| 초록 |
Dimethyl ether (DME) can be directly synthesized via CO2 hydrogenation over bifunctional catalysts[1, 2], which suffered from individual deactivations caused by the incompatibility after integration of metal oxide and zeolite in an intimate proximity. Herein, we reported stabilized core-shell structured integration for enhanced catalyst stability and catalytic performance for CO2 hydrogenation to DME synthesis over Cu-ZnO-Al2O3 (CZA) and Ferrierite (FER) bifunctional catalyst. Two different integration methods with respect to CZA and FER bunctional catalysts, prepared by prevailing powder-mixing method (CZA/FER) and physically coating (CZA@FER) method, were carefully investigated and characterized. The results indicated that too intimate proximity between CZA and FER in CZA/FER will cause detrimental surface properties alterations, for instances, ion-exchanged-driven FER deactivation and variation in more vulnerable Cu active species (Cu+/(Cu+ +Cu0)) respectively. Boosted catalytic performance and enhanced stability witnessed in CZA@FER catalyst were attributed to its appropriate proximity and an efficient SiO2 barrier isolating CZA and FER. |
