An In-Situ Growth Strategy for Core-Shell Cua-Znb-Ox/ZSM-5@S-1 to Boost Dimethyl Ether Synthesis from CO2 Hydrogenation

Abstract

The hydrogenation of CO2 to dimethyl ether (DME) is often limited by low selectivity and poor catalyst stability. Herein, we report a core–shell zeolite–supported catalyst, denoted as Cua–Znb–Ox/ZSM–5@S–1, for efficient CO2–to–DME conversion. Compared with single–zeolite supported catalysts, the core–shell catalyst exhibits markedly enhanced DME selectivity and long–term stability. Under 260 °C and 5.0 MPa, the optimized Cu6–Zn9–Ox/ZSM–5@S–1 achieves 22.3% CO2 conversion and 85.9% DME selectivity while maintaining stable performance over 200 h. Characterizations reveal that the in–situ grown S–1 shell forms an effective interface with the ZSM–5 core, which promotes metal redispersion and increases the density of active Cu+–ZnOx sites.