Palladium-based membranes hydrogen selective membrane

Depending on the type of catalyst adopted, the operating temperatures can vary between 600 K (low-temperature shift catalyst) and 700 K (high-temperature shift catalyst). Because of the relatively high temperatures employed, studies reported in the literature usually refer to the use of inorganic membrane reactors [13-16]. In particular, because palladium and its alloys are extremely selective to hydrogen, many reports discuss work on palladium-based membrane reactors. 

Progress in the field of palladium-based membrane has been driven by their capacity to produce a pure hydrogen stream, owing to infinite hydrogen perm-selectivity with respect to all other gases. On the other hand, some drawbacks limit their commercialization, mainly ... 

Palladium-based dense metallic membranes have been known to be completely selective for hydrogen permeation and are used in commercially available small-scale hydrogen purification units (e.g., Johnson Matthey, 2007 REB Research, 2007 Power + Energy, 2007 ATI Wah Chang, 2007). These hydrogen purification units typically use palladium-alloy... 

Membrane processes are based on the selective transmission characteristics of the membrane material for different molecules, whereby the most effective membranes are usually also the most expensive. For example, the purest hydrogen can be captured by palladium membranes with suitable additives, but their low permeability make it necessary to use large membrane surfaces and high pressures, which result in high costs. 

Palladium-based Selective Membranes for Hydrogen Production... 

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