Kinetic evidence: the rate-determining step for ammonia synthesis over electride-supported Ru catalysts is no longer the nitrogen dissociation step

The rate-determining step for ammonia synthesis over Ru catalysts supported by electrides, such as [Ca 24 Al 28 O 64 ] 4+ (e − ) 4 and Ca 2 N:e − , is suggested to be the surface reactions of N and H adatoms, in which case the Langmuir–Hinshelwood model should be used to describe the kinetics.