Fabrication of novel Pd–Ag–Ru/Al2O3 ternary alloy composite membrane with remarkably enhanced H2 permeability

Preparation and characterization of palladium–ruthenium composite membrane on alumina‐modified PSS substrate

“…At the 3, 5 and 8 wt% addition levels, there was no significant change in hydrogen permeability, that is Ru addition was not able to improve the hydrogen permeability of the membrane. This finding is similar to that of Gade et al, but differs from other studies, likely because of the non‐alloy structure of the Ru/Pd layers.…”

“…Gryaznov et al reported that Pd–Ru (4.5–5 wt%) alloy, in the form of thin‐walled tubes and foils, has a somewhat higher hydrogen permeability than Pd–Ag (23 wt%) alloy, with ∼5 times higher stability than palladium at 823 K. Nam et al tested a 100 µm thick Pd–Ru (5.5 wt%) tubular membrane which had a much higher methane conversion than for similar catalyst loadings without a membrane. Wang et al fabricated Pd–Ag–Ru ternary membranes with 1 wt% ruthenium by simultaneous electroless plating, resulting in three times greater hydrogen permeability than pure palladium and Pd–Ag membranes. However, recent research with Pd–Ru membranes produced by electroless plating reported that a Pd–Ru membrane containing 4.3 wt% ruthenium did not show higher permeability than pure palladium.…”

Pd-Alloy membranes for hydrogen separation

“…Wang observed that Pd 69 Ag 30 Ru 1 displays higher permeability than either Pd or PdAg [53]. This is a notable result because the PdRu binary is less permeable than pure Pd [54].…”

Electroless Plating of Palladium Membranes on Porous Substrates for Hydrogen Separation and the Effects of Process Factors on Plating Rate and Efficiency: A Review

“…This unique ability of the membrane reactor enables an improved performance to be achieved such as an increase in reactant conversion and product selectivity through the removal of one of the products in a dehydrogenation reaction or to perform a hydrogenation reaction by dousing hydrogen through the membrane [3] [4]. This concept can be used in steam methane reforming and other hydrocarbon reactions and it offers several benefits in terms of increasing product conversions and cost reduction [5]. Palladium membranes have infinite selectivity for hydrogen due to their ability to transport hydrogen which is as a result of the very high solubility of hydrogen in the bulk over very wide temperature ranges [2].…”