Catalytic pyrolysis mechanism of lignin moieties driven by aldehyde, hydroxyl, methoxy, and allyl functionalization: the role of reactive quinone methide and ketene intermediates
Zeyou Pan, Xiangkun Wu, András Bödi, Jeroen A. van Bokhoven, Patrick Hemberger
Abstract
C1/C2/C3 loss, but also cyclize to indene and its derivatives over HZSM-5. This comparably high reactivity leads to an unselective branching of the chemistry and to a complex product distribution, which is difficult to control. Indenes and naphthalenes are also prototypical coke precursors efficiently deactivating the catalyst. We rely on these mechanistic insights to discuss strategies to fine-tune process conditions to increase the selectivities of desired products by enhancing either vanillin and guaiacol or supressing eugenol yields from native lignin.
Topics & Concepts
KeteneChemistryQuinone methideCatalysisSurface modificationAldehydeReactive intermediateLigninOrganic chemistryPyrolysisMechanism (biology)Reaction mechanismQuinonePhotochemistryPhysical chemistryEpistemologyPhilosophyLignin and Wood ChemistryFermentation and Sensory AnalysisEnzyme-mediated dye degradation