Various gasses are currently used to transport and store energy for heating and electricity generation.
Most of them contain carbon:
Methane, propane, butane, carbon monoxide and natural gas.
It could be of advantage to use gasses that do not contain carbon.
One example for that is hydrogen.
Are there other gases that theoretically could be used, if they could easily be created?
I assume most can not practically used because they are not trivial to generate, but I like to ignore that, and assume they can be created.
Are there other gases that could be used, in principle, as energy carrier?