title: Kinetic investigation into the chemoselective hydrogenation of α,β-unsaturated carbonyl compounds catalyzed by Ni(0) nanoparticles.
abstract: A series of Ni(0) nanocatalysts was prepared from a Ni(COD)2complex in the presence of different stabilizers (hexadecylamine, polyvinylpyrrolidone (PVP), PVP/triphenylphosphine, octanoic acid and stearic acid) for their evaluation in the selective hydrogenation reaction of α,β-unsaturated carbonyl compounds by H2under mild reaction conditions, i.e., low H2pressure, temperature and catalyst loading. All nanocatalysts were active in reducing only the C[double bond, length as m-dash]C bond and this chemoselectivity was attributed to the reduced nature of the Ni-NPs surface. Moreover, the hydrogenation reaction rate appeared to be sensitive to ligand type, with the carboxylic acid-stabilized systems showing the best performances. A full kinetic investigation into the t-chalcone chemoselective reduction of the C[double bond, length as m-dash]C bond, with the best catalyst (Ni-octanoic acid) revealed that the rate-determining step is the hydrogenation of the adsorbed substrate on the NPs surface, following a Horiuti-Polanyi type of mechanism. Regarding sustainable chemistry concerns, the best catalyst could be reused up to 10 times without significant loss of activity.
authors.affiliation: Chemistry Department (LaCBio), Universidade Federal de Santa Catarina, Florianópolis, SC, C.P. 476, 88040-900, Brazil. josiel.domingos@ufsc.br.
authors.forename: Laíze
authors.initials: L
authors.lastname: Zaramello
authors.forename: Brunno L
authors.initials: BL
authors.lastname: Albuquerque
authors.forename: Josiel B
authors.initials: JB
authors.lastname: Domingos
authors.forename: Karine
authors.initials: K
authors.lastname: Philippot