Publication: Effect of Solvent, Role of Formic Acid and Rh/C Catalyst for the Efficient Liquefaction of Lignin
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Issued Date
2019-09-19
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18673899
18673880
18673880
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2-s2.0-85070839525
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Mahidol University
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SCOPUS
Bibliographic Citation
ChemCatChem. Vol.11, No.18 (2019), 4604-4616
Suggested Citation
Babasaheb M. Matsagar, Zheng Yen Wang, Chularat Sakdaronnarong, Season S. Chen, Daniel C.W. Tsang, Kevin C.W. Wu Effect of Solvent, Role of Formic Acid and Rh/C Catalyst for the Efficient Liquefaction of Lignin. ChemCatChem. Vol.11, No.18 (2019), 4604-4616. doi:10.1002/cctc.201901010 Retrieved from: https://repository.li.mahidol.ac.th/handle/123456789/50503
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Title
Effect of Solvent, Role of Formic Acid and Rh/C Catalyst for the Efficient Liquefaction of Lignin
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Abstract
© 2019 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim We demonstrate highly efficient liquefaction of alkali lignin with a very high yield of THF-soluble bio-oil (91.5 wt %) using formic acid (FA) and Rh/C catalyst under relatively mild reaction conditions (250 °C, 6 h) in EtOH−H2O co-solvent system. The monomeric products are identified in which alkyl guaiacols accounts for the main proportion. The role of FA was not only used as a liquid-phase in-situ hydrogen source but also acts as organic acid which can catalyze the hydrolysis reaction of −C−O−C ether bonds of lignin. Moreover, in the present study, the role of Rh/C and FA is demonstrated for the liquefaction of lignin. The replacement of pure H2 gas by the liquid-phase FA (hydrogen source) can effectively prevent the char formation. The utilization of Rh/C catalyst helps for the conversion of alkenyl guaiacols to alkyl guaiacols suggesting the hydrogenation of phenolic monomers and further cleavage by hydrogenation results in the formation of bio-oil with lower molecular weight (Mn=466 g mol−1) as well as lower O/C ratio (0.26).