Abstract
Addition of manganese and molybdenum compounds to silica-supported rhodium catalysts results in a significant increase in their activity for synthesis gas conversion. The location of these promoter elements and their role in the CO H 2 reaction have been studied by various techniques. The available evidence suggests that manganese and molybdenum oxides partly cover the surface of the rhodium crystallites, thereby forming mixed oxides containing MeORh bonds, which cannot be completely reduced by treatment with hydrogen at 500 °C. A possible role of these mixed oxides is to weaken CO chemisorption, thereby increasing the surface concentration of hydrogen atoms.
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