Abstract: Lignin is the second abundant natural organic polymer, only second to cellulose, which is a complex three-dimensional amorphous polymer, consisting of three different monomer units (sinapyl, coniferyl , and p-coumaryl alcohols) linked with various C-C and C-O-C linkages. It is the richest source of renewable aromatic compounds on planet, and harbors great potential for the production of industrially relevant aromatic bulk and fine chemicals. However, its inherent complexity of chemical linkages makes it difficult to achieve selectivity in chemical transformations. In recent years, the research on catalytic degradation liquefaction of lignin has attracted more and more attention. In this paper, the advances in the field of catalytic degradation liquefaction of lignin are reviewed, and the mesoporous solid acid catalysts loaded with metal particles are put forward to be an efficient way for the degradation liquefaction of lignin. Based on the analysis of the size and morphology of lignin molecules in the solution, the matching mesoporous catalysts loaded with acid and metal particles are designed, which can realize the catalytic degradation of lignin in finite channels and restrain the repolymerization of the degradation fragments considerably.
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