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Catalytic oxidation of lignin to aromatics over salen-porphyrin complex as a biomimetic catalyst

Lu Xu-Jie, Zhou Xue-Fei, Zhu Zheng-Liang, Sun Yali, Tang Kai, Lei Fu-Hou, Liu Zu-Guang, Wang Ting

Drewno : prace naukowe, doniesienia, komunikaty

2019

vol. 62, nr 203

67--80

The aim of this work is to enable increased production of aromatics by the use of salen-porphyrin complex (ZnPSC6) as a binuclear catalyst for the catalytic oxidation of Indulin AT lignin. Catalytic activity was enhanced by the increase in active sites, as confirmed by the results observed in the conversion of lignin model compounds and Indulin AT lignin compared with processes using the mononuclear complexes Zn(salen) and Zn(Phe-TPP). The yields of long and convoluted aromatics from the catalytic oxidation of Indulin AT lignin with ZnPSC6 reached high values after reaction at 80°C for 24 h. Notably, the formation of vanillin was promoted by the increase in active sites over ZnPSC6. This was followed by a significant decrease of β-O-4 linkages and refractory condensed substructures in the lignin, induced by ZnPSC6. This may be expected to be an important area for further study.