This step is known as the ammonia synthesis loop ( also referred to as the Haber -- Bosch process ) : Hydrogen required for ammonia synthesis could also be produced economically using other sources like coal or coke gasification or less economically from the electrolysis of water into oxygen + hydrogen and other alternatives that are presently impractical for large scale .
This step is known as the ammonia synthesis loop ( also referred to as the Haber-Bosch process ) : Hydrogen required for ammonia synthesis could also be produced economically using other sources like coal or coke gasification , less economically from the electrolysis of water into oxygen + hydrogen and other alternatives that are presently impractical for large scale production .