Kong, Xiangchen published the artcileCatalytic hydroprocessing of stubborn lignin in supercritical methanol with Cu/CuMgAlOx catalyst, Application In Synthesis of 645-56-7, the publication is Fuel Processing Technology (2021), 106869, database is CAplus.
Stubborn lignin (SL) is the thermochem. stable fragment generated from biomass utilization (e.g., pyrolysis, hydrolysis, fermentation, pulping), which is comparatively difficult to be further depolymerized into value-added bio-products. The cleavage of the stubborn linkages within the structure of SL, such as C-C, α-O-4, and 4-O-5 linkages, is the key for its valorization. Herein, we investigated the depolymerization of SL through catalytic hydroprocessing in supercritical methanol with Cu/CuMgAlOx catalyst. The yield of monomers reached 37.76C% with 240 min at 300 °C. Cyclohexanols were identified as the major monomeric products, indicating the occurrence of hydrodeoxygenation and hydrogenation. GPC, quant. 13C NMR, HSQC NMR, and HMBC NMR analyses evidenced the depolymerization of SL and upgrading of its derivatives Furthermore, the mechanistic studies were carried out to provide insights to the stubborn linkage cleavages. The degrees of difficulty to break up the three involved linkages obeyed the sequence of β-5 > 4-O-5 > α-O-4. The apparent activating energies (Ea), chemisorption energies (Ec), and bond dissociation energies (BDE) were determined computationally to support the exptl. results from the perspectives of kinetics, chemisorption, and thermodn., resp. This research provides a reliable way for the utilization of SL.
Fuel Processing Technology published new progress about 645-56-7. 645-56-7 belongs to alcohols-buliding-blocks, auxiliary class Liquid Crystal &OLED Materials, name is 4-Propylphenol, and the molecular formula is C9H12O, Application In Synthesis of 645-56-7.
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