Effective depolymerization of alkali lignin using an attapulgite-Ce0.75Zr0.25O2(ATP-CZO)-supported cobalt catalyst in ethanol/isopropanol media

doi:10.1016/j.cjche.2022.08.018

Abstract

Abstract: Lignin is the world's greatest renewable aromatic biofeedstock, and it has promising applications in high value-added chemical products. Herein, N-Co/ATP-CZO was used as a catalyst for the depolymerization of alkali lignin in ethanol and isopropanol systems, and explored the effects of formic acid (FA) amount, reaction time, reaction temperature and other factors on the depolymerization of alkali lignin. Among them, formic acid serves as both catalytic and in situ-hydrogen donor. Ultimately, the highest yield of bio-oil (59.28% (mass)), including 30.05% (mass) of monomer, was obtained after a reaction of FA to alkali lignin mass ratio of 4 and 240 ℃ for 8 h. Among the monomers, the yield of Guaiacol was the highest (5.94% (mass)), followed by 2-methoxy-4-methylphenol (5.74% (mass)). This study, the modification of attapulgite was carried out to reduce the acidity while enhancing the catalytic activity for depolymerization, and the selection of hydrogen donor was investigated. A feasible pathway for lignin depolymerization research was opened.

Key words: Lignin, Biofuel, Catalyst support, Mixing, Ce_0.75Zr_0.25O₂ solid solution

摘要： Lignin is the world's greatest renewable aromatic biofeedstock, and it has promising applications in high value-added chemical products. Herein, N-Co/ATP-CZO was used as a catalyst for the depolymerization of alkali lignin in ethanol and isopropanol systems, and explored the effects of formic acid (FA) amount, reaction time, reaction temperature and other factors on the depolymerization of alkali lignin. Among them, formic acid serves as both catalytic and in situ-hydrogen donor. Ultimately, the highest yield of bio-oil (59.28% (mass)), including 30.05% (mass) of monomer, was obtained after a reaction of FA to alkali lignin mass ratio of 4 and 240 ℃ for 8 h. Among the monomers, the yield of Guaiacol was the highest (5.94% (mass)), followed by 2-methoxy-4-methylphenol (5.74% (mass)). This study, the modification of attapulgite was carried out to reduce the acidity while enhancing the catalytic activity for depolymerization, and the selection of hydrogen donor was investigated. A feasible pathway for lignin depolymerization research was opened.

关键词: Lignin, Biofuel, Catalyst support, Mixing, Ce_0.75Zr_0.25O₂ solid solution

Jiajia Chen, Xinyu Lu, Dandan Wang, Pengcheng Xiu, Xiaoli Gu. Effective depolymerization of alkali lignin using an attapulgite-Ce_0.75Zr_0.25O₂(ATP-CZO)-supported cobalt catalyst in ethanol/isopropanol media[J]. Chinese Journal of Chemical Engineering, 2023, 57(5): 50-62.

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Effective depolymerization of alkali lignin using an attapulgite-Ce_0.75Zr_0.25O₂(ATP-CZO)-supported cobalt catalyst in ethanol/isopropanol media

Effective depolymerization of alkali lignin using an attapulgite-Ce_0.75Zr_0.25O₂(ATP-CZO)-supported cobalt catalyst in ethanol/isopropanol media

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