020ChemInform Abstract CO2 adsorption is shown to be a good technique for assaying the surface coverage of the MoS2 in alumina catalysts since it does not adsorb on the MoS2 phase. Corresponding results indicate that in sulfided catalysts up to about 8% Mo on alumina (calcination up to 500 rc C), the MoS2 is dispersed as a monolayer, whereas higher Mo to support surface ratios (calcination at > 500 rc C) can result in multilayer MoS2 phases. A model is proposed in which the MoS2 clusters are oriented flatwise to the support. A catalyst having a complete monolayer coverage in the oxide state results in only 23% coverage in the sulfide state after sulfiding. ESCA results on multilayer oxide catalysts showed qualitative correlation with calculated average numbers of multilayers present.
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