Abstract:
Ammonia is weakly adsorbed on hydrated MgO by hydrogen-bonding of the nitrogen to hydroxyl groups exposed on the surface and a strong band at 3045 cm-1 is attributed to surface hydroxyl groups perturbed by the adsorbed ammonia. A rapid isotopic exchange is evident when ND3 is adsorbed; a band ascribed to the symmetric bending frequency is observed at 1137 cm-1 for adsorbed NH3, and two bands at 945 and 860 cm-1 observed when ND3 is adsorbed arc assigned to NHD2 and NDj respectively. All traces of ammonia can be removed by evacuation at room temperature.
