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Metalloaded zeolite films with bi-modal porosity for selective detection of carbon monoxide

12 August 2014

by Louwanda Lakiss, Sébastien Thomas, Philippe Bazin, Vincent de Waele, Svetlana Mintova

in Microporous and Mesoporous Materials

DOI: 10.1016/j.micromeso.2014.08.001

1-s2.0-S1387181114004259-fx1

Highlights

• Preparation of metal containing (Pt, Pd) zeolite Beta nanocrystals.
• Assembly of metal containing zeolite crystals in thin films.
• Optical properties of metal containing zeolite films.
• Detection of carbon monoxide, methanol and a mixture of both with zeolite films.

Abstract
The assembly of metal containing (Pt and Pd) zeolite Beta nanocrystals in thin films retaining a bi-modal porosity (micropores of 0.73 nm and mesopores of 2.3-2.6 nm) is presented. The high porosity of metal loaded films was examined by adsorption of probe molecules (water and toluene). Besides, the optical properties of the films including surface roughness (10 nm), thickness (200-500 nm), and mechanical stability (Young’s modulus of 0.7-1 GPa) are determined. The zeolite films are further used for detection of carbon monoxide as a single analyte and in a mixture with methanol at different temperatures; it is found that 70 % of the Pt and Pd surfaces remain accessible for the CO, but higher partial pressure of the analytes is needed to reach the saturation level.

Keywords
Zeolite Beta; Nanocrystals; Metal clusters; Films; Porosity; Carbon monoxide

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