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Originally Posted by MRiGnS  I know they are not the same, but I just wanted to exclude it so no one would come by and claim they are. |
Okay, as long as the distinction is clear, that's all that matters.
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Originally Posted by MRiGnS I just meant it might be possible to have something similar to the to us known photosynthesis as chlorine molecules do react on uv-ray influence and the radicals can react with methane in an exothermic reaction. |
A chlorine radical and methane reaction is self-propagating, as it is a free radical substitution reaction. New radicals are formed by reactions involving old ones (there are intermediate methyl group radicals, as well as chlorine radicals, present). Thus, the reaction releases huge amounts of energy relatively quickly. (A mixture of hydrogen gas and chlorine gas will explode in the presence of UV light.)
In humans (and most other animals), respiration reaction speeds are moderated by the mitochondria present in our cells. I would be surprised if a reaction like the one above could contain that sort of energy and harness it for energy production.