1982 Volume 1982 Issue 2 Pages 170-176
The reaction mechanism of CO hydrogenation to form hydrocarbons over ruthenium catalysts was investigated. It was confirmed that surface hydrocarbon species accumulated on a limited part of the ruthenium catalyst during the CO-H2 reaction, while most of the surface were covered by molecularly adsorbed carbon monoxide as shown in Figs.1 and 2. The role of these surface hydrocarbon species in the reaction was examined by the carbon 13 distribution (Fig, 3). The reactivity of deposited carbon formed by Boudouard reaction was also studied by means of carbon 13 (Fig.4). From the behavior of these surface species under the reaction conditions, it was concluded that all of the hydrocarbon products were produced via dissociatively adsorbed CO without CO insertion, and that C1 intermediate species had high mobility on the catalyst surface enough to react with each other. The effect of the particle size of ruthenium on the reaction was also investigated. The catalyst with smaller particle size exhibited lower activity because of the inhibition of CO dissociation by multiple adsorption of CO.
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