PEM/Palladium Diffusion
Palladium membrane hydrogen purifiers operate via pressure driven diffusion across palladium membranes. Only hydrogen can diffuse through the palladium diffuser. The palladium diffuser can take a number of forms, including an array of tubes, a coiled tube or membrane foil. It comprises a palladium and silver alloy material possessing the unique property of only allowing monatomic hydrogen to pass through its crystal lattice when it is heated above nominally 300oC. The hydrogen gas molecule coming into contact with the palladium membrane surface dissociates into monatomic hydrogen and passes through the membrane. On the other surface of the palladium membrane, the monatomic hydrogen is recombined into diatomic hydrogen.
PEM / Palladium Diffusion Process
Features and Benefits
- Extremely pure hydrogen gas with literally no moisture or oxygen carry over. Purity in excess of 99.99999% can be obtained.
- No routine maintenance required.
- Normal life expectancy of a palladium diffuser in the purifier being around 5 years dependent on the application it is being used for and the level of usage (Source: http://pureguard.net/cm/Library/FAQs.html)
>> Download the full Application Note as PDF
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