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Fabrication of b ‐Oriented MFI Zeolite Films under Neutral Conditions without the Use of Hydrogen Fluoride
Author(s) -
Peng Yong,
Lu Xiaofei,
Wang Zhengbao,
Yan Yushan
Publication year - 2015
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/anie.201412482
Subject(s) - zeolite , hydrofluoric acid , fumed silica , materials science , hydrogen fluoride , fabrication , chemical engineering , substrate (aquarium) , molecular sieve , inorganic chemistry , catalysis , chemistry , composite material , organic chemistry , metallurgy , medicine , alternative medicine , oceanography , geology , pathology , engineering
The fabrication of MFI zeolite films with particular b ‐axis orientation is especially fascinating. Unlike the conventional alkaline or hydrofluoric acid (HF) assisted neutral synthesis route, here we develop a novel neutral synthesis solution system of TPABr/fumed silica/H 2 O without the use of HF and successfully synthesize highly b ‐oriented MFI zeolite films on glass‐plate substrates by secondary growth. The localized weak alkaline environment created by the dissolved Na 2 O species from the substrate is identified as the key factor for the depolymerization of fumed silica and subsequently the in‐plane growth of zeolite seed layers. Continuous b ‐oriented MFI films can also be synthesized on other substrates in the presence of a glass plate or a trace amount of NaOH, which making our neutral synthesis route promising for the direct synthesis of MFI zeolite films and membranes on various substrates.