PubAg

Main content area

Attapulgite‐supported magnetic dual acid–base catalyst for the catalytic conversion of lignin to phenolic monomers

Author:
Wu, Zhen, Zhang, Jun, Zhao, Xinxu, Li, Xun, Zhang, Yu, Wang, Fei
Source:
Journal of chemical technology and biotechnology 2019 v.94 no.4 pp. 1269-1281
ISSN:
0268-2575
Subject:
biorefining, catalysts, catalytic activity, clay, ethanol, hydrogen, lignin, magnetic properties, magnetism, value added
Abstract:
BACKGROUND: Research on the catalytic conversion of lignin into value‐added chemicals has grown rapidly on account of the importance of lignin in the biorefinery. There is thus a need to investigate novel technologies to depolymerize lignin in the absence of hydrogen gas and noble metal catalysts. This study developed a cheap and recyclable catalyst via a facile process involving impregnation and calcination for the conversion of lignin to value‐added phenolic monomers. RESULTS: Acid sites, basic sites and magnetic components were successfully incorporated into attapulgite. The resulting catalyst displayed high catalytic activity for lignin conversion to phenolic monomers, which resulted in 10.9% total monomers yield at 250 °C for 3 h with a catalyst loading of 50% and a solvent–solid ratio of 20:1 in 50% C₂H₅OH. The total monomers yield decreased observably after eight successive reaction runs. After being calcined at 600 °C for 3 h, the recovered catalyst provided a total monomers yield of 6.74% in the ninth reaction run. CONCLUSION: A novel catalyst was successfully prepared by incorporation of acid sites, basic sites and magnetic properties using natural attapulgite clay as a precursor via a simple and inexpensive process. The resulting catalyst could depolymerize lignin efficaciously. The reusability of the catalyst was barely satisfactory, however, the activity could be partly recovered by simple calcination. © 2018 Society of Chemical Industry
Agid:
6327057