Abstract
Lignin is recognized as a good sustainable material because of its great abundance and potential applications. At present, lignin hydrogenolysis is considered as a potential but challenging way to produce low-molecular-mass aromatic chemicals. The most common linkage between the structural units of lignin polymer is the β-O-4 aryl ether, which are primary or even only target chemical bonds for many degradation processes. Herein, a Pd-Fe3O4 composite was synthesized for catalytic hydrogenolysis of β-O-4 bond in lignin. The synthesized catalyst was characterized by XRD, XPS, and SEM and the lignin depolymerization products were analyzed by GC-MS. The catalyst showed good catalytic performance during the hydrogenolysis process, lignin dimer was degraded into monomers completely and a high yield of monomers was obtained by the hydrogenolysis of bagasse lignin. More importantly, the magnetic catalyst was separated conveniently by magnet after reaction and remained highly catalytically efficient after being reused for five times. This work has demonstrated an efficient & recyclable catalyst for the cleavage of the β-O-4 bond in lignin providing an alternative way to make better use of lignins.
Highlights
As the second largest component of Lignocellulose materials, lignin is a renewable and sustainable natural polymer with great potential applications [1,2,3]
The Pd-Fe3 O4 magnetic catalyst was prepared by two facile experimental steps, including co-precipitation and wet-impregnation [24]
14 min, min, referring referring to to monomer monomer 11 and. These results indicated the complete cleavage of β-O-4 bond in dimer and 2, respectively. These results indicated the complete cleavage of β-O-4 bond in dimer after after the the catalytic hydrogenolysis of β-O-4 lignin model dimer by magnetic catalytic hydrogenolysis of β-O-4 lignin model dimer by magnetic Pd-Fe33O44 catalyst
Summary
As the second largest component of Lignocellulose materials, lignin is a renewable and sustainable natural polymer with great potential applications [1,2,3]. From the perspective of the chemical structure of lignin and its potential applications, it was suggested that lignin can be a great source of valuable aromatic chemicals if the natural lignin could be broken into small molecular units [7]. The most difficult aspect of using this technique was that the depolymerization process for such conversions of lignocellulose materials has been very elusive [8]. Amongst linkages between structural units, the β-O-4 ether bond occupies the majority of the linkages, which makes up a 50% proportion in the softwood lignin and up to
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