What element would the hemoglobin content of methane-based life use?

So to start, let's assume that this hypothetical life form relied on something similar to LNG (liquefied natural gas) - mainly relying on ethane - as a solvent in the same way humans rely on water. Let's also assume that they breathe hydrogen, use acetylene as glucose, expel methane, and that they are carbon based like us.

Knowing that they do not use oxygen, what element makes for the optimal choice in acting as a hydrogen carrier at cryogenic temperatures, in the same way hemoglobin uses iron to act as an oxygen carrier?

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What element would the hemoglobin content of methane-based life use?

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