caa a22 4500 445303263 CHVBK 20180317142604.0 cr unu---uuuuu 170323e20100901xx s 000 0 eng 10.1007/s12274-010-0031-7 doi (NATIONALLICENCE)springer-10.1007/s12274-010-0031-7 Monodisperse nickel nanoparticles supported on SiO2 as an effective catalyst for the hydrolysis of ammonia-borane [Elektronische Daten] [Önder Metin, Saim Özkar, Shouheng Sun] Monodisperse Ni nanoparticles (NPs) have been synthesized by the reduction of nickel(II) acetylacetonate with the borane-tributylamine complex in a mixture of oleylamine and oleic acid. These Ni NPs are an active catalyst for the hydrolysis of the ammonia-borane (AB, H3N·BH3) complex under ambient conditions and their activities are dependent on the chemical nature of the oxide support that they were deposited on. Among various oxides (SiO2, Al2O3, and CeO2) tested, SiO2 was found to enhance Ni NP catalytic activity due to the etching of the 3.2 nm Ni NPs giving Ni(II) ions and the subsequent reduction of Ni(II) that led to the formation of 1.6 nm Ni NPs on the SiO2 surface. The kinetics of the hydrolysis of AB catalyzed by Ni/SiO2 was shown to be dependent on catalyst and substrate concentration as well as temperature. The Ni/SiO2 catalyst has a turnover frequency (TOF) of 13.2 mol H2·(mol Ni)−1 · min−1—the best ever reported for the hydrolysis of AB using a nickel catalyst, an activation energy of 34 kJ/mol ± 2 kJ/mol and a total turnover number of 15,400 in the hydrolysis of AB. It is a promising candidate to replace noble metals for catalyzing AB hydrolysis and for hydrogen generation under ambient conditions. Tsinghua University Press and Springer-Verlag Berlin Heidelberg, 2010 Nickel nanoparticles nationallicence supported catalyst nationallicence hydrogen storage nationallicence hydrolysis of ammonia-borane nationallicence Metin Önder Department of Chemistry, Middle East Technical University, 06531, Ankara, Turkey aut Özkar Saim Department of Chemistry, Middle East Technical University, 06531, Ankara, Turkey aut Sun Shouheng Department of Chemistry, Brown University, 02912, Providence, Rhode Island, USA aut Nano Research Tsinghua Press 3/9(2010-09-01), 676-684 1998-0124 3:9<676 2010 3 12274 https://doi.org/10.1007/s12274-010-0031-7 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s12274-010-0031-7 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Metin Önder Department of Chemistry, Middle East Technical University, 06531, Ankara, Turkey aut NATIONALLICENCE 700 1- Özkar Saim Department of Chemistry, Middle East Technical University, 06531, Ankara, Turkey aut NATIONALLICENCE 700 1- Sun Shouheng Department of Chemistry, Brown University, 02912, Providence, Rhode Island, USA aut NATIONALLICENCE 773 0- Nano Research Tsinghua Press 3/9(2010-09-01), 676-684 1998-0124 3:9<676 2010 3 12274 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer