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Preparation and High Permeance of SiO2-Modified Substrate Supported ZSM-5 Membrane by Pre-Seeding and Secondary Nucleation

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SiO2-modified substrate supported compact ZSM-5 membranes with high permeance were prepared using the secondary nucleation method. The synthesis mixture had a molar composition of 10Na2O:84SiO2: 100NaCl:5TPABr:3500H2O. In order to obtain high permeance, a SiO2 mesoporous top layer was added to the macroporous substrate in this study. The SEM images of the seed layer indicate that about 400–500 nm round shaped seeds consisting of 60 nm zeolites fully covered the modifying substrate. The XRD patterns of the zeolite membranes show the purity of the ZSM-5 crystal phase, and reveal the formation of a random orientation on the SiO2-modified substrate. The SEM images of the zeolite membranes indicate that the membranes consist of highly intergrown crystals, with a maximum thickness of about 30 μm. The results of gas permeability studies indicate that the SiO2-modified substrate supported ZSM-5 membranes show good permeance, with the maximum H2 permeance achieved being 12.5×10−7 mol s−1 m−2 Pa−1. The maximum H2/N2 and H2/CO permselectivities were 4.01 and 4.37 respectively, which are higher than those of the corresponding Knudsen diffusion. The method used resulted in high permeance, while keeping the sustainable permselectivity, and is therefore desirable for practical applications.
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Document Type: Research Article

Publication date: January 1, 2016

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  • Journal for Nanoscience and Nanotechnology (JNN) is an international and multidisciplinary peer-reviewed journal with a wide-ranging coverage, consolidating research activities in all areas of nanoscience and nanotechnology into a single and unique reference source. JNN is the first cross-disciplinary journal to publish original full research articles, rapid communications of important new scientific and technological findings, timely state-of-the-art reviews with author's photo and short biography, and current research news encompassing the fundamental and applied research in all disciplines of science, engineering and medicine.
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