Ambient Hydrogenolysis of α-O-4 Lignin Model Compounds over Perovskite-Supported Pd Catalysts

Le résumé fourni par la source

Abstract Hydrogenolysis of lignin model compounds has attracted extensive research attention for lignin valorization. However, achieving such reactions under ambient conditions remains a major challenge. Herein, a series of ABO3-type perovskite-supported Pd catalysts (Pd/ABO3) were fabricated for the hydrogenolysis of α-O-4 lignin model compounds. Interestingly, both ABO3-type perovskite supports and reaction solvents significantly affected the catalytic performance of the constructed Pd/ABO3 catalysts, and Pd/MgTiO3, Pd/BaTiO3, and particularly Pd/CaTiO3 exhibited excellent catalytic activity toward the hydrogenolysis of benzyl phenyl ether in methanol under ambient conditions (room temperature and 1 atm H2), selectively producing toluene and phenol. Notably, Pd/CaTiO3 displayed good applicability for the hydrogenolysis of various α-O-4 lignin models under ambient conditions. Systematic discussion revealed that the high catalytic activity of Pd/CaTiO3 was attributed to the synergistic effect between negatively charged Pd0 sites, facilitating H2 activation to generate active hydrogen species, and oxygen defects/vacancies on the perovskite support, activating the C–O ether bond in α-O-4 lignin models. This work provides an efficient perovskite-supported Pd catalytic system for ambient hydrogenolysis of lignin model compounds via rational modulation of Pd0 electronic states and fabrication of appropriate structural defects.

Ce résumé expose les affirmations des auteurs. BNTIC ne l’interprète pas comme une validation indépendante des résultats.