INTERNATIONAL JOURNAL OF SCIENTIFIC DEVELOPMENT AND RESEARCH International Peer Reviewed & Refereed Journals, Open Access Journal ISSN Approved Journal No: 2455-2631 | Impact factor: 8.15 | ESTD Year: 2016
open access , Peer-reviewed, and Refereed Journals, Impact factor 8.15
Novel N^O imine-based PGM complexes of RuII, RhIII, IrIII as (pre)catalysts for the hydrogenation of carbon dioxide
Authors Name:
DR. NYASHA MAKUVE
Unique Id:
IJSDR2103097
Published In:
Volume 6 Issue 3, April-2021
Abstract:
Although CO2 is abundant and safe compared to CO as C1 carbon source, it is known to have high kinetic and thermodynamic stability. Transition metal-based complexes mainly those of Ru, Rh, Pd and Ir metals have been extensively studied as CO2 hydrogenation (pre)catalysts due to their high activity towards hydrogen dissociation. Herein, we synthesised novel (E)-4-(((4-carboxyphenyl)imino)methyl)-3-hydroxybenzoic acid (L) and (E)-4-((4-carboxybenzylidene)amino)-3-hydroxybenzoic acid (L1) metal complexes {[(L)RuII] (C1), [(L)IrIII] (C2), [(L]RhIII (C3), (L1)RuII] (C4), [(L1)IrIII] (C5), [(L1]RhIII (C6)} for the hydrogenation of CO2 to value added chemicals. The N^O ligand donor C1-C6 complexes were characterized using several analytical techniques, including: NMR spectroscopy and high-resolution mass spectrometry. All six catalyst precursors were able to hydrogenate CO2 to formate as a product in the presence of a solvent and base with a total pressure of 60 bar at a moderate temperature of 120 oC. However, the best combination of catalyst precursor and a base was C1 and KOH that produced formate with the highest TON value of 700 achieved in 72 h and TON of 425 within 24 h with catalyst loading of 4 µmol. The 13C{1H} NMR suggests that bicarbonate is an intermediate in the production of formate from CO2 hydrogenation in the presence of all the six catalyst precursors. This work is significant because it provides a one-step synthesis for formate from CO2 using N^O Schiff base complexes which can be synthesised in a one-step reaction.
"Novel N^O imine-based PGM complexes of RuII, RhIII, IrIII as (pre)catalysts for the hydrogenation of carbon dioxide", International Journal of Science & Engineering Development Research (www.ijsdr.org), ISSN:2455-2631, Vol.6, Issue 3, page no.566 - 585, April-2021, Available :http://www.ijsdr.org/papers/IJSDR2103097.pdf
Downloads:
000336257
Publication Details:
Published Paper ID: IJSDR2103097
Registration ID:193110
Published In: Volume 6 Issue 3, April-2021
DOI (Digital Object Identifier):
Page No: 566 - 585
Publisher: IJSDR | www.ijsdr.org
ISSN Number: 2455-2631
Facebook Twitter Instagram LinkedIn