COST-EFFECTIVE METHOD FOR PRODUCING SELF SUPPORTED PALLADIUM ALLOY MEMBRANES FOR USE IN EFFICIENT PRODUCTION OF COAL DERIVED HYDROGEN

Lanning, B. ; Arps, J.

Southwest Research Institute (United States)

关键词: 08 Hydrogen;    Plastics;    Alloys;    Membranes;    Processing;   

DOI  :  10.2172/828274
RP-ID  :  NONE
RP-ID  :  FC26-03NT41849
RP-ID  :  828274

美国|英语

来源: UNT Digital Library

【 摘 要 】

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.