| 초록 |
Dimethyl ether (DME), which has similar physical properties with LPG, is one of the attractive alternative fuel because of a lower emission of air-pollutants than that of the traditional diesel fuel. The direct synthesis of DME from syngas was investigated on Cu-ZnO-Al2O3 catalyst composited with the alumina, which was previously synthesized by the co-precipitation method using aluminum nitrate precursor and carbon black at a different Al/carbon black ratio. Solid-acid component of alumina was obtained by calcining the composite of aluminum precursor and carbon black. The active sites for hydrogenation of CO was prepared by using copper nitrate, zinc acetate and aluminum nitrate with a molar ratio of Cu/ZnO/Al2O3 = 6/2/1, and a weight ratio of Cu/Al2O3 = 1.4. At an optimum composite of Al/carbon black ratio, the surface area of the as-prepared Cu-ZnO-Al2O3/alumina was maximized and the maximum catalytic activity was obtained due to its higher surface area of metallic copper and larger amount of acid sites. The hybrid catalysts were characterized by TPR, NH3-TPD, XRD, and BET and so on. |
