X-Ray Absorption Edge Studies of Supported Cobalt Catalysts
Evidence is presented which suggests that the adsorption sites necessary to initiate the formation of the δ-phase (Co+2 ions occupying positions in the structure of the support) in supported cobalt catalysts are acid sites. In addition the δ-phase is found to be more difficult to reduce than the β-phase (Co3O4), and the presence of a competing ion (Ni+2) in the impregnating solution is found to increase the proportion of cobalt in the-phase. The assignment of octahedral coordination to the Co+2 ions in the δ-phase follows from measurements of the Co k-absorption edge in spinel-type compounds.
KeywordsTetrahedral Site Octahedral Coordination Tetrahedral Coordination Cobalt Catalyst Cobalt Nitrate
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