Effects of different silica intermediate layers for hydrogen diffusion enhancement of palladium membranes applied to porous stainless steel support

Abstract

Porous stainless steel (SUS) supports were modified with double intermediate layers, silicalite-1 and γ-alumina, to enhance the hydrogen diffusion of a thin palladium membrane. One of layers, silicalite-1, was prepared using the hydrothermal synthetic method on porous SUS supports. The differences in expansion/contraction behaviors caused by different thermal coefficients of expansion between silicalite-1 and the SUS resulted in a lowering of the durability of the membrane. Intermediates layers of mesoporous MCM-48 powders or commercial spherical non-porous silica particles were then applied to porous SUS supports via aspiration, γ-alumina was introduced by dip-coating, and the Pd membrane was subjected to electro-less plating. H 2 permeance of the Pd membrane (membrane thickness: 11 μm) containing spherical silica particles was around 10 × 10 −6 mol•m −2 •s −1 •Pa −1 at 600 °C, which was higher than that of the Pd membrane (membrane thickness: 7 μm) containing MCM-48. The durability of the Pd membrane containing spherical silica particles was higher than that of the version containing MCM-48 powders. These results suggest that commercial spherical non-porous silica particles will uniformly occupy the pores of the SUS tubes and enhance the H 2 permeance and durability of the Pd membrane.

Effects of Fe doping on preparation of Ti-Si porous membrane via in-situ reactive process

“…It is precisely due to its many unique physical properties that people pay more and more attention to metallic membranes, especially in the field of filtration [7][8][9][10][11]. Therefore, efforts are being made to develop simple, effective and cost-efficient methods to fabricate metallic membranes for the application areas of waste water treatment, aerosol filtration, hydrogen separation, and so on [12][13][14].…”

Intensification of Hydrogen Production: Pd–Ag Membrane on Tailored Hastelloy-X Filter for Membrane-Assisted Steam Methane Reforming

“…Specifically, reproduction by the target method (with the target being the pore size distribution) is characterized via capillary flow porometry (CFP) and surface morphology evolution analysis (via laser-optical confocal microscopy), filling the new support until the desired pore size distribution target is reached. The support was equipped with a γ-Al 2 O 3 interdiffusion barrier to prevent Pd-support interdiffusion (chosen amongst several ceramic barriers developed in previous literature [17,[36][37][38][39][40][41][42][43][44][45][46][47][48][49][50][51]), and the membrane was completed with the Pd-Ag layer via ELP. Subsequently, the permeation properties of the membrane were studied in ideal permeation conditions (H 2 and N 2 ) and CO/H 2 -mixture permeation conditions.…”

Hierarchical structure control of MgAl2O4 porous ceramics and application to organic polymer filtration membrane

“…From the 1980s, porous ceramic membranes including a wide range such as UF membranes and MF membranes were developed, and their applications have been quickly expanding to water treatment, food processing industry, and biotechnology fields. 6,7 Commonly used materials for porous membranes are aluminum oxide (Al 2 O 3 ), 8,9 zirconium oxide (ZrO 2 ), 10,11 titanium dioxide (TiO 2 ), 11 zeolite, 12 as well as non-ceramics materials such as stainless steel (SUS), 13 glass, 14 and so on.In general, since ceramics do not have excellent toughness, the porous ceramic membranes are often prepared with a hierarchical structure consisting of a support layer, an intermediate layer, and a membrane layer. A membrane…”