Mild selective oxidative cleavage of lignin C–C bonds over a copper catalyst in water

Abstract

The conversion of lignin into aromatics as commodity chemicals and high-quality fuels is a highly desirable goal for biorefineries. However, the presence of robust inter-unit carbon-carbon (C–C) bonds in natural...

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

“…S4†). More importantly, compared to various literature reports (Table S2†), 11–13,18,20,34,35,39,48–55 our present catalytic system using the HPMoV-BMIM-SO 3 H IL catalyst exhibited obvious advantages of mild catalytic conditions, high efficiency, and easy catalyst recovery towards the selective cleavage of lignin β-O-4 models (PP-ol and PP-one).…”

Computer simulation in lignocellulosic biomass conversion processes: A review

“…The selective cleavage of β-O-4, β-1, and C-C bonds catalyzed by copper and alkali solutions to produce high yields of aromatic acids and phenol was first reported by Hu and co-workers. The DFT calculations showed that the oxidation of β-O-4 ketone to peroxide intermediates by Cu and O2 reduced the dissociation energy of the Cα-Cβ bond (Hu et al 2021b). The mechanism of HDO reaction was investigated during the decomposition of anisole over a bifunctional catalyst consisting of metal and Brønsted acid using DFT.…”

Hybridization of CuO with BiVO4 as an Efficient and Stable Photocatalyst for Selective Cleavage of Lignin C–C Bonds

“…13 However, extremely challenging reaction parameters, involving high temperatures and hydrogen gas, were necessary to produce the dissociation of C−C bonds. Even Wang et al described the outstanding yields of aromatic acids and phenols in water at 30 °C after the selective breaking of C−C bonds in β-1 and β-O-4 linkages catalyzed by inexpensive copper and a base, 14 while homogenous catalyst recycling and product separation might be challenging. Thus, developing a sustainable methodology for lignin C−C bond breakage under mild circumstances, such as the most common β-O-4 models, is desirable.…”