Abstract
Lignin, an abundant biomass waste, was degraded under microwave irradiation with H2O2 as the oxidant and metalloporphyrin as the catalyst. The effect of substituent group (4-methylphenyl, 4-methoxyphenyl, 4-bromophenyl and 4-carboxyphenyl) at the meso-benzene ring of metalloporphyrin, central metal ion (Co, Mn, Ni and Fe) and axial ligand (chlorine, p-hydroxypyridine, p-pyridinecarboxaldehyde) on the degradation of lignin was investigated. The electron-withdrawing group not only reduces the electron cloud density on the porphyrin ring, but also promotes the formation of higher active intermediate [(Porp)MeIV=O]+·. Therefore, the presence of stronger electron-withdrawing substituents makes the metalloporphyrins more efficient in lignin degradation. Compared to Co porphyrin, there are less amount of [(Porp)MeIV=O]+· formed when Mn, Fe or Ni porphyrin was used as the catalyst for degrading lignin. Consequently, Co porphyrin contributed to a higher YAM (the yield of aromatic monomers). The strong nucleophilicity and the low steric hinderance of axial ligand was advantageous for the stability of metalloporphyrins, which is favorable for improving the catalytic activity to the degradation of lignin. It is found that the YAM increases 20.1% from 5.6% by using CoTBrPPCl as the reaction catalyst under the optimized conditions
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This work is supported by the National Natural Science Foundation of China (21576104, 21776108, 21690083) and Science and Technology Program of Guangdong, China (2017B090903003).
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Xie, J., Ma, G., Ouyang, X. et al. Metalloporphyrin as a Biomimetic Catalyst for the Catalytic Oxidative Degradation of Lignin to Produce Aromatic Monomers. Waste Biomass Valor 11, 4481–4489 (2020). https://doi.org/10.1007/s12649-019-00753-3
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DOI: https://doi.org/10.1007/s12649-019-00753-3