Abstract
In this paper, we present platinum/ruthenium nanoparticles supported onVulcan carbon (PtRu@VC) as a nanocatalyst for the dehydrogenation ofdimethylamine-borane (DMAB) in aqueous solution under mild conditions. PtRu@VCnanocatalyst was fabricated using the alcohol-reduction techniques which is a facileand effective method. The prepared PtRu@VC nanocatalyst exhibited a goodstabilization and an effective catalytic activity for hydrogen evolution from theDMAB dehydrogenation in water at room temperature. The composition of PtRu@VCnanocatalyst was investigated using different analytical techniques inductivelycoupled plasma optical emission spectroscopy (ICP-OES), transmission electronmicroscopy (TEM), high-resolution transmission electron microscopy (HR-TEM), powderX-ray diffraction (P-XRD) and X-ray photoelectron spectroscopy (XPS). AmonodispersedPt/Ru metals distributions on VC (as supporting material) were revealedby TEM and HR-TEM analyses. The mean particle size of PtRu@VC nanocatalyst was foundto be 3.15 ± 0.76 nm. XPS analysis for PtRu@VC nanocatalyst showed that almost Pt-Rumetals were found to be the metallic state. Catalytic experimental results showedthat PtRu@VC nanocatalyst has a high catalytic activity with an excellent turn-overfrequency (TOFinitial)value of 14926.2 h−1(248.77 min−1) in the dehydrogenation of DMAB inwater at room temperature. Additionally, in the paper, we report some differentkinetic data obtained from different experimental parameters of temperature,catalyst and substrate concentrations conducted for DMAB dehydrogenation in watercatalyzed with PtRu@VC nanocatalyst.
Highlights
In this paper, we present platinum/ruthenium nanoparticles supported on Vulcan carbon (PtRu@VC) as a nanocatalyst for the dehydrogenation of dimethylamine-borane (DMAB) in aqueous solution under mild conditions
Mercury poisoning test results showed that PtRu@VC nanocatalyst is a water-dispersible and heterogeneous catalyst for DMAB dehydrogenation in water[60,61]
The mean particle size of the obtained PtRu@VC nanocatalyst was calculated as 3.15 ± 0.76 nmby transmission electron microscopy (TEM) analyzes
Summary
We present platinum/ruthenium nanoparticles supported on Vulcan carbon (PtRu@VC) as a nanocatalyst for the dehydrogenation of dimethylamine-borane (DMAB) in aqueous solution under mild conditions. As results of the conducted experimental findings and calculation of kinetic studies, Vulcan carbon-supported Pt-Ru nanoparticles can catalyze in the dehydrogenation of DMAB with a record activity (initial turn-over frequency, TOFinitial = 14926.2 h−1 (248.77 min−1)) at high conversion (>99%) under mild conditions (at 298 K andunder air). This new superior nanocatalyst enables facile catalyst recovery and very high stability against agglomeration, and leaching, which make it highly recycle catalyst (retains ~64% activity and >99% conversion at the end of 10th catalytic recycle) in the dehydrogenation of DMAB in water under the room conditions
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