Research progress on hydrodeoxygenation of lignin model compounds using microporous molecular sieve-supported metal catalysts

Abstract

Lignin, which is widely present in nature, is a potential alternative to fossil fuels, and its catalytic conversion into high-value-added chemicals or fuels has significant application potential. Among various technologies, hydrodeoxygenation (HDO) is one of the most promising approaches for efficient lignin conversion. Microporous molecular sieve-supported metal bifunctional catalysts exhibit remarkable advantages in the HDO of lignin model compounds owing to their unique pore structures, tunable acidic sites, and metal-support synergistic effects. This review summarizes the recent research progress on the HDO of lignin model compounds over microporous molecular sieve-supported metal catalysts, with a focus on the role and advantages of microporous molecular sieves as catalyst supports as well as the influence mechanisms of different metal centers on the HDO reaction pathways and product selectivity of lignin derivatives. Finally, the major challenges and future research trends in this field are discussed.