Abstract
The interaction of propylene with a number of complex oxide catalysts has been investigated by means of thermal desorption. The results indicate that propylene is adsorbed on only one type of active site and that this site is energetically similar for all the selective oxidation catalysts tested. The adsorbed propylene can react at the site to form acrolein via two different mechanisms. One of the mechanisms involves lattice oxygen, and the other, adsorbed oxygen, but in both cases the acrolein is derived from a common hydrocarbon intermediate. On one catalyst, a modified cobalt molybdate, evidence is given which shows that the rate-determining step in the selective oxidation of propylene is the desorption of acrolein and not the surface reaction.
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