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1 Polish Journal of Chemistry

1 2004

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Morphology Study of Co/SiO2 Model Catalyst by Electron Microscopy. Effect of Oxidation-Reduction Treatment

Potoczna-Petru D., Kępiński L., Krajczyk L.

Polish Journal of Chemistry

2004

Vol.78 /nr 11-12

2205-2212

Effect of pretreatment in air (500-1000°C) of Co/SiO2model catalysts on morphology of Co phase formed upon reduction at 700°C in H2 for 4 h has been investigated by electron microscopy. The model catalysts were thin cobalt films (1 and 4 nm thick) on an amorphous layer of SiO2. It is concluded that the morphology of formed Co particles depends on Co loading, state of the surface support and Co-silica interaction in the oxidized state. The size distribution of Co particles and Co dispersion in samples subjected to various pretreatment are discussed. The highest dispersion of Co was observed for samples (4 nm thick) preheated at 800°C.