Hydrogen getters are substances capable of absorbing hydrogen under low pressure (less than 1 atm). Titanium is a potentially suitable material because of its favorable thermodynamics, but it is not active without activation treatment. Activation requires annealing in hydrogen atmosphere at temperatures exceeding 400oC, which is unfeasible in many applications. Catalyzed titanium powder does not require any activation and exhibits excellent absorption kinetics even under very low hydrogen pressures.
Synthesis of the catalyzed titanium powder
starting titanium sponge
before ball milling after ball milling
Catalyzed titanium powder absorbs hydrogen without any activation with excellent kinetics even under low pressures
After the completion of the absorption (which takes less than a minute under the pressure of 1 atm at room temperature), a fully hydrogenated titanium hydride is formed: TiH2
X-ray diffraction patterns show the difference between the catalyzed and non-catalyzed powder: the non-catalyzed Ti remains unchanged after hydrogenation, while the catalyzed powder formed titanium hydride
The powder of titanium hydride with uniform size and narrow particle size distribution is an ideal foaming agent for metal foams, such as aluminum foam.
Other metals getters for hydrogen: zirconium, niobium. etc.
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