Enzymatic hydrolysis lignin dissolution and low-temperature solvolysis in ethylene glycol

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A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
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Chemical Engineering Journal, Volume 463
The dissolution and solvolysis processes of enzymatic hydrolysis lignin (EHL) in ethylene glycol are investigated. Ethylene glycol exhibits high EHL solubility and achieves complete EHL dissolution at room temperature. Gaussian simulation reveals that van de Waals interactions between ethylene glycol and EHL, including C-H⋯O and lone pair⋯π interactions, break the π-π stacking in EHL, achieving complete EHL dissolution. EHL is partly depolymerized in ethylene glycol at 200 °C even without a catalyst due to the strong van de Waals interactions. When NaOH and Ni are used as co-catalysts, EHL is efficiently depolymerized at 200 °C, and the overall monomer yield reaches 18.8 wt%. Fourier transform infrared spectroscopy (FT-IR) and molecular dynamics simulation results indicate that the adsorption of ethylene glycol over Ni surface hinders the adsorption of lignin fragments and monomers. Hence, EHL catalytic solvolysis in ethylene glycol occurs in the liquid phase, where OH− of NaOH promotes the EHL linkage breakage and active hydrogen atoms formed on Ni surface stabilize the active monomers.
| openaire: EC/H2020/101006744/EU//EHLCATHOL Funding Information: This work has received funding from the European Union’s Horizon 2020 research and innovation program , (BUILDING A LOW-CARBON, CLIMATE RESILIENT FUTURE: SECURE, CLEAN AND EFFICIENT EN-ERGY) under Grant Agreement No 101006744. The content presented in this document represents the views of the authors, and the European Commission has no liability in respect of the content. Y.S. Sang and G. Li would like to express their gratitude to both the China Scholarship Council ( 202006250156 , 202208320030 ) and the EU-101006744 project. Publisher Copyright: © 2023 The Author(s)
Catalysis, Dissolution, Ethylene glycol, Lignin, Solvolysis
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Sang , Y , Ma , Y , Li , G , Cui , K , Yang , M , Chen , H & Li , Y 2023 , ' Enzymatic hydrolysis lignin dissolution and low-temperature solvolysis in ethylene glycol ' , Chemical Engineering Journal , vol. 463 , 142256 . https://doi.org/10.1016/j.cej.2023.142256