Hydrolysis-dominated catalytic system: Hydrogen-free hydrogenolysis of lignin from Pd-MoO < sub > x < /sub > /TiO < sub > 2 < /sub >

In this study, the Pd-MoOx/TiO2 catalyst was found to primarily catalyze hydrolysis in the lignin depolymerization process, attributed to the abundance of moderate acidic sites on Pd and the redox-assisted catalysis of MoOx under inert conditions. After subjecting the reaction to 240 °C for 30 h, a yield of 48.22 wt% of total phenolic monomers, with 5.90 wt% consisting of diphenols, was achieved. Investigation into the conversion of 4-propylguaiacol (4-PG), a major depolymerized monomer of corncob lignin, revealed the production of ketone intermediates, a phenomenon closely linked to the unique properties of MoOx. Dehydrogenation of the propyl is a key step in initiating the reaction, and 4-PG could be almost completely transformed, accompanied by an over 97 % of 4-propylcatechol selectivity. This distinctive system lays a new theoretical groundwork for the eco-friendly valorization of lignin.PMID:38621572 | DOI:10.1016/j.ijbiomac.2024.131538

Source: International Journal of Biological Macromolecules - April 15, 2024 Category: Biochemistry Authors: Daobin Tang Xuebin Lin Qi Zhang Zhenni Wang Yuhang Liu Yanqiao Jin Xinru Wu Cejun Hu Pei Yuan Source Type: research