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

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Trionfetti, C. and Crapanzano, S. and Babich, I.V. and Seshan, K. and Lefferts, L. (2009) Lithium ions incorporation in MgO for oxidative dehydrogenation/cracking of propane: Active site characterization and mechanism of regeneration. Catalysis Today, 145 (1-2). pp. 19-26. ISSN 0920-5861

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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.
Item Type:Article
Copyright:© 2009 Elsevier
Faculty:
Science and Technology (TNW)
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Link to this item:http://purl.utwente.nl/publications/79836
Official URL:http://dx.doi.org/10.1016/j.cattod.2008.06.018
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