Preparation of Pd/SAPO-34/PSS composite membranes for hydrogen separation: Effect of crystallization time on the zeolite growth on PSS support

다국어 초록 (Multilingual Abstract)

In this study, palladium composite membranes were fabricated on porous stainless steel (PSS) supports using silicoaluminophosphate (SAPO) zeolite (SAPO-34) as a diffusion barrier and substrate modifier. The vacuum-assisted seeding and secondary growth method was used to coat the SAPO-34 zeolite layer on the PSS substrates. The morphologies and microstructures of the membranes were analyzed by AFM, XRD, BET, ICP–AES, FESEM and EDX techniques. The effect of crystallization time (24, 48 and 72 h) on the morphology and quality of SAPO-34 modified supports was studied. A continuous palladium layer with a thickness of about 9 μm was deposited on the SAPO-34 modified PSS support (72 h crystallization time) by electroless plating (ELP) route. The hydrogen permeation tests were carried out in the feed pressures range of 2–4 bar and various temperatures (623, 673 and 723 K). The values of the hydrogen permeance and ideal selectivity of H2/N2 for the PSM3 membrane were achieved 7.1 × 10–7 mol m–2 s–1 Pa–1 and 866, respectively a feed pressure of 2 bar and 723 K. In addition, the PSM3 membrane showed perfect stability during 260 h hydrogen permeation experiment at a feed pressure of 2 bar and 623 K.

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