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Green dehydrogenation of dimethylamine-borane by PVP-stabilized Ru ( 0 ) nanoparticles
| Content Provider | Semantic Scholar |
|---|---|
| Author | Bukan, Berivan Duman, Sibel |
| Abstract | Preparation of nanoparticles (NPs) on large scales, which can be used in practical applications, is very difficult to obtain via both “top-down” (physical methods) and “bottomup” (chemical methods) approaches. Therefore, in recent years, atom-economy and solventfree approaches have attracted the attention for a permanent solution to this problem. Moreover, solvent-free approaches have drawn considerable attention and popularity, both from an environmental point of view and for synthetic advantages in terms of yield, selectivity, and simplicity of the reaction procedure [1,2]. Additionally, very recently work shown that dehydrogenation of dimethylamine borane (DMAB) can be catalyzed starting with sole Ru(acac)3 in toluene solution at temperature above 50°C [3]. Herein, DMAB that has low melting point (~35oC) was used as both reducing and stabilizing agent for synthesis of Polyvinylpyrrolidone (PVP)-stabilized Ru NPs. We report that PVP-stabilized Ru NPs are normally obtained by decomposition of Ru(acac)3 during the solvent-free (green) dehydrogenation of DMAB under inert gas atmosphere at nearly room temperature (35+0.1°C). The one equivalent of H2 generation from DMAB was completed in 150 min after short time initiation process (4 min). The green dehydrogenation of DMAB in the presence PVP-stabilized Ru NPs corresponding to an initial turnover frequency of 41 h -1 after 2 h. PVP-stabilized Ru NPs were characterized by transmission electron microscopy (TEM), high resolution TEM (HRTEM), TEM-EDX, UV-Visible electronic absorption spectroscopy and X-ray diffraction (XRD). The quantitative heterogeneity of the in situ generated PVP-stabilized Ru NPs in the green dehydrogenation of DMAB was identified by 1,10-phenanthroline poisoning experiments. Also, the detailed kinetics in the green dehydrogenation of DMAB was studied by varying catalyst and substrate loadings and temperature. These results indicate that green dehydrogenation by PVP-stabilized Ru NPs minimizes waste disposal problems and provides a simple yet efficient example of unconventional technical. |
| File Format | PDF HTM / HTML |
| Alternate Webpage(s) | http://www.bingol.edu.tr/documents/selection%20(1)(2).pdf |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
