Re-Co/Al2O3 (M) bimetallic catalysts were prepared by ball milling in a high-energy shaker mill using a WC container and four WC balls. The structure and activity of the Re-Co/Al2O3 (M) are compared to a Re-Co/Al2O3 (IM) sample prepared by the incipient wetness technique. The mechanically treated sample contains disordered, probably partly amorphous metal particles. Heat treatment of the Re-Co/Al2O3 (M) sample was carried out in hydrogen at 450 and 650°C. It affects the crystallinity and the catalytic properties of the metal particles. The rate measured for the CO hydrogenation over Re-Co/Al2O3 (IM) catalyst is significantly higher than that measured over the Re-Co/Al2O3 (M) sample. On the other hand, in the CH4 conversion to higher hydrocarbons, the Re-Co/Al2O3 (M) showed higher activity after treatment at 650 °C. The opposite behavior of the M and IM samples is explained by the changing morphology of the active sites responsible for the two different reactions.
- CH conversion
- CO hydrogenation
- Mechanical treatment on Co-Re/AlO
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