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Highly Oriented Growth of Catalytically Active Zeolite ZSM‐5 Films with a Broad Range of Si/Al Ratios
Author(s) -
Fu Donglong,
Schmidt Joel E.,
Ristanović Zoran,
Chowdhury Abhishek Dutta,
Meirer Florian,
Weckhuysen Bert M.
Publication year - 2017
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.201704846
Subject(s) - zeolite , catalysis , zsm 5 , materials science , chemical engineering , methanol , diffuse reflectance infrared fourier transform , fluorescence , spectroscopy , mass spectrometry , chemistry , organic chemistry , optics , chromatography , photocatalysis , physics , quantum mechanics , engineering
Abstract Highly b ‐oriented zeolite ZSM‐5 films are critical for applications in catalysis and separations and may serve as models to study diffusion and catalytic properties in single zeolite channels. However, the introduction of catalytically active Al 3+ usually disrupts the orientation of zeolite films. Herein, using structure‐directing agents with hydroxy groups, we demonstrate a new method to prepare highly b ‐oriented zeolite ZSM‐5 films with a broad range of Si/Al ratios (Si/Al=45 to ∞). Fluorescence micro‐(spectro)scopy was used to monitor misoriented microstructures, which are invisible to X‐ray diffraction, and show Al 3+ framework incorporation and illustrate the differences between misoriented and b ‐oriented films. The methanol‐to‐hydrocarbons process was studied by operando UV/Vis diffuse reflectance micro‐spectroscopy with on‐line mass spectrometry, showing that the b ‐oriented zeolite ZSM‐5 films are active and stable under realistic process conditions.