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Molecules 2018, 23(1), 220; https://doi.org/10.3390/molecules23010220

Supported Zeolite Beta Layers via an Organic Template-Free Preparation Route

1
Department of Chemical Reaction Engineering, Friedrich-Alexander Universität Erlangen-Nürnberg, Egerlandstraße 3, 91058 Erlangen, Germany
2
Chemistry Department, Faculty of Science, King Abdulaziz University, 21589 Jeddah, Saudi Arabia
*
Author to whom correspondence should be addressed.
Received: 7 November 2017 / Revised: 11 January 2018 / Accepted: 15 January 2018 / Published: 21 January 2018
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Abstract

Layers of high silica zeolites, synthesized with an organic structure directing agent (OSDA) and grown onto porous support structures, frequently suffer from the thermal stress during the removal of OSDA via the calcination process. The different thermal expansion coefficients of the zeolite and the support material, especially when stainless steel is used as a support, causes enormous tension resulting in defect formation in the zeolite layer. However, the calcination is an easy procedure to decompose the OSDA in the pore system of the zeolite. Recently, methods to synthesize zeolite beta without the use of an organic structure directing agent have been described. In the present study, a seed-directed synthesis is used to prepare OSDA-free zeolite beta layers on stainless steel supports via an in situ preparation route. For the application as membrane, a porous stainless steel support has been chosen. The beta/stainless steel composites are characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM). To prove its possible application as a membrane, the beta/stainless steel composites were also tested by single gas permeances of H2, He, CO2, N2, and CH4. View Full-Text
Keywords: zeolite layer; zeolite beta; organic structure directing agent free; coatings; membranes zeolite layer; zeolite beta; organic structure directing agent free; coatings; membranes
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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Reuss, S.; Sanwald, D.; Schülein, M.; Schwieger, W.; Al-Thabaiti, S.A.; Mokhtar, M.; Basahel, S.N. Supported Zeolite Beta Layers via an Organic Template-Free Preparation Route. Molecules 2018, 23, 220.

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