| 초록 |
5-Hydroxymethylfurfural (5-HMF) is an excellent chemical platform molecule used for the generation of liquid fuel and fine chemicals. It can be synthesized by two-step series reactions using glucose as a starting material: i) isomerization of glucose to fructose over the Lewis acid site, and ii) dehydration of fructose to 5-HMF over the Brønsted acid site. In this study, we newly synthesized the dual-function core-shell zeolite acid catalyst through the steam-assisted crystallization method. Core and shell were composed of Sn- and H-zeolites corresponding to Lewis and Brønsted acid sites, respectively. Intensive studies using (S)TEM-EDS/elemental mapping, pyridine-IR, 29Si MAS NMR, and 119Sn MAS NMR clarified the physicochemical properties of the core and shell acid sites. From the overall results, we demonstrated that this dual function acid catalyst exhibited the higher 5-HMF yield when compared to the performances of individual H- and Sn-zeolites. |
