What are we intending to filter?
@Catelite,I don't think that's what they were saying but it isn't a bad idea though.

@Everyone else, this may not be a bad idea but the reactants need to well.., react with more than themselves to be fully useable in return energy type machinery. (that's the only thing I could actually think this would be genuinely useful for anyways.)

Rrrp... you basically have carbon with coal