Magnesium hydride $(\ce{MgH2})$ is a metal hydride with a relatively stable structure, at least compared to other metal hydrides. Magnesium hydride splits at around 300 °C into magnesium and hydrogen. The decomposition temperature can be halved with a catalyst.
Unfortunately, these catalysts are often titanium-based (example A and example B), which does not make this a realistic way to reduce the temperature required, at least not if made for wide-spread production, as titanium is a rare and expensive metal.
What catalysts are proven and effective at reducing the temperature required to break magnesium hydride, that don't include titanium?