This post was missing; a cold stream of hydrogen gas mixed with a warm stream of nitrogen gas to produce ammonia without high pressure and temperature.
It is not a mix of cold nitrogen and hot hydrogen because I remember a jet of hydrogen gas from a high pressure cylinder smells like ammonia and that ammonia is found in dark underground where warm air mix in with the cold and damp.
This post came after the postulate that there is another class of chemistry involving temperature particles, where a temperature difference provides for the disparity in temperature charge, analogous the electric charge that fills oxidation states in normal chemistry.
I am not back; data is very expensive.
