Fabrication of b‐Oriented MFI Zeolite Films under Neutral Conditions without the Use of Hydrogen Fluoride1. (17th March 2015)

• Record Type: Journal Article
• Authors: Peng, Yong; Lu, Xiaofei; Wang, Zhengbao; Yan, Yushan
• Is Part Of: Angewandte Chemie. Volume 127:Number 19(2015)
• Page Start: 5801
• Page End: 5804
• Publication Date: 2015-03-17
• Subjects: Chemistry -- Periodicals; 540
• DOI: 10.1002/ange.201412482
• Languages: English
• ISSNs: 0044-8249

Abstract

<abstract abstract-type="main" xml:lang="en"> <title>Abstract</title> <p>The fabrication of MFI zeolite films with particular <italic>b</italic>‐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/H₂O without the use of HF and successfully synthesize highly <italic>b</italic>‐oriented MFI zeolite films on glass‐plate substrates by secondary growth. The localized weak alkaline environment created by the dissolved Na₂O 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 <italic>b</italic>‐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.</p> </abstract>