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Nanoporous ZSM-5 Crystals Coated with Silicalite-1 for Enhanced p-Xylene Separation

Tijdschriftbijdrage - Tijdschriftartikel

The growth of a silicalite-1 coating on ZSM-5 zeolite crystals is one of the surface modification methods allowing to improve its catalytic p-xylene selectivity. Aiming to understand this increase in p-xylene selectivity, the effect of silicalite-1 coating on the adsorptive properties of ZSM-5 was investigated. Pulse chromatographic experiments revealed the silicalite-1 coating improved the separation factors of p-xylene over o-xylene and m-xylene, resulting in a better chromatographic separation of p-xylene over m-xylene on silicalite/ZSM-5 compared to that on parent ZSM-5. Additionally, slower adsorption kinetics of m-xylene on silicalite/ZSM-5 compared to ZSM-5 was also confirmed by gravimetric adsorption measurements. It is concluded that the enhanced p-xylene selectivity is achieved by steric effects leading to a more pronounced exclusion of m-xylene in the outer silicalite-1 layer and a reduction in number of surface adsorption sites.
Tijdschrift: ACS Applied Nano Materials
ISSN: 2574-0970
Issue: 5
Volume: 2
Pagina's: 2642-2650
Jaar van publicatie:2019
Trefwoorden:ZSM-5, silicalite-1 coating, p-xylene selectivity, pulse chromatography, core-shell, zeolite
Toegankelijkheid:Open