Selective catalytic transformation of lignin with guaiacol as the only liquid product

Shen, Xiaojun; Meng, Qinglei; Mei, Qingqing; Liu, Huizhen; Jiang, Yan; Song, Jinliang; Tan, Dongxing; Chen, Bingfeng; Zhang, Zhanrong; Yang, Guanying; Han, Buxing

doi:10.1039/c9sc05892c

Cited by 78 publications

(44 citation statements)

References 48 publications

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“…These works achieved an impressive yield of bio‐based phenols from raw biomass via (i) RCF combined with demethoxylation/dealkylation; and (ii) oxidative depolymerization followed by decarboxylation. La(OTf) 3 could catalyze the depolymerization of lignin to obtain alkyl‐guaiacol and alkyl‐syringol, which underwent further dealkylation and demethoxylation to obtain an appreciable yield (25.5 wt %) of guaiacol (Figure d) . Ferulic acid could be derived from ferulate structure in herbaceous biomass, and Brønsted acid catalyzed defunctionalization of ferulic acid to bio‐catechol was reported, which unlocked the potential to produce catechol from raw biomass .…”

Section: Other Strategies For Improving the Monomer Yields And Potentmentioning

confidence: 99%

Recent Advances in the Catalytic Depolymerization of Lignin towards Phenolic Chemicals: A Review

et al. 2020

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The efficient valorization of lignin could dictate the success of the 2nd generation biorefinery. Lignin, accounting for on average a third of the lignocellulosic biomass, is the most promising candidate for sustainable production of value‐added phenolics. However, the structural alteration induced during lignin isolation is often depleting its potential for value‐added chemicals. Recently, catalytic reductive depolymerization of lignin has appeared to be a promising and effective method for its valorization to obtain phenolic monomers. The present study systematically summarizes the far‐reaching and state‐of‐the‐art lignin valorization strategies during different stages, including conventional catalytic depolymerization of technical lignin, emerging reductive catalytic fractionation of protolignin, stabilization strategies to inhibit the undesired condensation reactions, and further catalytic upgrading of lignin‐derived monomers. Finally, the potential challenges for the future researches on the efficient valorization of lignin and possible solutions are proposed.

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Section: Other Strategies For Improving the Monomer Yields And Potentmentioning

confidence: 99%

Recent Advances in the Catalytic Depolymerization of Lignin towards Phenolic Chemicals: A Review

et al. 2020

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“…The low yield of guaiacol hindered its further industrial application owing to the complicated and costly purification process. More recently, our group reported a novel route to produce pure guaiacol selectively from lignin using La(OTf) 3 as a Lewis acid catalyst in methanol/water solvent and the yield of guaiacol reached up to 25.5 wt %. This is the first work on the transformation of lignin with guaiacol as the only liquid product.…”

Section: Directed Cleavage Of Ether Linkages In the Side Chain Of Ligninmentioning

confidence: 99%

Product‐oriented Direct Cleavage of Chemical Linkages in Lignin

Shen

Liu

2020

ChemSusChem

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Lignin is one of the most important biomacromolecules in the plant biomass and the largest renewable source of aromatic building blocks in nature. Selectively producing value‐added chemicals from the catalytic transformation of renewable lignin is of strategic significance and meet sustainability targets owing to the excessive consumption of non‐renewable petroleum resource, but remains a long‐term challenge owing to the complexity of lignin structure. This Minireview provides a summary and perspective of the extensive research that provides insight into selectively catalytic transformations of lignin and its derived monomers via directed scissor of chemical linkages (C−O and C−C bonds) with product‐oriented targets. Furthermore, some challenges and opportunities of lignin catalytic transformation are provided based on existing problems in this field for readers to discuss future research directions.

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“…Rather than gasifying lignin, a next best alternative technology within the context of more conventional heterotrophic fermentation would be a process that converts lignin to guaiacol, thereafter converting the guaiacol to BDO via the 3-oxoadipate pathway. Shen et al (2020) demonstrated that lignin can be selectively converted to guaiacol as an alternate technology to gasification. C. necator is capable of degrading .…”

Section: Systems Biology For Bdo Synthesis Using Co 2 and H 2 And Guaiacol As Sole Energy And Carbon Sourcesmentioning

confidence: 99%

A Sustainable Chemicals Manufacturing Paradigm Using CO2 and Renewable H2

et al. 2020

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The chemical industry must decarbonize to align with UN Sustainable Development Goals. A shift toward circular economies makes CO 2 an attractive feedstock for producing chemicals, provided renewable H 2 is available through technologies such as supercritical water (scH 2 O) gasification. Furthermore, high carbon and energy efficiency is paramount to favorable techno-economics, which poses a challenge to chemo-catalysis. This study demonstrates continuous gas fermentation of CO 2 and H 2 by the cell factory, Cupriavidus necator, to (R,R)-2,3-butanediol and isopropanol as case studies. Although a high carbon efficiency of 0.75 [(C-mol product)/(C-mol CO 2 )] is exemplified, the poor energy efficiency of biological CO 2 fixation requires 8 [(mol H 2 )/(mol CO 2 )], which is technoeconomically infeasible for producing commodity chemicals. Heat integration between exothermic gas fermentation and endothermic scH 2 O gasification overcomes this energy inefficiency. This study unlocks the promise of sustainable manufacturing using renewable feedstocks by combining the carbon efficiency of bio-catalysis with energy efficiency enforced through process engineering.

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Selective catalytic transformation of lignin with guaiacol as the only liquid product

Abstract: La(OTf)3 can catalyze the transformation of lignin efficiently with guaiacol as the only liquid product, and guaiacol produced can be isolated easily in a scaled up experiment.

Cited by 78 publications

References 48 publications

Recent Advances in the Catalytic Depolymerization of Lignin towards Phenolic Chemicals: A Review

Recent Advances in the Catalytic Depolymerization of Lignin towards Phenolic Chemicals: A Review

Product‐oriented Direct Cleavage of Chemical Linkages in Lignin

A Sustainable Chemicals Manufacturing Paradigm Using CO2 and Renewable H2

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