Abstract:
Direct synthesis of dimethyl ether (DME) from syngas has been investigated on the hybrid catalysts, Cu/ZnO-HZSM-5. The Cu/ZnO catalysts were prepared by ultrasonic spray technique. Copper nitrate, zinc nitrate, ammonium carbonate were used as the precursors and mechanically mixed with HZSM-5. This research studied effect of the concentration of copper/zinc nitrate prepared by ultrasonic spray technique comparison with co-precipitation method. The catalysts were characterized by BET, EDX, XRD, SEM, TEM and TPR. The experimental results indicated that catalyst prepared by ultrasonic spray technique has morphology like-spherical, rod and planar with average size of 30-100 nm. The activity of catalyst prepared by ultrasonic spray technique comparison with co-precipitation method showed the catalyst prepared by ultrasonic spray was higher than co-precipitation method. The 372CZH catalyst prepared by ultrasonic spray technique exhibited the highest CO conversion of 28.9% with DME selectivity of 85.2% at optimum conditions: temperature of 170 °C; pressure 40 Bar; gas flow rate 20 mL/min; methanol 40 mL and weight ratio of catalyst Cu/ZnO-HZSM-5 = 2:1