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Hydrolytic dehydrogenation of NH(3)BH(3) catalyzed by ruthenium nanoparticles supported on magnesium–aluminum layered double-hydroxides
Ammonia borane (AB, NH(3)BH(3)) with extremely high hydrogen content (19.6 wt%) is considered to be one of the most promising chemical hydrides for storing hydrogen. According to the starting materials of AB and H(2)O, a hydrogen capacity of 7.8 wt% is achieved for the AB hydrolytic dehydrogenation...
Autores principales: | , , , , , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
The Royal Society of Chemistry
2020
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9052328/ https://www.ncbi.nlm.nih.gov/pubmed/35498595 http://dx.doi.org/10.1039/d0ra01720e |
Sumario: | Ammonia borane (AB, NH(3)BH(3)) with extremely high hydrogen content (19.6 wt%) is considered to be one of the most promising chemical hydrides for storing hydrogen. According to the starting materials of AB and H(2)O, a hydrogen capacity of 7.8 wt% is achieved for the AB hydrolytic dehydrogenation system with the presence of a highly efficient catalyst. In this work, ruthenium nanoparticles supported on magnesium–aluminum layered double hydroxides (Ru/MgAl-LDHs) were successfully synthesized via a simple method, i.e., chemical reduction. The effect of Mg/Al molar ratios in MgAl-LDHs on the catalytic performance for AB hydrolytic dehydrogenation was systematically investigated. Catalyzed by the as-synthesized Ru/Mg(1)Al(1)-LDHs catalyst, it took about 130 s at room temperature to complete the hydrolysis reaction of AB, which achieved a rate of hydrogen production of about 740 ml s(−1) g(−1). Furthermore, a relatively high activity (TOF = 137.1 mol(H(2)) mol(Ru)(−1) min(−1)), low activation energy (E(a) = 30.8 kJ mol(−1)) and fairly good recyclability of the Ru/Mg(1)Al(1)-LDHs catalyst in ten cycles were achieved toward AB hydrolysis for hydrogen generation. More importantly, the mechanism of AB hydrolysis catalyzed by Ru/MgAl-LDHs was simulated via density functional theory. The facile preparation and high catalytic performance of Ru/MgAl-LDHs make it an efficient catalyst for hydrolytic dehydrogenation of AB. |
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