Abstract
The Kolbel-Engelhardt (K-E) synthesis to produce hydrocarbons from CO and H2O was investigated under the reaction conditions of 523-543K and 0.61-3.13MPa, using supported ruthenium catalysts. The catalytic activity of ruthenium strongly depended on the type of catalyst support. The catalyst screening showed that Ru supported on TiO2 (anatase) and γ-Al2O3 showed relatively high catalytic activity and selectivity for hydrocarbon production. More enhanced activity of Ru was attained by use of a binary oxide of TiO2-SiO2 (90mole% TiO2). The Ru catalyst supported on the TiO2-SiO2 was less deactivated than the Al2O3-supported catalyst. The K-E synthesis on supported Ru catalysts appears to proceed via a sequential reaction pathway involving the water gas shift reaction and the Fischer-Tropsch synthesis. Increasing the reaction pressure slightly increased the conversion of CO and remarkably shifted the product distribution to higher molecular weight hydrocarbons.
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