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Modulating Lattice Oxygen in Dual-functional Mo-V-O Mixed Oxides for Chemical Looping Oxidative Dehydrogenation.

07:00 EST 8th November 2019 | BioPortfolio

Summary of "Modulating Lattice Oxygen in Dual-functional Mo-V-O Mixed Oxides for Chemical Looping Oxidative Dehydrogenation."

Oxygen chemistry plays a pivotal role in numerous chemical, energy and environmental systems. Particularly, selective cleavage of C-H bonds by metal oxo species is highly desirable in the catalytic dehydrogenation of light alkanes. However, high selectivity of alkene is usually hampered through consecutive oxygenation reactions in conventional oxidative dehydrogenation (ODH) scheme. Herein, we show that dual-functional Mo-V-O mixed oxides selectively convert propane to propylene via an alternative chemical looping oxidative dehydrogenation (CL-ODH) approach. At 500 °C, we obtain 89% propylene selectivity at 36% pro-pane conversion over 100 dehydrogenation-regeneration cycles. We attribute such exceptional propylene yield-which far exceeds that of previously reported ODH catalysts-to the involvement and precise modulation of bulk lattice oxygen via atomic-scale doping of Mo, and show that increasing the binding energy of V-O bonds is critical to enhance the selectivity of propylene. This work provides the fundamen-tal understanding of metal-oxygen chemistry and a promising strategy for alkane dehydrogenation.

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This article was published in the following journal.

Name: Journal of the American Chemical Society
ISSN: 1520-5126
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Binary compounds of oxygen containing the anion O(2-). The anion combines with metals to form alkaline oxides and non-metals to form acidic oxides.

Widely distributed enzymes that carry out oxidation-reduction reactions in which one atom of the oxygen molecule is incorporated into the organic substrate; the other oxygen atom is reduced and combined with hydrogen ions to form water. They are also known as monooxygenases or hydroxylases. These reactions require two substrates as reductants for each of the two oxygen atoms. There are different classes of monooxygenases depending on the type of hydrogen-providing cosubstrate (COENZYMES) required in the mixed-function oxidation.

Heterocyclic compounds in which an oxygen is attached to a cyclic nitrogen.

Oxides of a ring compound having atoms other than carbon in its ring.

Inorganic oxides that contain nitrogen.

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