Ni5Fe5/Al2O3 catalytic hydrogenolysis of lignin: mechanism investigation and selectivity regulation

The development of novel catalysts to regulate product selectivity and insight into the mechanism of lignin hydrogenolysis are important for the comprehensive utilization of lignocellulose. Herein, we present a non-precious bimetallic catalyst Ni5Fe5/Al2O3 with improved catalytic performance relativ...

Full description

Saved in:
Bibliographic Details
Published in:Green chemistry : an international journal and green chemistry resource : GC 2023-10, Vol.25 (19), p.7782-7793
Main Authors: Shen, Zhensheng, Wang, Wei, Pan, Lun, Huang, Zhenfeng, Zhang, Xiangwen, Shi, Chengxiang, Ji-Jun Zou
Format: Article
Language:English
Subjects:
Alcohols
Aluminum oxide
Bimetals
Catalysts
Green chemistry
Hydrogenolysis
Intermediates
Lignin
Lignocellulose
Sawdust
Sinapyl alcohol
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:The development of novel catalysts to regulate product selectivity and insight into the mechanism of lignin hydrogenolysis are important for the comprehensive utilization of lignocellulose. Herein, we present a non-precious bimetallic catalyst Ni5Fe5/Al2O3 with improved catalytic performance relative to commercial Pd/C and Ni10/Al2O3 for hydrogenolysis of woody sawdust. In particular, the selectivity of propylguaiacol and propylsyringol is 79.1%. We developed kinetic experimental studies on β-O-4 model compounds and directly monitored the coniferyl alcohol or sinapyl alcohol intermediates in the reaction system for the first time. This directly demonstrates the lignin hydrolysis reaction pathway with simultaneous breakage of Cα–OH and Cβ–O. In the catalytic system, the reason for the difference in selectivity between Ni5Fe5/Al2O3 and other catalysts is their different hydrogenation pathways for intermediates coniferyl alcohol or sinapyl alcohol. Our work provides both an efficient catalyst and insight into understanding and regulating the mechanism of lignin hydrogenolysis.
ISSN:1463-9262
1463-9270
DOI:10.1039/d3gc01988h