Fast COinf2/inf hydrogenation to formic acid catalyzed by an Ir(PSiP) pincer hydride in a DMSO/water/ionic liquid solvent system

0532036 - ÚFCH JH 2021 RIV NL eng J - Journal Article
Webber, R. - Qadir, Muhammad Irfan - Sola, E. - Martín, M. - Suárez, E. - Dupont, J.
Fast COinf2/inf hydrogenation to formic acid catalyzed by an Ir(PSiP) pincer hydride in a DMSO/water/ionic liquid solvent system.
Catalysis Communication. Roč. 146, NOV 2020 (2020), č. článku 106125. ISSN 1566-7367. E-ISSN 1873-3905
EU Projects: European Commission(XE) 810310
Institutional support: RVO:61388955
Keywords : CO hydrogenation 2 * Formic acid * Ionic liquids * Iridium * Solvent-cage
OECD category: Physical chemistry
Impact factor: 3.626, year: 2020
Method of publishing: Open access

Complex [IrClH{κP,P,Si-Si(Me)(C6H4–2-PiPr2)2}] (1) showed a remarkable catalytic activity for CO2 hydrogenation in a DMSO/H2O solvent system incorporating 1,2-dimethyl-3-butylimidazolium acetate ionic liquid (IL), producing 0.94 M formic acid with initial TOFs up to 1432 h−1 (CO2/H2 = 20/40 bar, 30 °C). While the hydrogenation outcome followed dependences upon gas composition, pressure and temperature similar to those of other efficient systems in DMSO/H2O, the kinetic dependence upon catalyst loading revealed non-linear effects suggestive of relevant IL-catalyst interactions. NMR speciation studies identified two major complexes, [Ir(OCHO)(H){κP,P,Si-Si(Me)(C6H4–2-PiPr2)2}] (2) and [Ir(H)2{κP,P,Si-Si(Me)(C6H4–2-PiPr2)2}(DMSO)] (3), potentially responsible for catalytic cycling though inactive outside the current solvent system.
Permanent Link: http://hdl.handle.net/11104/0310639