Early transition metal carbides and nitrides catalyze a variety of chemical transformations from gas- and solution phase hydrogenations, to the water-gas-shift reaction. The reaction chemistry of molybdenum nitride has typically focused on the surface interactions between the molybdenum and nitrogen moieties and substrate. Our recent work, however, has raised the possibility that protons are critical to the observed reactivity as well. Results with TiO2 nanoparticles indicate that processes that have been traditionally thought of as electron transfer are often correlated with quantitative proton uptake, and our results suggest that a similar phenomenon may be occurring upon reduction of Mo2N. We request 2 days on TOSCA for inelastic neutron scattering to characterize the nature of the hydrogen environments and quantitate the associated proton stoichiometry in reduced Mo2NHx.