Journal Article

Ammonia Decomposition over Alkali Metal -Promoted Bulk Mosub.2N Catalyst

Bamufleh, Hisham S, Zaman, Sharif F

2023

Overview

Ammonia (NH[sub.3]), 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 NH[sub.3] using a bulk Mo[sub.2]N catalyst that was boosted by alkali metals (AM: 5 wt% Li, K, Cs). The K-Mo[sub.2]N catalyst outperformed all other catalysts in this experiment in terms of catalytic performance. At 6000 h[sup.−1] GHSV, 100% conversion of NH[sub.3] was accomplished using the K-Mo[sub.2]N, Cs-Mo[sub.2]N, and Mo[sub.2]N catalysts. However, when compared to other catalysts, K-Mo[sub.2]N had the highest activity, or 80% NH[sub.3] 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-Mo[sub.2]N > Cs-Mo[sub.2]N > Li-Mo[sub.2]N > Mo[sub.2]N. Up to 20 h of testing the K-Mo[sub.2]N catalyst at 600 °C revealed no considerable deactivation.

• Publisher: MDPI AG
• Subject: Ammonia