Tandem Dehydrogenation of Ammonia Borane and Hydrogenation of Nitro/Nitrile Compounds Catalyzed by Graphene-Supported NiPd Alloy Nanoparticles

Abstract

We report a facile synthesis of monodisperse NiPd alloy nanoparticles (NPs) and their assembly on graphene (G) to catalyze the tandem dehydrogenation of ammonia borane (AB) and hydrogenation of R-NO 2 and/or R-CN to R-NH 2 in aqueous methanol solutions at room temperature. The 3.4 nm NiPd alloy NPs were prepared by coreduction of nickel(II) acetate and palladium(II) acetlyacetonate by borane-tert-butylamine in oleylamine and deposition on G via a solution phase self-assembly process. G-NiPd showed composition-dependent catalysis on the tandem reaction with G-Ni 30 Pd 70 being the most active. A variety of R-NO 2 and/or R-CN derivatives were reduced selectively into R-NH 2 via G-Ni 30 Pd 70 catalyzed tandem reaction in 5−30 min reaction time with the conversion yields reaching up to 100%. Our study demonstrates a new approach to GNiPd-catalyzed dehydrogenation of AB and hydrogenation of R-NO 2 and R-CN. The G-NiPd NP catalyst is efficient and reusable, and the reaction can be performed in an environment-friendly process with short reaction times and high yields.

Composition-controlled catalysis of reduced graphene oxide supported CuPd alloy nanoparticles in the hydrolytic dehydrogenation of ammonia borane

“…The higher dispersion of RGO in aqueous solution makes the CuPd alloy NPs and AB interaction more facile. In our recent studies, we also reported that RGO was also good support material for NiPd and CoPd alloy NPs in the organic reactions owing to theinteraction between the aromatic substrates and the RGO [40,41]. Secondly, the RGO-Cu 75 Pd 25 catalysts were annealed at 400 • C for 1 h under Ar-H 2 flow (5% H 2 ) and its activity was compared to pristine RGO-Cu 75 Pd 25 (Fig.…”

NANO-SIZED La0.5Ca0.5CoO3-MEDIATED REDUCTION BY NaBH4 OF ARYL NITRILES TO BIS-(BENZYL) AMINES

“…The latter intermediate was eventually reduced to the corresponding sec-amine due to the treatment with reducing agent. According to the similar literature, 44 it seems all reactions were conducted on the surface of the nano catalyst (Fig. 8).…”

Pd‐Pt/modified GO as an efficient and selective heterogeneous catalyst for the reduction of nitroaromatic compounds to amino aromatic compounds by the hydrogen source

“…The catalytic hydrogenation of nitro aromatics, which can be performed in the gas or liquid phase due to its environmentally friendly nature, is one of the best methods for the manufacture of aromatic amines . In this respect, different metal supported catalysts have been designed for the hydrogenation of nitro aromatic compounds . Various metals including Pd, Pt, Ni, Ru, and Cu are applied for this reduction; different parameters such as the type of metal, the size of the metal particles, the support, the solvent, and hydrogen pressure are very important factors in this catalytic reaction.…”