| 초록 |
The cobalt based catalyst for Fischer-Tropsch Synthesis is a better catalyst for producing long chain hydrocarbons. And the reactivity of cobalt based catalyst depended on the particle size, reducibility, and dispersion all of which were largely affected by the types of cobalt precursors and support. Among the conventional support, the alumina was mostly used due to mechanical strength and thermal stability. But It has high SMSI and higher value of point of zero charge (PZC, 8-10), of which feature made negative effect on the cobalt reducibility. The Aim of this work is to a make correlation of pre-treatment methods and FTS reaction. The treatment methods included the variation of cobalt precursor (Co-EDTA complex and cobalt nitrate) and also examined that the γ-Al2O3 was treated with HNO3 and NH4OH. The prepared catalyst was characterized by N2 physisorption,TPR,TEM and XRD analysis. And evaluated in a fixed-bed reactor system under 20 bar, 230 oC and fixed molar ratio of H2/CO=2. It was found that alumina treated by HNO3 supported cobalt oxide resulted in homogeneity of cobalt distribution.While the supported Co-EDTA showed low activity due to the presence of the smaller cobalt oxide. |
