Abstract
The interaction among cobalt, molybdenum and silica in CoMo/SiO 2 catalysts has been investigated in a series of catalysts with the same overall composition and varying interaction among the components. XRD and DRIFTS give a rough indication of the phases present, and the formation of CoMoO 4 can be easily monitored. The formation of CoMoO 4 is observed in most of the catalysts due to the poor interaction between molybdenum oxide and silica. The presence of other minor, non-crystalline phases must be attested by other methods, such as, TPR and catalytic oxidation of carbon monoxide. The presence of “free” cobalt can be demonstrated by a low temperature peak in TPR. The catalytic oxidation of CO may function as a useful indicator for the interaction between cobalt and molybdenum, because the oxidation activity of cobalt species incorporated in a molybdate lattice (i.e. CoMoO 4) is considerably less than cobalt oxide.
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