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[quote user="erikem"] [quote user="JT22CW"][quote]If you make steam hot enough, it will disassociate into the component hydrogen and oxygen elements[/quote]You're going to need to go as high as 4,940°F (higher than copper's boiling point) if you want to break those hydrogen bonds..[/quote]A couple of things going on in this discussion - one is whether you can get useful amounts of hydrogen from superheated steam (answer being 'no' for the reason you pointed out) - the other is that bonds do break at temperatures lower than 4,940F, and that limits how much superheat can be used due to corrosion. In a steam locomotive, lubricants will start breaking down at temperatures much lower than the corrosion limits. [/quote]erikem and JT22CW,  Thanks for that information.  It sounds like using exhaust heat to recover hydrogen and/or oxgen would not be feasible because of the temperature needed, as well as the problem of the corrosivness.  But what about just making superheated steam and injecting back into the combustion chambers to recover the energy of its heat and its pressure?  What does hot, dry, superheated steam do to a separate combustion process that has just begun or is about to begin?
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