| 초록 |
Ni/ZrO2-Al2O3 catalysts were prepared by different methods such as modified Pechini sol-gel, urea hydrolysis, and physical mixing, and characterized by N2 physisorption, XRD, TEM, XPS, and TPR technologies. The prepared catalysts were evaluated by the dry reforming of methane under temperature of 700 °C, atmospheric pressure, and space velocity of 25,000 h-1 in a fixed bed reactor system. It was found that the interaction between nickel and support in the dry reforming of methane depends on the preparation methods of catalyst, and plays an important role in terms of resistant to carbon formation. It was also found that Ni/ZrO2-Al2O3 catalyst prepared by Pechini sol-gel showed higher stability under tested conditions. It was considered that the catalytic stability in the dry reforming of methane over Ni/ZrO2-Al2O3 (PS) catalyst was maintained by the balance for the reaction of deposited carbon and oxygen intermediate derived from the dehydrogenation of methane and the dissociation of CO2. |
