Over Sn:Sb=3:l catalyst at 423-673 K the kinetics of oxidation and isomerization of 1-butene and cis- and trans-2-butene have been studied in a recirculatory batch reactor. The oxygen uptake of the catalysts was determined with a microbalance and kinetic parameters of oxidation were calculated. Comparison of the oxidation of the n-butenes demonstrates that both the conversion and the selectivity for butadiene are much lower in the reaction of both 2-butenes than in the oxidation of 1-butene. Since the double-bond isomerization (taking place over the Brönsted-type acidic sites of the catalyst) is a much slower reaction even at higher reaction temperatures, it was supposed that the only reaction step yielding butadiene is 1-butene→butadiene on an oxidation site.
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