(206e) Highly Active and Selective Bifunctional Catalyst for One-Step DME Synthesis By CO2 Hydrogenation

In this work, a highly active and selective Cu-ZnO-Al₂O₃ catalyst with high BET surface area and Cu surface area was prepared using co-precipitation method. The Cu-ZnO based catalysts were systematically characterized and a bifunctional catalyst constituted by Cu-ZnO based catalyst and HZSM-5 was studied for one-step dimethyl ether (DME) synthesis by CO₂ hydrogenation. The effects of preparation conditions, reaction temperature, and pressure on DME synthesis were investigated and the optimum reaction conditions were determined. The optimized catalyst showed a BET surface area of 128 m²/g and a Cu surface area of over 59.1 m²/g and demonstrated a high catalytic activity of CO₂ hydrogenation and high DME selectivity. A long term stability test of the catalyst further verified the excellent performance of the catalysts. The high activity and selectivity of the catalysts were attributed to the microstructure of the catalysts, which can be greatly affected by the catalyst preparation process.