The particle size of cobalt in a Co/TiO, catalyst increased with increasing reduction temperature up to 600 OC. At 700 OC, where the phase transformation of TiO, from anatase to rutile occurred, the cobalt particles redispersed to individual crystallites. This redispersion has been confirmed by measuring the specific activity of the cobalt catalyst for the hydrogenation of propene. The relation between the phase transformation of TiO, and the redispersion of cobalt has been studied kinetically using high-temperature X-ray diffraction spectroscopy.
Techniques to control metal particle size in a supported catalyst, where metal particles may be fixed on a support by forming chemical bonds with oxygen atoms in a support, were investigated. The effect of metal particle size on a reaction selectivity was elucidated in terms of the ratio of numbers of the edge and corner atoms to those of the surface total atoms in the metal crystallites.
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