Abstract
Cobalt clusters prepared by reducing CoNaY with hydrogen at 500°C were characterized by ferromagnetic resonance (FMR) spectroscopy and carbon monoxide hydrogenation as a probe reaction. Two different amounts of cobalt ions in CoNaY (4.5 and 7 wt.% cobalt loading, Co-IE-4.5 and Co-IE-7) were prepared by an ion-exchange method and NaY of 10 wt.% of cobalt loading (Co-IM-10) was prepared by the incipient wetness method in order to study the effect of cobalt loadings on the location and size of cobalt clusters produced. FMR characterization of Co-IE-4.5 after various pretreatments and different catalytic properties of Co-IE-4.5, Co-IE-7 and Co-IM-10 in the carbon monoxide hydrogenation reaction suggested that cobalt clusters of size between 5Åand 13Åwhich can not be sintered at 500°C were prepared by controlling the reduction period and the concentration of cobalt ions to be reduced in CoNaY.
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