in V
Sb Oxide Catalysts for the Oxidative Dehydrogenation of Light Paraffins
V. Yu. Bychkov*, M. Yu. Sinev*, and V. P. Vislovskii**
* Semenov Institute of Chemical Physics, Russian Academy of Sciences, Moscow, 117977 Russia
** Azerbaijan Institute of Inorganic and Physical Chemistry, Academy of Sciences of Azerbaijan, Baku, Azerbaijan
Received May 29, 2000
Abstract—Differential scanning calorimetry is used to study in situ the properties of strongly bound (lattice)
oxygen in vanadium-containing supported catalysts for the oxidative dehydrogenation of paraffins C2–C4. Evi-
dence is found that the process occurs via a stepwise redox mechanism with the participation of lattice oxygen
from the catalyst. When the supported component is modified by an antimony additive, the amount of reactive
oxygen increases and redox processes accelerate. Simultaneously, the rate of coke formation decreases. Addi-
tional modification by Bi and Ba leads to a further increase in the amount of reactive oxygen. In all cases, oxy-
gen bound to vanadium atoms is responsible for the redox properties of the systems. The observed effects are
analyzed from the standpoint of the ratio between different forms of active oxygen.
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