Nanosized Na-EMT and Li-EMT zeolites: selective sorption of water and methanol studied by a combined IR and TG approach

Hacan Ali Ahmad; Sébastien Thomas; Philippe Bazin; Aurélie Vicente; Christian Fernandez; Hussein Awala; Svetlana Mintova

doi:10.1039/c6cp05766g

Nanosized Na-EMT and Li-EMT zeolites: selective sorption of water and methanol studied by a combined IR and TG approach

Phys Chem Chem Phys. 2016 Nov 9;18(44):30585-30594. doi: 10.1039/c6cp05766g.

Authors

Hacan Ali Ahmad¹, Sébastien Thomas¹, Philippe Bazin¹, Aurélie Vicente¹, Christian Fernandez¹, Hussein Awala¹, Svetlana Mintova¹

Affiliation

¹ Normandie Université, ENSICAEN, UNICAEN, CNRS, Laboratoire Catalyse et Spectrochimie, 6 Boulevard Maréchal Juin, 14050 Caen, France. mintova@ensicaen.fr.

PMID: 27785497
DOI: 10.1039/c6cp05766g

Abstract

Nanosized EMT-type zeolite crystals in sodium (Na-EMT) and ion-exchanged lithium (Li-EMT) forms were prepared. The sorption behavior of Li(Na)-EMT samples towards water, methanol and a mixture of both (50 : 50) was studied by combined thermogravimetric and infrared spectroscopic methods. The stability of the samples prior to and after the sorption measurements in two subsequent cycles was confirmed by X-ray diffraction, N₂ sorption and NMR spectroscopy. The high sorption capacity of the Li-EMT sample towards water was demonstrated. It was found that the methanol is replaced by water faster in the Li-EMT sample in comparison to the Na-EMT sample. At low temperature, the methanol shows weak adsorption on each cationic site and no side products during desorption for both samples were obtained.