Abstract
Oxidation of glucose to gluconic and glucaric acid using molecular O2 in aqueous solution is an environmentally friendlier alternative to the conventional method, which uses nitric acid as the oxidant. However, obtaining a satisfactory yield of the desirable product, glucaric acid, especially under base-free conditions, is still a challenge. In this paper, optimization of Pt-based mono- and bimetallic catalysts is reported by tuning four factors: support type, synthesis method, reductant used in the synthesis, and choice of the second metal. All four of these factors influence the glucaric acid selectivity. Among the tested combinations, the Pt–Cu/TiO2 bimetallic catalyst showed ∼60% glucaric acid selectivity in one-step glucose oxidation under base-free conditions at 90 °C and 15 bar O2. The catalyst consists of Pt metal particles (∼2.8 nm diameter on average) with a dominant presence of the alloyed Pt–Cu phase, as confirmed by X-ray diffraction and transmission electron microscopy analyses. These result...
Published Version
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call