Lithium ions incorporation in MgO for oxidative dehydrogenation/cracking of propane: Active site characterization and mechanism of regeneration

C. Trionfetti, S.D. Crapanzano, Igor V. Babych, Kulathuiyer Seshan, Leonardus Lefferts

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10 Citations (Scopus)

Abstract

In the case of Li-promoted MgO two different mechanisms for regeneration of the active site are found when varying the temperature between 550 and 700 °C. Propane titration showed that the active site is deactivated through formation of hydroxyl groups that are stable at 550 °C and below in absence of oxygen. On the contrary at 700 °C, propane pulses resulted in hydrocarbon activation, accompanied by evolution of water molecules. In addition, simultaneous evolution of hydrogen molecules pulsing propane indicate that ODH of propane follows a mixed heterogeneous–homogeneous radical chemistry. No COx was observed while pulsing propane at both temperatures. Moreover COx molecules were not detected even during catalyst regeneration by pulsing oxygen showing that Li/MgO materials are not affected by coke formation. Formation of COx molecules seems to be feasible exclusively by co-feeding propane and oxygen.
Original languageUndefined
Pages (from-to)19-26
Number of pages8
JournalCatalysis today
Volume145
Issue number1-2
DOIs
Publication statusPublished - 2009

Keywords

  • METIS-263332
  • Li-promoted MgO
  • Oxidative dehydrogenation/cracking of propane
  • De-hydroxylation reaction
  • Active site regeneration
  • IR-79836

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