On July 31, 2021, Kong, Xiangchen; Liu, Chao; Xu, Weicong; Han, Yue; Fan, Yuyang; Lei, Ming; Li, Ming; Xiao, Rui published an article.COA of Formula: C8H10O The title of the article was Catalytic hydroprocessing of stubborn lignin in supercritical methanol with Cu/CuMgAlOx catalyst. And the article contained the following:
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. The experimental process involved the reaction of 2-Methylanisole(cas: 578-58-5).COA of Formula: C8H10O
The Article related to copper magnesium aluminum oxide catalyst hydroprocessing lignin supercritical methanol, Placeholder for records without volume info and other aspects.COA of Formula: C8H10O
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