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Article

Synergistic Effect of Co and Ni Co-Existence on Catalytic Decomposition of Ammonia to Hydrogen—Effect of Catalytic Support and Mg-Al Oxide Matrix

Faculty of Chemistry, Jagiellonian University, Gronostajowa 2, 30-387 Kraków, Poland
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Authors to whom correspondence should be addressed.
ChemEngineering 2024, 8(3), 55; https://doi.org/10.3390/chemengineering8030055
Submission received: 15 February 2024 / Revised: 11 May 2024 / Accepted: 21 May 2024 / Published: 24 May 2024

Abstract

Hydrotalcite-derived mixed metal oxides containing Co and Ni and containing these metals supported on MgO and Al2O3 were prepared and tested as catalysts for the decomposition of ammonia to hydrogen and nitrogen. The obtained samples were characterised in terms of chemical composition (ICP-OES), structure (XRD), textural parameters (low-temperature N2 adsorption–desorption, SEM), form and aggregation of transition-metal species (UV-Vis DRS), reducibility (H2-TPR) and surface acidity (NH3-TPD). The catalytic efficiency of the tested systems strongly depends on the support used. Generally, the alumina-based catalyst operated at lower temperatures compared to transition metals deposited on MgO. For both series of catalysts, a synergistic effect of the co-existence of cobalt and nickel on the catalytic efficiency was observed. The best catalytic results were obtained for hydrotalcite-derived catalysts; however, in the case of these catalysts, an increase in the Al/Mg ratio resulted in a further increase in catalytic activity in the decomposition of ammonia.
Keywords: hydrogen; ammonia decomposition; hydrotalcite hydrogen; ammonia decomposition; hydrotalcite

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MDPI and ACS Style

Kowalczyk, A.; Rutkowska, M.; Gnyla, S.; Pacia, M.; Chmielarz, L. Synergistic Effect of Co and Ni Co-Existence on Catalytic Decomposition of Ammonia to Hydrogen—Effect of Catalytic Support and Mg-Al Oxide Matrix. ChemEngineering 2024, 8, 55. https://doi.org/10.3390/chemengineering8030055

AMA Style

Kowalczyk A, Rutkowska M, Gnyla S, Pacia M, Chmielarz L. Synergistic Effect of Co and Ni Co-Existence on Catalytic Decomposition of Ammonia to Hydrogen—Effect of Catalytic Support and Mg-Al Oxide Matrix. ChemEngineering. 2024; 8(3):55. https://doi.org/10.3390/chemengineering8030055

Chicago/Turabian Style

Kowalczyk, Andrzej, Małgorzata Rutkowska, Sylwia Gnyla, Michał Pacia, and Lucjan Chmielarz. 2024. "Synergistic Effect of Co and Ni Co-Existence on Catalytic Decomposition of Ammonia to Hydrogen—Effect of Catalytic Support and Mg-Al Oxide Matrix" ChemEngineering 8, no. 3: 55. https://doi.org/10.3390/chemengineering8030055

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