(671f) Catalytic Conversion of Glucose to Tartaric Acid over Synergistic Aupt/TiO2 Catalysts
AIChE Annual Meeting
Tuesday, November 17, 2020 - 9:15am to 9:30am
In this work, conversion and selectivity of different metal catalysts, including Au, Pt, AuM (M: Pt, Pd, Mn, Cu, Fe) supported by TiO2, were studied for glucose oxidation. It is found that AuPt/TiO2 catalyst outperformed other candidates in terms of conversion and selectivity. Compared with monometallic Pt/TiO2 and Au/TiO2 catalysts, the bimetallic AuPt/TiO2 catalyst showed remarkable catalytic performances for conversion of glucose (X ~ 100%) at 110 oC. Meanwhile, selectivity of TA is approximately 50%, suggesting that AuPt/TiO2 synergistically leads to formation of C4 products under reaction condition.
Based on the preliminary studies, we also conducted structure sensitivity analysis for oxidation of glucose and gluconic acid to TA, with the aim at understanding possible reaction mechanism on catalyst surface. Experimental studies have demonstrated that C-H and C=O bond activation tend to follow Ï-Ï and Ï-Ï bonding mechanism on catalyst surface. The elrectronic reconfiguration contributes to the synergism of bimetallic AuPt/TiO2 catalysts for both C-H and C-C cleavage reactions. Meanwhile, kinetic modeling on catalytic conversion and electronic reconfiguration at Pt-Au interface will also be interpreted in details.