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Ni/MgO Catalysts for Ammonia Decomposition: Impact of Ni Loading, Reducibility, and Promoter Effects
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DOI：10.1002/cnma.70319.png)
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Abstract
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Ammonia is emerging as a carbon-free hydrogen carrier, making efficient catalysts for NH3 decomposition essential for clean energy applications. In this study, Ni/MgO nanocomposite catalysts with 5–50 wt% Ni were synthesized and evaluated for ammonia cracking. Structural characterization (XRF, PXRD, FE-SEM, EDS mapping, TEM, HR-TEM, SAED) revealed that increasing Ni loading promotes the transition from highly dispersed Ni species to larger, well-connected, crystalline Ni nanoclusters with strong Ni/MgO interfacial interactions. H2-TPR confirmed enhanced reducibility at higher Ni loadings. Catalytic activity strongly correlated with Ni domain continuity and reducibility, with 30% and 50% Ni/MgO achieving 90% NH3 conversion at 618°C and 605°C, respectively, at a GHSV of 20,400 mL/gcat/h, achieving much higher activity than the catalysts with lower Ni content. Alkali promoters (Cs, K) offered only marginal improvement (598ºC). The 50% Ni/MgO catalyst also showed excellent stability, maintaining constant NH3 conversion for 72 h at 600°C. These results demonstrate a clear structure–reducibility–activity relationship and identify high-Ni-loaded Ni/MgO catalysts as promising, durable candidates for carbon-free ammonia decomposition.
Keywords:
ammonia decomposition
catalysis
hydrogen
nickel
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