How can a mixture of ammonia and hydrogen be seperated?

A jug of ammonia (Not hard to keep liquid at room temperature with modest pressure.) has more hydrogen in it than a jug of pure liquid hydrogen! * (which is very hard to keep liquid even with huge pressures and very cold temperatures)

The ammonia molecules have weaker inter molecular bonds then the hydrogen and nitrogen, this means that the ammonia condensed at a lower temperature so will be a liquid that will be separated from the reaction, while the nitrogen and hydrogen remain as gases so are easy are recycle back into the reacting chamber.