| 초록 |
During the last two decades, several different pathways for converting cellulose into value-added chemicals have been explored. One of the promising pathways is the conversion of C6 sugars to levulinic acid (LA) via acid-catalyzed hydrolysis, followed by the transformation of LA to γ-valerolactone (GVL) by hydrogenation, and of GVL to valeric acid (VA) by ring-opening and subsequent hydrogenation. Herein, LA is converted into VA via one-pot cascade conversion over non-noble metal-based Nb-doped Cu on Zr-doped porous silica (Nb-Cu/ZPS). Under mild reaction conditions (150 °C and 3.0 MPa H2 for 4 h), LA was completely converted into VA in high yield (99.8%) in aqueous medium. The Lewis acid sites of ZPS enhanced the adsorption of LA on the catalyst surface, and both the Lewis and Brønsted acidity associated with Nb2O5 and the metallic Cu0 sites promoted catalysis of the cascade hydrogenation, ring cyclization, ring-opening, and hydrogenation reactions to produce VA from LA. |
