Ammonia Decomposition over Alkali Metal (Li, K, Cs)-Promoted Bulk Mo 2 N Catalyst.

Ammonia (NH₃), which has a 17.7 wt% gravimetric hydrogen density, has been considered as a potential hydrogen storage material. This study looked at the thermocatalytic decomposition of NH₃ using a bulk Mo₂N catalyst that was boosted by alkali metals (AM: 5 wt% Li, K, Cs). The K-Mo₂N catalyst outperformed all other catalysts in this experiment in terms of catalytic performance. At 6000 h⁻¹ GHSV, 100% conversion of NH₃ was accomplished using the K-Mo₂N, Cs-Mo₂N, and Mo₂N catalysts. However, when compared to other catalysts, K-Mo₂N had the highest activity, or 80% NH₃ conversion, at a lower temperature, or 550 °C. The catalytic activity exhibited the following trend for the rate of hydrogen production per unit surface area: K-Mo₂N > Cs-Mo₂N > Li-Mo₂N > Mo₂N. Up to 20 h of testing the K-Mo₂N catalyst at 600 °C revealed no considerable deactivation. [ABSTRACT FROM AUTHOR]