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Properties and applications of zeolites

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Properties and applications of zeolites ( properties-and-applications-zeolites )

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Black plate (226,1) Fig. 1. Schematic representation of zeolite ZSM-5. This has an intersecting two- dimensional channel structure. The first set of channels is straight and elliptical in cross section. The second set of channels intersects the straight channels at right angles, in a zig-zag pattern and are circular in cross section. This unique two- dimensional pore structure allows a molecule to move from one point in the catalyst to anywhere else in the particle. http://chemelab.ucsd.edu/methanol/imagesMTG/schematicZSM-5.gif Reproduced with permission (ideally locally to minimise transportation costs) and used with the minimum of processing: merely crushing the raw mineral into a powder may be all that is needed. Native sodalite often has an attractive blue colour due to unpaired electrons that have become trapped within its structure and is made into jewelry and ornamants (e.g. Figure 3). Natural zeolites are produced by the forces of volcanism (Figure 4), and are often associated with mountainous Fig. 2. Cage structure of sodalite. http://wikis.lib.ncsu.edu/images/8/8c/Z-s-1.png Reproduced with permission. 226 Christopher J. Rhodes

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