Study on the removal and depolymerization of lignin from corn stover through the synergistic effect of Bronsted acid, Lewis acid and hydrogenation sites

The effective transformation of lignin is an essential part of realizing the comprehensive utilization of biomass. In this study, a one-pot method for the depolymerization of corn stover lignin used aluminum phosphate (NiAPO-5) zeolite catalyst contained Bronsted acid, Lewis acid and hydrogenation sites was proposed. It was found that the number of Bronsted acid sites was increased after NiAPO-5 was reduced with H-2Y. The yield of monomers and residue were 35.70% and 38.09% at 235 degrees C for 3 h, respectively. The result of 2D HSQC NMR showed that the NiAPO-5 (H-2) catalyst significantly affected the cleavage of beta-O-4 bonds. The distribution of products and the stability of catalyst revealed that NiAPO-5 (H-2) was an efficient catalyst for the depolymerization of lignin.

Automated summary

A one-pot method using NiAPO-5 zeolite catalyst was proposed for the depolymerization of lignin, which showed increased Brønsted acid sites after treatment and yielded well in monomers and residue. The catalyst efficiently affected the cleavage of beta-O-4 bonds, making it a promising option for lignin depolymerization.