A recoverable polyoxometalate-ionic liquid catalyst for selective cleavage of lignin β-O-4 models under mild conditions?

Green Chemistry Pub Date: 2023-03-07 DOI: 10.1039/D3GC00087G

Abstract

The efficient and selective cleavage of the β-O-4 linkage under mild conditions represents a promising strategy to convert lignocellulose to value-added aromatic chemicals. In this work, a recoverable polyoxometalate-ionic liquid (POM-IL) catalyst has been successfully constructed by reacting H5PMo10V2O40 (HPMoV) polyoxoacids with 1-methyl-3-(4-sulfobutyl)-1H-imidazolium (BMIM-SO3) zwitterions. Such a POM-IL catalyst can selectively and effectively convert various β-O-4 lignin models into aromatic acids and phenols under mild homogeneous conditions. Addition of ethyl acetate to the homogeneous post-reaction solution allows the easy recovery of the POM-IL catalyst for successive five recycling tests with high robustness. The dominant catalytic pathway was elucidated by a series of mechanistic studies.

Graphical abstract: A recoverable polyoxometalate-ionic liquid catalyst for selective cleavage of lignin β-O-4 models under mild conditions
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