Hydrogen-Purification Membranes and Membrane Test Equipment


Hydrogen permeable metal membranes made of Pd-coated refractory metals or palladium-silver alloy. Palladium silver alloy membranes are available plain, coated with pallaadium-grey, or coated with palladium-copper alloy. Selectivity to hydrogen = 100%. For membrane- reactors, go here; for catalysts, here, and for hydrogen purifiers, go here. Our refractory metal mebranes and membrane test equipment is described below. For a theoretical / experimental article on the mechanism and rate of hydrogen transport through these metal membranes, go here.
Membranes

Tantalum-based hydrogen permeation membranes 3/8" OD x .007" wall coated with 1.5/u Pd 4" or 6" studded lengths. Other lengths available. Graphite ferrules and modified swageloks sold separately.

$1850/4"
$2200/6"

Niobium-based hydrogen permeation membranes 3/8" x .007" wall coated with 1.6/u Pd 4" or 6" studded lengths. Other lengths available. Graphite ferrules and modified swageloks sold separately.

$1350/4"
$1600/6"

Pd-Ag membranes 1/8" OD x .003" wall: plain, coated with Pd, or coated with Pd-Cu. Generally sold sealed at one end and brazed to a stainless steel stub at the other. Standard length=6"+1" stub, 7" total. Selectivity to hydrogen 100%. For specialty versions, go here.

Plain $1350
Pd-coated $1600
Pd-Cu coated $2100

Tube bundle containing 72 Pd-Ag membranes 1/8" OD x .003" wall x 18" tall. Sold brazed into a tubesheet with spacers to hold the membranes and promote proper gas flow. For operation at pressures up to 400 psi and temperatures up to 450 C.

72 tube: $48,500
Membrane Test Equipment

Uniform Temperature Membrane Test Rig for testing the hydrogen permeation rate of metallic or other inorganic membranes. Stainless Steel, 2" Outer diameter by 8" or 18" long. Test volume is 1 1/2" ID with an internal thermocouple well. Includes couter -flow annulus to maintain temperature uniformity. Use with a copper or graphite gasket to test any type of inorganic separation membrane at pressures up to 300 psi and temperatures up to 400 C. See here for description and flows.

8" Chamber $3600
18" Chamber $3850

High Pressure Membrane Test Apparatus, 21" tall by 1.5" outer diameter; 7/8" ID. For use testing membrane flux at pressures up to 600 psi, and temperatures up to 650 C. Seals with a 1" swagelok fitting; fits in our high temperature furnace See here for description and flows..

$3950

Modified Swageloks (drilled out to be bigger) and ten 3/8" graphite ferrules. Very useful for testing 3/8" hydrogen permeation membranes, whether palladium-coated stainless steel, palladium-coated ceramic, or palladium-coated refractory metal.

Union and Cap $350
Cap only $200

Graphite Gaskets for 2 3/8" or 4" Conflat flanges. Same size as standard copper gaskets. Used for sealing conflat flanges at pressures up to 350 psi and temperatuers up to 400 C in Conflat-sealed test apparatae.

Pack of 5/ $250

Periodic Table Coffee cup. Designed by Robert E. Buxbaum, himself. Essential equipment for any membrane research program. Hydrogen appears here twice; once as an alkali metal (HCl) once as a non-metal (NaH). Shows how much extra surface area a cylinder provides by including all the rare-earth metals and lanthanides where they belong. Color = Blue of Tyre, White.

$30.