Core-shell zeolite composite with enhanced selectivity for the separation of branched paraffin isomers

Gerhard D Pirngruber (1) , Catherine Laroche (1) , Michelle Maricar-Pichon (1) , Loic Rouleau (1) , Younes Bouizi (2) , Valentin Valtchev (3)

1 IFPEN - IFP Energies nouvelles
2 IJL - Institut Jean Lamour
3 LCS - Laboratoire catalyse et spectrochimie

A zeolite beta-silicalite-1 composite was prepared by growing polycrystalline silicalite-1 shells on single micron-sized zeolite beta crystals. The obtained core-shell material was employed for the separation of hexane isomers. Gravimetric uptake measurements revealed that the silicalite-1 shell acted as a membrane that controlled the transport to zeolite beta core. The positive impact of the silicalite-1 membrane on the separation of mono- and di-branched hexane isomers was confirmed by breakthrough experiments. The core-shell composite material allowed more selective separation of mono- and di-branched isomers than either of its components alone and had a significantly higher adsorption capacity than silicalite-1. (C) 2012 Elsevier Inc. All rights reserved.

Mots clés: Zeolite; Core-shell; Octane number; Separation; adsorption

Domaines: Chimie

Gerhard D Pirngruber, Catherine Laroche, Michelle Maricar-Pichon, Loic Rouleau, Younes Bouizi, et al.. Core-shell zeolite composite with enhanced selectivity for the separation of branched paraffin isomers. Microporous and Mesoporous Materials, 2013, 169, pp.212--217. ⟨10.1016/j.micromeso.2012.11.016⟩. ⟨hal-01840287⟩