Activity and Selectivity Regulation of Synthesis Gas Reaction over Supported Ruthenium Catalysts

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Abstract
The catalytic activities of supported ruthenium for synthesis-gas conversion to hydrocarbons was found to be in the following order: TiO2>Nb2O3>ZrO2>SiO2>Ta2O5>Al2O3>V2O5>Mo3>WO3>MnO2>ZnO Turnover frequencies of the supported ruthenium increased with decrease in dispersion of the metal particles for every carrier material. Even the activities per unit weight of metals were higher for low-dispersion ruthenium on Al2O3, TiO2, and ZrO2. The chain-growth probability of a hydrocarbon product, which is characterized by the Schulz-Flory distribution, increased markedly with decrease in the metal dispersion irrespective of the carrier material. The catalytic activity of ruthenium particles with a dispersion level of 0.7 or higher reached a ceiling level at about 0.5 MPa, whereas that of low dispersed ruthenium increased almost linearly with an increase in reaction pressure (up to at least 2.0 MPa).