Journal
BIORESOURCE TECHNOLOGY
Volume 319, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2020.124238
Keywords
Lignin; Hydrogenolysis; Catalysis; Mixed solvent; MALDI-TOF MS
Funding
- National Natural Science Foundation of China [51676047, 5181101221]
- Scientific Research Foundation of Graduate School of Southeast University [YBJJ1807]
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In this study, catalytic hydrogenolysis of organosolv poplar lignin was conducted using NiCu/C catalysts in ethanol/isopropanol solvent, achieving high yields of phenolic monomers. The introduction of Cu in catalysts promoted the hydrogen donor process of the solvent and facilitated the cleavage of lignin linkages, resulting in decreased molecular weight of bio-oil. The possible lignin dimer type structures were proposed and identified by MALDI-TOF MS, providing a better understanding of NiCu/C catalyzed lignin depolymerization.
Lignin is the renewable and abundant source of aromatics on earth, and the depolymerization of lignin provides significant potential for producing valuable monophenols. In this work, catalytic hydrogenolysis of organosolv poplar lignin (OPL) in ethanol/isopropanol solvent over monometallic and bimetallic nonprecious catalysts was investigated. Ni/C and a series of NiCu/C catalyst with different Cu loadings were prepared and applied for depolymerization of OPL. The highest yield of phenolic monomers was 63.4 wt% achieved over the Ni10Cu5/C catalyst at 270 degrees C without external H-2. The introduction of Cu in catalysts further promoted the hydrogen donor process of ethanol/isopropanol solvent and facilitated the cleavage of lignin linkages, resulting in the decreased molecular weight of bio-oil. The possible lignin dimer type structures, such as diphenylethane (beta-1) type, phenylcoumaran (beta-5) type, and pinoresinol (beta-beta) type structures, were proposed and identified by MALDI-TOF MS, giving a better understanding of the NiCu/C catalyzed lignin depolymerization.
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