Thin and defect-free Pd-based composite membrane without any interlayer and substrate penetration by a combined organic and inorganic process

Abstract

A novel combined organic and inorganic process for preparing thin supported membrane was developed, using which a thin and defect-free Pd membrane with uniform thickness of 5 microm was directly coated onto porous alpha-Al2O3 hollow fiber without any interlayer and substrate penetration; at the same time, there existed a small interstice between membrane and substrate, which led to higher hydrogen permeance, infinite selectivity, and better membrane stability.

Ultrathin palladium membranes prepared by a novel electric field assisted activation

“…Membranes made of palladium, and also nickel and platinum, which belong to group 10, and some metallic elements in groups 3-5 of the periodic table have the ability to dissociate and dissolve hydrogen. Considerable research has been carried out on the preparation of palladium-based membranes due to their high solubility of hydrogen in its bulk over a wide temperature range and a fast surface reaction on the metal surface [5,7,8]. For practical applications, in addition to high hydrogen flux and selectivity, and a steady performance over a long period of time, the membranes must have a low cost, and hence a thin Pd layer (<2 m) [9][10][11][12][13].…”

Preparation of thin Pd-based composite membrane on planar metallic substrate

“…Hence, it is relatively easy to achieve a thinner and pinhole-free film on the ceramic substrate by electroless plating. Tong et al [33] prepared a Pd composite membrane on Al 2 O 3 hollow fibre, coincidently with a Pd thickness identical to that of Membrane C. Membrane C had a similar permeation flux under the same conditions, even though the substrate for Membrane C was PSS. Tong et al also reported [3] a composite membrane on an asymmetric PSS substrate with a thinner (3 m) Pd film, but the membrane permeation flux was almost the same as for our 5 m Pd composite membrane.…”

Supported room temperature ionic liquid membranes for CO2/CH4 separation

“…Imidazolium-based task-specific ionic liquids on porous hydrophilic polytetrafluoroethylene support 800 7.7 × 10 −9 55 [21] Imidazolium-based ionic liquids in polysulfone support 330-740 7.3 × 10 −10 to 1.6 × 10 −9 4.7-6.0 [28] Imidazolium-based ionic liquids in polyethersulfone microfiltration support 360-980 8.0 × 10 −10 to 2.2 × 10 −9 6.6-10 [6] Phosphonium-based ionic liquids supported on glass fiber disk filters 544-1700 2.8 × 10 −10 to 8.8 × 10 −10 12-13 [27] Supported ionic liquid membranes on poly vinylidene fluorolide support 94-750 2.1 × 10 −10 to 1.7 × 10 −9 5.7-23 [18] Imidazolium-based supported ionic liquid membranes on PES porous disk support 310-740 7.9 × 10 −10 to 1.9 × 10 −9 10-27 [29] Imidazolium-based fluoroalkyl-functionalized supported room-temperature ionic liquid membranes on porous polyethersulfone support 210-320 4.9 × 10 −10 to 7.4 × 10 −10 13-19 [22] Supported ionic liquid membranes prepared on polyvinylidene fluorolide support 6 5.0 × 10 −11 30 [30] Imidazolium-based SILMs on porous hydrophilic polyethersulfone 610-1050 1.3 × 10 −9 to 2.3 × 10 −9 11-20 [8] that several aminopyridinium compounds are thermally stable to at least 550 K [17]. The option of dissolving one ionic liquid with a particular functionality in a bulk ionic liquid with well defined physical properties offers another avenue for obtaining membranes suitable for certain separations.…”

“…The ionic liquids: 1-butyl-1-methylpyrrolidinium bis(trifluoromethylsulfonyl)imide, 1-hexyl-3-methylimidazolium bis(trifluo- [27] 150 [27] romethylsulfonyl)imide, and methyltrioctylammonium bis(trifluoromethylsulfonyl)imide were purchased from EMD Chemicals, 1-butyl-4-methylpyridinium tetrafluoroborate from Alfa Aesar, and 1-aminopyridinium iodide from Sigma-Aldrich. Trihexyltetradecylphosphonium dicyanamide was kindly provided by Cytec Industries Inc.…”