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3. Purification
For fuel cells to function properly and last a long time, they need pure hydrogen, with a degree of 3N (99.9%) or higher, and above all free of carbon monoxide (less than 20 ppm molar), hence the need to purify the gas produced by the methods described above. Several processes are available for this purpose, including membrane separation, cryogenics and, most commonly, selective adsorption using porous alumino-silicate materials.
Membranes are barriers a few hundred nanometers to a few millimeters thick which, under the effect of a transfer force, may or may not allow certain components to pass through. Among existing membranes, inorganic, metallic or ceramic membranes, although the most expensive, tolerate the highest flows and are the most resistant (corrosion, pressure, temperature).
Cryogenic separation...
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Impact on the environment
Bibliography
Events
International Association for Hydrogen Energy IAHE http://www.iahe.org
Under the aegis of this association, the World Hydrogen Energy Conference (WHEC) has been held every two years since 1976, one of the world's largest and longest-running hydrogen energy conferences. These conferences are organized in turn by the hydrogen energy community...
Directory
Hydrogen producers and suppliers (non-exhaustive list)
Air Liquide (France)
This international group is involved in numerous projects in France, Europe and North America, particularly in the use of hydrogen in fuel cells. Air Liquide has also set up a subsidiary, Axane, to develop, manufacture and market fuel cells for portable use, stationary applications and equipment for public transport...
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