TY - JOUR

T1 - Efficient and Product-Controlled Depolymerization of Lignin Oriented by Raney Ni Cooperated with Cs x H3 − x PW12O40.

AU - Shen, Xiao-Jun

AU - Wen, Jia-Long

AU - Huang, Pan-Li

AU - Zheng, Kai

AU - Wang, Shuang-Fei

AU - Liu, Qiuyun

AU - Charlton, Adam

AU - Sun, Run-Cang

PY - 2017/7/22

Y1 - 2017/7/22

N2 - A representative lignin was firstly prepared and characterized as well as an efficient lignin depolymerization process with highly controllable products was presented using Cs-substituted tungstophosphate (CsTP) cooperated with Raney Ni in the present study. The double enzymatic lignin (DEL) was depolymerized efficiently in the temperature range of 250–280 °C. The synergistic effects of Raney Ni with CsTP and temperature on the degradation of lignin were investigated by FT-IR, NMR, GPC, and GC-MS techniques. Under the optimal condition with tandem catalyst at 270 °C for 3 h, the yield of depolymerized DEL was over 70 wt% and phenolic monomers were over 20%. The weight average molecular weight of the lignin was reduced significantly from 15,770 to 1150 g/mol (for aqueous phase lignin) and about 420 g/mol (organic phase lignin). In addition, only a few syringols and cyclohexanols were obtained, indicating that this tandem catalyst facilitates the depolymerization and demethoxylation but prevents hydrogenation of benzene ring of lignin. More importantly, the formation of char was restrained effectively in this process.

AB - A representative lignin was firstly prepared and characterized as well as an efficient lignin depolymerization process with highly controllable products was presented using Cs-substituted tungstophosphate (CsTP) cooperated with Raney Ni in the present study. The double enzymatic lignin (DEL) was depolymerized efficiently in the temperature range of 250–280 °C. The synergistic effects of Raney Ni with CsTP and temperature on the degradation of lignin were investigated by FT-IR, NMR, GPC, and GC-MS techniques. Under the optimal condition with tandem catalyst at 270 °C for 3 h, the yield of depolymerized DEL was over 70 wt% and phenolic monomers were over 20%. The weight average molecular weight of the lignin was reduced significantly from 15,770 to 1150 g/mol (for aqueous phase lignin) and about 420 g/mol (organic phase lignin). In addition, only a few syringols and cyclohexanols were obtained, indicating that this tandem catalyst facilitates the depolymerization and demethoxylation but prevents hydrogenation of benzene ring of lignin. More importantly, the formation of char was restrained effectively in this process.

KW - Ligninisolation

KW - Depolymerization

KW - RaneyNi

KW - Cs-substitutedtungstophosphate

M3 - Article

VL - 10

SP - 1155

EP - 1162

JO - BioEnergy Research

JF - BioEnergy Research

SN - 1939-1234

IS - DOI 10.1007/s12155-017-9855-2

ER -