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Longer lifetimes for a metal oxide

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Science  18 Nov 2016:
Vol. 354, Issue 6314, pp. 844-845
DOI: 10.1126/science.354.6314.844-f

Although heterogeneous molybdenum catalysts can convert cyclohexene to its epoxide with high conversion and selectivity, the catalysts deactivate quickly because the Mo species leach into solution. Noh et al. show that a more stable catalyst can be made by depositing Mo via a metallorganic complex onto the zirconium oxide nodes within the metal organic framework (MOF) NU-1000. After exposure to air to form the Mo oxide species, this catalyst showed activity comparable to that of epoxidation of Mo supported on ZrO2. However, the ZrO2 support lost 80% of its Mo after reaction, whereas no loss of Mo occurred for the MOF catalyst. Density functional theory calculations indicate that the loss of Mo(VI) from the MOF Zr node is energetically unfavorable.

Fragment of a clay pot discovered at Tepecik Çiftlik, Turkey

PHOTO: IMAGES & STORIES/ALAMY STOCK PHOTO

J. Am. Chem. Soc. 10.1021/jacs.6b08898 (2016).

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