Hydrogen purifier

From Wikipedia, the free encyclopedia

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 .

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.[1]

Dense thin-metal membrane purifier[edit]

Dense thin-metal membrane purifiers are compact, relatively inexpensive and simple to use.[2][3][4]

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.[5]

Electrochemical purifier[edit]

The electrochemical purifier works similar to a fuel cell, a voltage is applied to the membrane and the resulting electric current pulls hydrogen through the membrane. A well designed system can simultaneously compress the hydrogen.


Hydrogen purifiers are used in metalorganic vapour phase epitaxy reactors for LED production.[6]

See also[edit]


  1. ^ "Advanced palladium membrane scale-up for hydrogen separation" (PDF). Archived from the original (PDF) on 2014-11-29. Retrieved 2014-11-20.
  2. ^ Hydrogen purification membranes
  3. ^ Dense metal membranes for hydrogen purifying
  4. ^ Development of Pd Alloy hydrogen separation membranes with dense-porous hybrid structure for high hydrogen perm-selectivity
  5. ^ 45 Home Power #67 • October / November 1998
  6. ^ Hydrogen purifiers proving vital to LED production

External links[edit]