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



Lactic acid


Werner Oberhauser

Consiglio Nazionale delle Ricerche (CNR)

Isituto di Chimica dei Composti Organometallici (ICCOM)

Claudio Evangelisti

Consiglo Nazionale Delle Richerche

Istituto di Scienze e Tecnologie Molecolari

A. Liscio

Istituto Per La Sintesi Organica E La Fotoreattivita, Bologna

Consiglo Nazionale Delle Richerche

Alessandro Kovtun

Consiglo Nazionale Delle Richerche

Istituto Per La Sintesi Organica E La Fotoreattivita, Bologna

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. 368 298-305


Oorganisk kemi

Annan kemiteknik

Organisk kemi



Mer information

Senast uppdaterat