[Sudetenland]

Yep, and where do we get that methane?.....from refining oil.

This is (as Spock would say) "fascinating," but it is still pie-in-the-sky technology. Hydrogen is one of the most dangerous combustible gases because it heats up with expansion rather than cooling with expansion, Thus any leak in the system becomes an instant ignition hazard.

It embrittles steel (as was already stated), it attacks most elastomers so the choice of seals in joints is critical, and (also as stated previously) it takes a heck of a lot more energy to produce than it generates...Oh yeah and the molecule is really-really small, so leaking is difficult to control.

Not saying it's impossible, just a long way from being practical.

[reg45]

Oops! Virtually all methane is found in the form of natural gas. It is only coincidentally produced from oil refining. The “gas” in a gas stove is primarily methane.

[ichabod1]

It’s the smallest POSSIBLE molecule, isn’t it?

[mamelukesabre]

heats up with expansion rather than cooling with expansion
~~~~~~~~~~~~~~~~~~~

I think that’s impossible. If it were true then compressing H2 gas into a liquid would absorb heat rather than give off heat. And that just is not possible.