Abstract
The mechanisms and kinetics leading to a loss of molybdenum from bismuth molybdate catalysts with SiO 2 and Al 2O 3 as supports, respectively, were studied as the basis of research into the reasons for the loss of molybdenum from single MoO 3 catalysts. It was found that the loss of molybdenum was due to the sublimation of MoO 2(OH) 2, formed by the reaction of active species with water vapor. The kinetics leading to the loss of molybdenum in the presence of water vapor are expressed as r=kVC 3.5 s. The difference in the rate of molybdenum loss from single MoO 3 catalysts and bismuth molybdate catalysts are discussed.
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