Thin Pd membrane on a modified porous stainless steel tube: Al₂O₃ particle size selection strategy

摘要

Palladium (Pd) membranes for hydrogen separation were deposited on modified porous stainless steel (PSS) tubes using the electroless plating technique. This study explores the hydrogen permeance influenced by the effect of reducing the thickness of the Pd membrane using different sizes of Al₂O₃ particles, 10 and 1 µm, to modify the pores on the PSS surface. The pore size on the surface of the PSS tubes modified with 10 µm Al₂O₃ particles decreased from 10  20 µm to less than 5 µm, while the surface of the PSS, modified by 1 µm Al₂O₃, was very dense and smooth. Generally, the supporting tubes with smaller pore size on the surface give thinner Pd membrane. The minimum thickness of a dense Pd membrane decreased from 35.1 to 16.2 µm when using 1 µm Al₂O₃ particles to modify the PSS tubes, but the maximum hydrogen permeance was enhanced from 15.3 to 34.7 m3/m2 h atm0.5 at 500°C by using 10 µm Al₂O₃ particles. This evidence demonstrated the hydrogen permeance has a trade-off between the porosity (effective passages) and thickness of the Pd membranes since both are influenced by the Al₂O₃ particle size used in the surface modification. These results suggested a promising and simple approach to produce a Pd membrane with high hydrogen permeance.View full textDownload full textKeywordshydrogen, palladium membrane, electroless plating, porous stainless steelRelated var addthis_config = { ui_cobrand: "Taylor & Francis Online", services_compact: "citeulike,netvibes,twitter,technorati,delicious,linkedin,facebook,stumbleupon,digg,google,more", pubid: "ra-4dff56cd6bb1830b" }; Add to shortlist Link Permalink http://dx.doi.org/10.1080/02533839.2011.552965