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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.

Hydrocarbon synthesis from CO and H2O on supported ruthenium catalysts.