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• W2018126329 abstract "Ruthenium (1.5 wt% Ru) supported on γ-Al2O3 was synthesized in the presence of ethylene glycol using ruthenium acetylacetonate as precursor. The catalyst was characterized by inductively coupled plasma (ICP) emission spectroscopy, X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), energy dispersive X-ray (EDX) spectroscopy and X-ray photoelectron spectroscopy (XPS). It was found that it consisted of Ru0 and RuO2 as spherical nanoparticles, with an average size of 4.2 nm, and aggregates deposited at the surface of the support. The catalyst was tested in hydrolysis of ammonia borane, NH3BH3. Experiments with variable amounts of catalyst (10–30 wt%), concentrations of the substrate (1.0–0.65 M), and temperatures (50–66 °C) were performed. The reaction was followed by volumetric (inverted burette) and spectroscopic (11B and 11B{1H} NMR) methods. A kinetic study was developed (apparent activation energy of 67 kJ mol−1; reaction orders vs. the concentration of NH3BH3 and ruthenium active sites of 0.4 and 1.0, respectively). Hydrogen generation rates up to 76.4 mL(H2) min−1 or 158.5 L(H2) min−1 g−1 (for the highest catalyst loading) were measured, which classify our catalyst among the most reactive ones. The NMR study showed a rapid NH3BH3 hydrolysis also at room temperature with initial formation of B(OH)4−, which besides would favor following equilibriums of formation of polyborates. Finally, after deactivation of the catalyst in the first run, the hydrolysis mechanism resulted substantially unmodified. These results are reported and discussed herein." @default.
• W2018126329 created "2016-06-24" @default.
• W2018126329 creator A5035087361 @default.
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• W2018126329 date "2011-07-01" @default.
• W2018126329 modified "2023-10-17" @default.
• W2018126329 title "Facile synthesis by polyol method of a ruthenium catalyst supported on γ-Al2O3 for hydrolytic dehydrogenation of ammonia borane" @default.
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• W2018126329 doi "https://doi.org/10.1016/j.cattod.2011.01.040" @default.
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