Stability and deactivation of Ru/NaY and Ru-Co/NaY catalysts in CO hydrogenation

Ru/NaY and Ru-Co/NaY samples pretreated by O-2/H-2(a), He/H-2 (b) and He/H-2/O-2/H-2 (c) have been investigated in the CO hydrogenation. The kinetic parameters (rate, energy of activation and the selectivity values) have been determined. The Anderson-Schulz-Flory distribution characterized by ct-values are more or less independent of the temperature. This behaviour of the differently treated samples is supported by the olefin/paraffin ratios. XPS measurements [1] indicated formation of the reduced bimetallic particles along with some minute amount of Co2+ ions. As a result, the major difference between mono- and bimetallic samples is mainly controlled by the location of the metal particles. The fate of reaction is significantly lower for Ru/NaY sample treated by (a) and (c). This is likely due to the location of the metal particles and the residence time of the species which are present during the chain growth.