AB2 alloy holds only about 2 wt% — is magnesium really 3x better?

On capacity, yes: peer-reviewed measurement gives 6.89 wt% reversible capacity at 375 °C for AZ31 with 5 wt% Pd/MWCNT catalyst, against roughly 2 wt% for AB2. But capacity is not the only axis. AB2 operates near 120 °C while magnesium needs roughly 325-375 °C, with about 285 °C as the practical floor. If you do not have heat above 285 °C, the capacity advantage is unreachable.

Can a catalyst make magnesium work at AB2 temperatures?

Not to 120 °C. A catalyst lowers the kinetic barrier, not the thermodynamic equilibrium temperature. With a good formulation the desorption onset can be brought down towards 285 °C, but onset temperature is not the same as complete release at a useful flow rate. Anyone promising AB2 temperatures with magnesium capacity should be asked for the measurement conditions.

Do I have to change my production line?

No. The additive goes in at 1-5 wt% into your existing magnesium alloy powder process. What does change is the system side: the bed needs insulation rated for 300-400 degC and a heat-transfer path, which is real engineering work.

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Decision guide

You are on AB2 and it will not give up its hydrogen. Should you switch to magnesium?

AB2 metal hydride runs at a comfortable temperature and holds very little. Magnesium holds three to four times more and demands a lot of heat. That is the whole trade, and which side of it you belong on is decided almost entirely by one thing — what heat you already have on site. This page walks it through, including the cases where the answer is that you should stay where you are.

The trade, in one table

	AB2 metal hydride	Magnesium-based
Hydrogen capacity	≈2 wt%	6.89 wt% reversible (AZ31 + 5 wt% catalyst)
Operating temperature	≈120 °C	325–375 °C for efficient desorption
Storage pressure	Ambient	Ambient
Heat required	Low-grade heat, often waste hot water	Industrial waste heat above ~300 °C, or a burner
Material mass per kg H₂	≈50–70 kg	≈14.5 kg
Raw material cost	Rare-earth / titanium based, priced accordingly	Magnesium — China is the world's largest producer
Suitable for vehicles	Yes	No — the heat requirement rules it out
Suitable for stationary with waste heat	Works, but you carry the capacity penalty	This is what it is for

The decision comes down to your heat source

AB2 alloys release hydrogen at around 120 °C. Magnesium needs roughly 325–375 °C for efficient desorption, and about 285 °C is the practical floor even with a good catalyst. That single difference decides almost everything.

Magnesium is worth considering if…you have a fixed installation and a real heat source above 300 °C that is currently being thrown away — cement kiln preheater exhaust, glass or ceramic kiln flue, steel reheating furnace, refinery FCC regenerator, gas-turbine exhaust, or high-temperature fuel-cell exhaust. In those cases the heat costs you nothing and the capacity gain is free.

Stay on AB2 if…the system moves, or your best available heat is below about 285 °C, or a low operating temperature is a hard requirement rather than a preference. Magnesium will not serve you in those cases, and no catalyst formulation changes that.

If you want to check your own flue-gas temperature against the window properly, we built a tool for it: waste-heat match and system sizing.

If you do switch, what actually changes

The tank gets much smaller for the same hydrogen. At 6.89 wt% you need about 14.5 kg of material per kg of H₂, against roughly 50–70 kg for AB2.
You gain a heat management problem you did not have. The bed needs insulation rated for 300–400 °C, a heat-transfer path, and a control strategy. This is real engineering, not a drop-in swap of powder.
Raw material exposure changes. AB2 alloys are rare-earth or titanium based. Magnesium is the most abundantly produced of the structural metals, and China is the largest producer.
Your refuelling time changes with temperature. At 375 °C, absorption reaches 90% in 446 s and desorption in 735 s with our catalyst. At 325 °C capacity is far lower. Read the full measured data, including one temperature where our catalyst is slower than the untreated alloy.

What we sell, and what we do not

We sell the catalyst additive, not the storage system and not the magnesium. That distinction matters:

If you already make or buy magnesium-based storage material, our additive goes in at 1–5 wt% and you keep your existing process. Nothing about your production line changes.
If you need a complete storage system with tanks, valves and controls, we are not that supplier — companies such as Hydrexia build those, and you should talk to them.
If you need bulk MgH₂ by the tonne, we are not that supplier either.

Where we are genuinely useful: you have a target — a temperature, a capacity, a cycle count, a cost ceiling — and you want a catalyst formulation built to hit it rather than picked off a shelf. Component ratios are adjustable across the full range, and formulations can combine precious metals, rare-earth oxides, transition metals and conductive carbon. Tell us the four numbers and we will tell you honestly whether it is achievable.

→ Which catalyst route fits your substrate

The trade, in one table

The decision comes down to your heat source

Work out your own answer

If you do switch, what actually changes

What we sell, and what we do not