Herein, we report preparation, characterization, and employment of hydroxyapatite-supported rhodium-based Rh-M (RhCo, RhCu, RhFe) nanoclusters as cost-effective, highly efficient and reusable catalysts for hydrogen evolution from ammonia borane methanolysis. Rh-M@HA...
Abstract:For the first time the synthesis of poly( N -vinyl-2-pyrrolidone)-stabilized cobalt-palladium nanoparticles by an easy method, their characterization, and their use as active catalysts for hydrogen release from hydrolysis of ammonia borane and hydrazine borane is reported here. The catalyst is prepared by simultaneous reduction of suitable cobalt and palladium ions by sodium borohydride in the presence of poly( N -vinyl-2-pyrrolidone) as a stabilizer. They are characterized by UV-Vis spectroscopy, TEM analysis, X-ray diffraction, and X-ray photoelectron spectroscopy. They provide average turnover frequencies of 30 min −1 and 45 min −1 in the hydrolysis of ammonia borane and hydrazine borane. They also provide activation energies of 48.6 ± 2 and 50.6 ± 2 kJ mol −1 in the hydrolysis of ammonia borane and hydrazine borane.
Herein, we report the first ever eco-friendly and easy synthesis of carboxymethyl cellulose-stabilized RuCo nanoclusters (Ru 0.57 Co 0.43 @CMC) and their use as highly efficient and durable catalysts to produce hydrogen from hydrolytic dehydrogenation of methylamine borane (MeAB). Ru 0.57 Co 0.43 @CMC nanoclusters are easily synthesized from synchronous chemical reduction of suitable water-soluble cobalt and ruthenium salts by sodium borohydride. They are identified by some advanced methods including ultraviolet− visible spectroscopy, transmission electron microscopy, and X-ray photoelectron spectroscopy. All related kinetic studies show that Ru 0.57 Co 0.43 @CMC nanoclusters are extremely efficient, relatively cost-saver, and durable catalysts in hydrolytic dehydrogenation of MeAB at very low temperatures. They provided the highest ever initial turnover frequency value of 327.1 min −1 and also the apparent activation energy of 49.7 kJ/mol for the hydrolytic dehydrogenation of MeAB.
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