Abstract
CD 2CHCH 3 was oxidized over bismuth molybdate, tin-antimony mixed oxides, and supported molybdenum and vanadium oxide catalysts. The deuterium retention is high (>90%) in the recovered propene. Percentage retentions of deuterium in the acrolein agree with literature data when bismuth molybdate is used as catalyst. On SbSnO and supported Mo and V oxides, no isotope effect is noticed for the abstraction of the second hydrogen from the olefin. The slow step of the reaction may therefore be different for the oxidation of propene on BiMoO and SbSnO. The ethanal produced by oxidation of CD 2CHCH 3 contains only minor amounts of deuterium, whatever the catalyst used. It is suggested that partial oxidation of propene to acrolein and CC bond rupture are parallel reactions which involve different intermediates. Possible mechanisms adapted from organic chemistry are presented to explain these findings.
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