Fig. 3: Isotope-labelled ammonia synthesis on Ba3SiO5−xNyHz.
From: Anion vacancies activate N2 to ammonia on Ba–Si orthosilicate oxynitride-hydride
a,b, Reaction time profiles for NH3 synthesis from 15N2 and H2 over Ba3SiO5−xNyHz (a) and the change in mass signal ratio over reaction time (b). c, TPD for Ba3SiO5−xNyHz collected after the isotope-labelled ammonia synthesis. d,e, Reaction time profiles for NH3 synthesis from 15N2 and H2 over Ru/Ba3SiO5−xNyHz (d) and the change in mass signal ratio over reaction time (e). The dotted lines in b and e represent the theoretical fragment ratio (NH2/NH3 = 0.8 and NH/NH3 = 0.075). f, TPD for Ru/Ba3SiO5−xNyHz collected after the isotope-labelled ammonia synthesis. The content of 15N in the desorbed nitrogen gas was calculated from the shaded area in panels c and f.
