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This paper investigated the pyrolytic behaviors of enzymatic hydrolysis lignin (EHL) and EHL treated with steam explosion (EHL‐SE) by pyrolysis‐gas chromatography/mass spectrometer (Py‐GC/MS).  It was  shown  that  the main  component  of  the  pyrolysis  products was  phenolic compounds,  including  G‐type,  H‐type,  S‐type,  and  C‐type  phenols. With  different  treatment methods,  the  proportion  of  units  in  phenolic  products  had  changed  significantly. Meanwhile, proximate, elemental, and FTIR analysis of both lignin substrates were also carried out for a further understanding of the lignin structure and composition with or without steam explosion treatment. FTIR result showed that, after steam explosion treatment, the fundamental structural framework of the  lignin  substrate was  almost  unchangeable,  but  the  content  of  lignin  constituent  units,  e.g., hydroxyl  group  and  alkyl  group,  evidently  changed.  It  was  noticeable  that  2‐methoxy‐4‐ vinylphenol with 11% relative content was the most predominant pyrolytic product for lignin after steam explosion treatment. Combined with the above analysis, the structural change and pyrolysis product distribution of EHL with or without steam explosion treatment could be better understood, providing more support for the multi‐functional utilization of lignin.

Pyrolysis Products Distribution of Enzymatic Hydrolysis Lignin with/without Steam Explosion Treatment by Py-GC/MS