Vanadium-Substituted Phosphomolybdic Acids for the Aerobic Cleavage of Lignin Models-Mechanistic Aspect and Extension to Lignin

Louay Al-Hussaini; Franck Launay; Elena Galvez

doi:10.3390/ma13040812

Vanadium-Substituted Phosphomolybdic Acids for the Aerobic Cleavage of Lignin Models-Mechanistic Aspect and Extension to Lignin

Materials (Basel). 2020 Feb 11;13(4):812. doi: 10.3390/ma13040812.

Authors

Louay Al-Hussaini^{1

2}, Franck Launay¹, Elena Galvez²

Affiliations

¹ Centre National de la Recherche Scientifique, UMR 7197, Laboratoire de Réactivité de Surface (LRS), Sorbonne Université, F-75005 Paris, France.
² Centre National de la Recherche Scientifique, UMR 7190, Institut Jean le Rond d'Alembert, Sorbonne Université, F-75005 Paris, France.

Abstract

This work deals with the aerobic oxidative cleavage of C-C and C-O bonds catalyzed by the Keggin-type phosphovanadomolybdic acid (H₆[PMo₉V₃O₄₀], noted H₆PV₃). The latter was synthesized by an adapted hydrothermal procedure classically used for lower vanadium content and was tested as a catalyst for the aerobic cleavage of 2-phenoxyacetophenone (noted K1_HH) and 1-phenyl-2-phenoxyethanol (A1_HH) used as two lignin models. The operative conditions (solvent, catalytic loading, etc.) were adjusted on K1_HH and extrapolated to A1_HH. The cleavage of the alcohol model required more drastic conditions and therefore further optimization. Preliminary attempts on an Organosolv wheat straw lignin were performed too. From the kinetic study, high performance liquid chromatography (HPLC) and gas chromatography-mass spectrometry (GC-MS) data, a mechanism of the cleavage of both models was proposed.

Keywords: aerobic cleavage; keggin-type phosphovanadomolybdic acids; lignin; mechanistic study; parameter optimization.