Journal
ACS CATALYSIS
Volume 8, Issue 2, Pages 1173-1177Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acscatal.7b03833
Keywords
propene oxidation; acrolein; allyl alcohol; intermediate; bismuth molybdate; quasi-catalytic approach; product extraction; kinetic isotope effect
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Funding
- State Assignment for the Boreskov Institute of Catalysis (Siberian Branch, Russian Academy of Sciences) [0303-2016-0006]
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The generally accepted three-step mechanism of propene oxidation to acrolein includes abstraction of two hydrogen atoms and addition of one oxygen atom. The first step is a well-known H-abstraction from the methyl group. The sequence of two other steps is unclear. We investigated the reaction in quasi-catalytic mode at 100-200 degrees C with extraction and analysis of accumulated surface products. The reaction intermediate, surface ether of allyl alcohol, was identified. This strongly proves that O-addition precedes the second H-abstraction. Activation energy and kinetic isotope effect of the quasi-catalytic reaction correlate with appropriate parameters of the conventional catalytic process.
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