Glycerol to lactic acid conversion by NHC-stabilized iridium nanoparticles
Artikel i vetenskaplig tidskrift, 2018
Hydrogen reduction of an Ir(I) complex featured by a bulky N-heterocyclic carbene (NHC) ligand in dichloromethane gave small-sized (1.8 nm) Ir nanoparticles (NPs) decorated with NHC ligands (IrNHC). 1,4-Dioxane solutions of the latter particles were successfully applied to convert glycerol into lactic acid in the presence of NaOH (i.e. 1 mol equivalent with respect to glycerol). IrNHC showed an atom-related TOF value of almost 104 h−1, an almost exclusive formation of liquid reaction products, a high selectivity for lactic acid (93.0%) and a complete recyclability in air atmosphere. Attempts to synthesize analogous NHC-stabilized Ir NPs on a high surface area carbon support (CK) by reducing the same Ir(I) precursor, supported onto CK, prior to the hydrogen reduction in water, gave almost naked CK-supported Ir NPs (1.4 nm). Their catalytic activity tested for the same reaction in water as reaction medium, exhibited much lower catalytic activity (4 × 103 h−1), a lower percentage of liquid reaction products (i.e. 27.0% of the converted glycerol) and a lower selectivity for lactic acid compared to IrNHC.
Iridium nanoparticles
1,4-Dioxane
NHC-ligand
Glycerol
Lactic acid
Författare
Werner Oberhauser
Isituto di Chimica dei Composti Organometallici (ICCOM)
Consiglio Nazionale delle Ricerche (CNR)
Claudio Evangelisti
Consiglo Nazionale Delle Richerche
Istituto di Scienze e Tecnologie Molecolari
A. Liscio
Consiglo Nazionale Delle Richerche
Istituto per la Sintesi Organica e la Fotoreattività (ISOF-CNR)
Alessandro Kovtun
Consiglo Nazionale Delle Richerche
Istituto per la Sintesi Organica e la Fotoreattività (ISOF-CNR)
Yu Cao
Chalmers, Industri- och materialvetenskap, Material och tillverkning
Francesco Vizza
Consiglo Nazionale Delle Richerche
Isituto di Chimica dei Composti Organometallici (ICCOM)
Journal of Catalysis
0021-9517 (ISSN) 1090-2694 (eISSN)
Vol. 368 298-305Ämneskategorier
Oorganisk kemi
Annan kemiteknik
Organisk kemi
DOI
10.1016/j.jcat.2018.10.024