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Updated: Jan 30, 2026

Organic Structure-directing Agent-free Synthesis for *BEA-type Zeolite Membrane
Published on: February 22, 2020
Template-Free Synthesis of Highly b-Oriented MFI-Type Zeolite Thin Films by Seeded Secondary Growth
Fateme Banihashemi1,2, Amr F M Ibrahim1,3, Ali Akbar Babaluo2
1School for Engineering of Matter, Transport and Energy, Arizona State University, Tempe, AZ, 85287, USA.
Abstract:
Highly b-oriented, closely packed, MFI zeolite films are prepared on seeded stainless-steel plates using organic template-free, secondary growth solutions, containing aluminum sulfate as a crystallization agent. The number of a-oriented twin crystals is significantly reduced, and even eliminated, simply by restricting the pH value of the secondary growth solution to the narrow range of 11.1-11.3. Values of pH can be adjusted through the controlled addition of (NH4 )2 SO4 or H2 SO4 to secondary growth solutions of the composition (1 SiO2 :0.57 NaOH:137.5 H2 O:0.0050 (Al2 (SO4 )3 ⋅18 H2 O)) or by simply decreasing the molar composition of NaOH with no extra additives.
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