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The kinetics of the oxidation of 1-butene and butadiene over a vanadium-phosphorus mixed oxide catalyst prepared reduction of V,O, in an organic medium were investigated. Increased 1-butene concentration in the feed strongly the rate of maleic anhydride formation but did not affect the rate of formation of the other products (methyl ketone, crotonaldehyde, acetaldehyde, and carbon oxides). The inhibition was interpreted by a Langmuir- type model where the ratedetermining step is the reaction between adsorbed oxygen and the butadiene adsorbed on two adjacent sites. The rates of formation of the other byproducts are by expressions which correspond to the reaction between 1-butene or butadiene adsorbed on one site adsorbed or gaseous oxygen. Satisfactory fit of the derived rate expression with the experimental data was
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Cavani et al. (1983) studied this question.
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