Shear-thickening behavior of Fe-ZSM5 zeolite slurry and its removal with alumina/boehmites

Shear-thickening behavior of Fe-ZSM5 zeolite slurry and its removal with alumina/boehmites A cryogenic scanning electron microscopy (cryo-SEM) technique was used to explore the shear-thickening behavior of Fe-ZSM5 zeolite pastes and to discover its underlying mechanism. Bare Fe-ZSM5 zeolite samples were found to contain agglomerations, which may break the flow of the pastes and cause shear-thickening behaviors. However, the shear-thickening behaviors can be eliminated by the addition of halloysite and various boehmites because of improved particle packing. Furthermore, compared with pure Fe-ZSM5 zeolite samples and its composite samples with halloysite, the samples with boehmite (Pural SB or Disperal) additions exhibited network structures in their cryo-SEM images; these structures could facilitate the storage and release of flow water, smooth paste flow, and avoid shear-thickening. By contrast, another boehmite (Versal 250) formed agglomerations rather than network structures after being added to the Fe-ZSM5 zeolite paste and resulted in shear-thickening behavior. Consequently, the results suggest that these network structures play key roles in eliminating the shear-thickening behavior. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png International Journal of Minerals, Metallurgy, and Materials Springer Journals

Shear-thickening behavior of Fe-ZSM5 zeolite slurry and its removal with alumina/boehmites

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Publisher
University of Science and Technology Beijing
Copyright
Copyright © 2018 by University of Science and Technology Beijing and Springer-Verlag GmbH Germany, part of Springer Nature
Subject
Materials Science; Materials Science, general; Metallic Materials; Characterization and Evaluation of Materials; Ceramics, Glass, Composites, Natural Materials; Surfaces and Interfaces, Thin Films; Tribology, Corrosion and Coatings
ISSN
1674-4799
eISSN
1869-103X
D.O.I.
10.1007/s12613-018-1615-6
Publisher site
See Article on Publisher Site

Abstract

A cryogenic scanning electron microscopy (cryo-SEM) technique was used to explore the shear-thickening behavior of Fe-ZSM5 zeolite pastes and to discover its underlying mechanism. Bare Fe-ZSM5 zeolite samples were found to contain agglomerations, which may break the flow of the pastes and cause shear-thickening behaviors. However, the shear-thickening behaviors can be eliminated by the addition of halloysite and various boehmites because of improved particle packing. Furthermore, compared with pure Fe-ZSM5 zeolite samples and its composite samples with halloysite, the samples with boehmite (Pural SB or Disperal) additions exhibited network structures in their cryo-SEM images; these structures could facilitate the storage and release of flow water, smooth paste flow, and avoid shear-thickening. By contrast, another boehmite (Versal 250) formed agglomerations rather than network structures after being added to the Fe-ZSM5 zeolite paste and resulted in shear-thickening behavior. Consequently, the results suggest that these network structures play key roles in eliminating the shear-thickening behavior.

Journal

International Journal of Minerals, Metallurgy, and MaterialsSpringer Journals

Published: May 29, 2018

References

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