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• W1973998296 abstract "The oxidation and ammoxidation of allyl alcohol over MoO3, Bi2O3 · nMoO3 (n = 0, 1, 3), and a multicomponent catalyst (Ma2+Mb3+BixMoyOz) have been studied as a method of generating σ-allyl complexes analogous to those formed in the selective oxidation of propylene to acrolein. Adsorption experiments and studies using allyl alcohol-1,1-d2 and −3,3-d2 reveal the role of acid/ether-forming sites and oxidation/acrolein-forming sites in the equilibration of C-1 and C-3 of allyl alcohol, and establish hydrogen abstraction as the rate-determining step with kHkD ≅ 2.5 (320 °C, oxidation) and 2.1 (430 °C, ammoxidation). Relative product distributions for the catalysts studied show the importance of bismuth in the rate enhancement of the hydrogen abstraction step. These results are interpreted in terms of a selective propylene oxidation mechanism in which the initially formed π-complex collapses to an O σ-complex prior to the second hydrogen abstraction to form reduced catalyst and acrolein. In ammoxidation, the analogous N σ-complex undergoes two hydrogen abstractions to produce acrylonitrile." @default.
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• W1973998296 date "1980-05-01" @default.
• W1973998296 modified "2023-10-11" @default.
• W1973998296 title "Aspects of selective oxidation and ammoxidation mechanisms over bismuth molybdate catalysts *1II. Allyl alcohol as a probe for the allylic intermediate" @default.
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• W1973998296 doi "https://doi.org/10.1016/0021-9517(80)90076-7" @default.
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