Hydrogen purifier

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A hydrogen purifier is a device to purify hydrogen if hydrogen production is done from hydrocarbon sources, the ultra-high purified hydrogen is needed for applications like PEM fuel cells . Different methods are used but the most promising technique for removing unwanted contaminants uses dense thin-metal membrane purifiers which are compact, relatively inexpensive and simple to use.[1]

Palladium membrane hydrogen purifiers[edit]

The palladium membrane is typically a metallic tube of a palladium and silver alloy material possessing the unique property of allowing only monatomic hydrogen to pass through its crystal lattice when it is heated above 300°C.[2]

Pressure swing adsorption[edit]

Pressure swing adsorption is used for the removal of carbon dioxide (CO2) as the final step in the large-scale commercial synthesis of hydrogen. It can also remove methane, carbon monoxide, nitrogen, moisture and in some cases, argon, from hydrogen.

Catalytic recombination or deoxygenation purifier[edit]

Catalytic recombination or deoxygenation is used to remove oxygen (O2) impurities. The process is also known as a 'deoxo' process. The oxygen reacts with the hydrogen to form water vapor, which can then be removed by a dryer if necessary. The catalysts that are used are based on platinum group metals (PGM). A typical system could handle up to 3% O2 in H2 in the feed, and reduce the O2 content to less than 1ppm.[3]

Applications[edit]

Hydrogen purifiers are used in metalorganic vapour phase epitaxy reactors for LED production.[4]

See also[edit]

References[edit]

External links[edit]