This research realizes the direct transformation of biomass-based 5-hydroxymethylfurfural (HMF) into high-value 1,6-hexanediol (1,6-HDO) over a bifunctional Pd/Al-MCM-41 catalyst. Various metals (Pd, Pt, and Ni) supported on Al-MCM-41 catalysts were synthesized through the incipient wetness impregnation method. Experim...