Nature of the active sites in ethylene oligomerization catalyzed by Ni-containing molecular sieves: chemical and IR spectral investigation - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Journal of Physical Chemistry C Année : 2009

Nature of the active sites in ethylene oligomerization catalyzed by Ni-containing molecular sieves: chemical and IR spectral investigation

Résumé

Thermoactivated Ni-exchanged AlMCM-41 mesoporous materials were found to be very efficient heterogeneous catalysts for the ethylene oligomerization. By means of DRIFT spectroscopy of adsorbed CO it has been established that during the thermal activation under dry atmosphere, the Ni2+ ions were partially reduced into Ni+ ions. A very good correlation between the activation temperature and the catalytic activity in the ethylene oligomerization was observed. Both Ni+ and dehydrated Ni2+ ions were proposed as catalytic active sites in this process.

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Catalyse
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Dates et versions

hal-00433425 , version 1 (19-11-2009)

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Michael Lallemand, Annie Finiels, François Fajula, Vasile Hulea. Nature of the active sites in ethylene oligomerization catalyzed by Ni-containing molecular sieves: chemical and IR spectral investigation. Journal of Physical Chemistry C, 2009, 113 (47), pp.20360-20364. ⟨10.1021/jp9082932⟩. ⟨hal-00433425⟩
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