Shear-thickening behavior of Fe-ZSM5 zeolite slurry and its removal with alumina/boehmites |
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| Authors: | Xiao-guang Liu Yan Li Wen-dong Xue Jia-lin Sun Qian Tang |
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| Institution: | 1.Department of Inorganic Nonmetallic Materials, School of Materials Science and Engineering,University of Science and Technology Beijing,Beijing,China;2.Atmospheric Environment Department,Chinese Academy for Environmental Planning,Beijing,China |
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| 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. |
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