Ni-Mg-Al Catalysts Effectively Promote Depolymerization of Rice Husk Lignin to Bio-Oil

作者：Du, Boyu; Chen, Changzhou; Sun, Yang; Liu, Bingyang; Yang, Yingying; Gao, Si; Zhang, Zhenshu; Wang, Xing^*; Zhou, Jinghui^*

来源：Catalysis Letters, 2020, 150(6): 1591-1604.

DOI：10.1007/s10562-019-02956-8

• Lignin depolymerization
• Hydrotalcite-like catalyst
• Light oil
• Crude oil
• Phenolic monomer

Catalytic depolymerization of lignin to produce bio-oil, liquid fuels, and aromatic chemicals in high yields is important for a biorefinery to remain competitive. In this study, undoped and Ni-doped catalysts for depolymerization of rice husk lignin (RHL) were developed and analyzed. The results showed that the catalysts had hydrotalcite-like structures with lamellar morphology. With suitable Ni-doping amount, the catalysts had high activity, thus better promoted the depolymerization of RHL. Among all catalysts, the Ni1/4MgAl catalyst could best promote the cleavage of the beta-O-4 aryl ether bond in RHL molecule and thus could substantially increase the yields of bio-oil. The depolymerization catalyzed by this catalyst was also found to be temperature-, time-, and solvent-dependent. This study provides information that can be beneficial to the biorefinery industries and may help promote the valorization of lignin.

• 单位
  大连工业大学; 广西大学