation characteristics of a 25 {micro}m-thick, Pd{sub 60}Cu{sub 40} alloy foil were conducted. After pre-treating the sample to stabilize the FCC {beta}-phase, the hydrogen permeability was determined to be 5.4 x 10{sup -5} cm{sup 3} cmcm{sup -2}s{sup -1}cm Hg{sup -1/2}. Thin, 1-3 {micro}m-thick Pd-Cu alloy films have been prepared on PS films and samples will be prepared and tested in the next quarter