Most comparisons put solid-state storage against a compressed cylinder. That is not the decision a serious buyer is making. The real question is which carrier to use — a magnesium hydride bed, methanol, or ammonia — and the three fail in completely different places. This page includes the place ours fails.
Methanol and ammonia are relay routes. Neither delivers hydrogen; each delivers a chemical that must be converted back into hydrogen at the destination, with a reactor, a heat source and a separation step. Solid-state magnesium is a direct route: what comes out of the bed is hydrogen.
That single difference drives most of the table below, and it explains why these routes are not really competitors — they win at different distances.
| Solid-state magnesium | Methanol | Ammonia | |
|---|---|---|---|
| What arrives | Hydrogen | Methanol — must be reformed | Ammonia — must be cracked |
| Released product | Pure hydrogen | Hydrogen + CO₂ | Hydrogen + N₂, needs separation |
| Storage condition | Ambient temperature and pressure | Liquid at ambient | Liquid under modest pressure |
| Heat to release | High — our published work is at 375 °C; industry target 160–200 °C | Reforming, roughly 200–300 °C | Cracking, roughly 400–500 °C |
| Safety character | No stored pressure energy; hydrogen chemically bound | Flammable liquid, toxic if ingested | Toxic and corrosive — usually the dominant constraint |
| Long-distance shipping | Poor — it is heavy | Good; uses existing liquid-fuel logistics | Best; the cheapest way to move hydrogen far |
| Carbon at release | None | Releases CO₂ by chemistry, not by accident | None, but cracking energy is significant |
Magnesium storage is heavy, and the arithmetic is not flattering. At the 6.15–6.89 wt% our catalysed systems reach in the peer-reviewed work, storing one tonne of hydrogen needs roughly 15 tonnes of storage material — before the vessel, the heat exchanger and the thermal mass. Ammonia is 17.6 wt% hydrogen by molecular weight and liquefies under modest pressure. On a ship, that is not a close contest.
| If your problem is… | The answer is probably… |
|---|---|
| Moving hydrogen between continents | Ammonia. Not us. |
| Using existing liquid-fuel logistics, CO₂ acceptable | Methanol. Not us. |
| Stationary storage at a site that needs pure hydrogen | Solid-state. |
| Buffering a refuelling station between demand peaks | Solid-state, if you can supply heat. |
| Storing curtailed wind or solar on site | Solid-state — see the curtailment page. |
| Enclosed space where toxicity or pressure disqualifies | Solid-state. |
We do not sell a storage system, and we do not sell ammonia or methanol technology. We supply the Pd/MWCNT catalyst that goes into the magnesium, and it exists because of the kinetics line above: 446 s absorption and 735 s desorption at 375 °C, desorption activation energy cut from 132.7 to 98.5 kJ/mol. Citations, DOIs and journal standing are here. Those are laboratory figures on ECAP- and HEBM-processed composites, not a system guarantee, and we say so on every page that quotes them.
For moving hydrogen long distances, yes, and we will say so. Ammonia is 17.6 wt% hydrogen and liquefies under modest pressure; solid-state magnesium is heavy. Ammonia's costs are elsewhere: it is toxic and corrosive, and cracking it back to hydrogen needs roughly 400-500 C plus a separation step.
It is, and that is a real advantage. But methanol reforming releases CO2 as a matter of chemistry, not as a leak you can fix. If your mandate is zero-emission hydrogen, methanol does not meet it however well it is engineered.
At the 6.15-6.89 wt% our catalysed systems reach, one tonne of hydrogen needs roughly 15 tonnes of storage material, before the vessel and heat exchanger. We publish that arithmetic because a buyer will do it anyway.
The Pd/MWCNT catalyst that goes into the magnesium. Not the vessel, not the system, and not ammonia or methanol technology.
Tell us your application — a real person replies within 1–2 business days.