Aluminium triplets in dealuminated zeolites detected by Al-27 NMR correlation spectroscopy

Nicolas Malicki (1) , Gregor Mali (2) , Anne-Agathe Quoineaud (3) , Patrick Bourges , Laurent J Simon , Frederic Thibault-Starzyk (1) , Christian Fernandez (1)

1 LCS - Laboratoire catalyse et spectrochimie
2 KI - National Institute of Chemistry [Llubljana]
3 IFPEN - IFP Energies nouvelles

Arrangements associating three aluminium atoms in dealuminated Y zeolites are for the first time detected using a combination of multiple-quantum MAS (MQMAS) and 2D double-quantum homonuclear NMR correlation spectroscopy. From these results, we propose a model describing the enhanced Bronsted acid sites in dealuminated Y zeolite, consisting in a configuration where framework aluminium pairs are interacting with cationic extra-framework aluminium atoms. (C) 2009 Elsevier Inc. All rights reserved.

Mots clés: Al-27 solid-state NMR; Enhanced acidity; Extra-framework aluminium; USY zeolite

Domaines: Chimie

Nicolas Malicki, Gregor Mali, Anne-Agathe Quoineaud, Patrick Bourges, Laurent J Simon, et al.. Aluminium triplets in dealuminated zeolites detected by Al-27 NMR correlation spectroscopy. Microporous and Mesoporous Materials, 2010, 129 (1-2), pp.100--105. ⟨10.1016/j.micromeso.2009.09.003⟩. ⟨hal-01840518⟩