https://scholars.lib.ntu.edu.tw/handle/123456789/581579
Title: | Effect of Solvent, Role of Formic Acid and Rh/C Catalyst for the Efficient Liquefaction of Lignin | Authors: | Matsagar B.M Wang Z.-Y Sakdaronnarong C Chen S.S Tsang D.C.W Wu K.C.W. KEVIN CHIA-WEN WU |
Keywords: | Catalysts; Formic acid; Hydrogen; Hydrogen bonds; Hydrogenation; Liquefaction; Organic solvents; Alkali lignin; Bio oil; Effect of solvents; Hydrogen sources; Hydrolysis reaction; Mild reaction conditions; Monomeric products; Phenolic monomers; Lignin; Catalysts; Formic Acid; Hydrogen Bonds; Hydrogenation; Liquefaction | Issue Date: | 2019 | Journal Volume: | 11 | Journal Issue: | 18 | Start page/Pages: | 4604-4616 | Source: | ChemCatChem | Abstract: | 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). ? 2019 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim |
URI: | https://www.scopus.com/inward/record.uri?eid=2-s2.0-85070839525&doi=10.1002%2fcctc.201901010&partnerID=40&md5=e729aa4e964e4422c680a02fe2d24b03 https://scholars.lib.ntu.edu.tw/handle/123456789/581579 |
ISSN: | 18673880 | DOI: | 10.1002/cctc.201901010 |
Appears in Collections: | 化學工程學系 |
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