Nitrogen production

=== Catalyst ===
http://citizensciencequarterly.com/2011/05/liquid-nitrogen-generator/
http://homemadeliquidnitrogen.com/joulethomson.html
http://hackaday.com/2014/05/23/homemade-liquid-nitrogen/
https://cen.acs.org/synthesis/One-step-synthesis-urea-green/98/i24?utm_source=YMAL&utm_medium=YMAL&utm_campaign=CEN&utm_content=pos2
https://phys.org/news/2019-04-ammonia-production.html catalyst is extracted with electricity.
=== Energy ===
Nitrogen uses 10kwh for one kg of nitrogen in the Faber Bosch process. 
=== links ===
Air Engine
Category:Agriculture
Category:Chemical production
Category:Nitrogen