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I am building a set-up to produce a controlled flow of dry hydrogen. I'm aiming for around 99.5 percent purity.

Am I right in thinking a PEM cell and Deterite drying tube should be fine for this? Or will I need a condenser of some kind?

Any tips?

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    $\begingroup$ Some links that might be useful for people reading this en.wikipedia.org/wiki/Proton_exchange_membrane_fuel_cell and en.wikipedia.org/wiki/Drying_tube $\endgroup$ – Mithoron Jul 28 '15 at 22:37
  • $\begingroup$ What you should be really careful about is storing it$\ldots$Hydrogen gas is highly explosive (even though its potential energy is well-hidden behind a kinetic barrier) but I guess you already know that. $\endgroup$ – M.A.R. Jul 28 '15 at 22:57
  • $\begingroup$ If you might ultimately need ultra-pure hydrogen, palladium membrane hydrogen purifiers are a simple way to eliminate trace gases. $\endgroup$ – DrMoishe Pippik Jul 31 '15 at 0:52
  • $\begingroup$ For what setting up a fuel cell would costs you can buy high purity hydrogen in a tank. It is a cheap gas to make in production quantities. The expensive part will be the regulator. $\endgroup$ – MaxW Oct 28 '15 at 9:39
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Using molecular sieves comes to my mind, they're easy to use and efficient. You can find some practical information about how this is done for example here http://www.klmtechgroup.com/PDF/Articles/articles/Molecular-Sieve-Applications.pdf

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Hydrogen gas is inert towards most common drying agents, so you could try using a drying tube filled with anhydrous salts like CaCl2, Na2SO4, MgSO4 or you can bubble it through cc.H2SO4. But molecular sieves are also a good bet if you have them.

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