Promotion of the Ni/γ-Al2O3 catalyst for the hydrogenation of naphthalene by silica coating

Wu, Jingpeng; Ren, Shibiao; Zhao, Ruiqing; Wang, Zhicai; Lei, Zhiping; Kang, Shigang; Pan, Chunxiu; Li, Zhan-Ku; Yan, Jingchong; Shui, Hengfu

doi:10.1007/s11144-019-01651-4

Cited by 6 publications

(1 citation statement)

References 24 publications

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“…The reduction of nickel species in the Ni-A sample started at about 550 °C and is represented by a double reduction peak with maximums at 750 and 810 °C (Figure 5B), indicating stable nickel-oxide species. Such a stabilisation effect of nickel-oxide species deposited on alumina has been reported by many authors, including He et al [40] and Wu et al [41], who reported the formation of stable surface NiAl2O4 spinels under calcination conditions. Tillmann et al [42] demonstrated that nickel in NiAl2O4 spinels deposited on alumina was reduced at about 800 °C.…”

Section: Sample Namesupporting

confidence: 67%

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

Kowalczyk,

Rutkowska,

Gnyla

et al. 2024

ChemEngineering

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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.

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Section: Sample Namesupporting

confidence: 67%