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Relationship between single and bulk mechanical properties for zeolite ZSM5 spray-dried particles

Marigo, M.; Cairns, D. L.; Bowen, J.; Ingram, A. and Stitt, E. H. (2014). Relationship between single and bulk mechanical properties for zeolite ZSM5 spray-dried particles. Particuology, 14 pp. 130–138.

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In this work typical mechanical properties for a catalyst support material, ZSM5 (a spray-dried granular zeolite), have been measured in order to relate the bulk behaviour of the powder material to the single particle mechanical properties. Particle shape and size distribution of the powders, determined by laser diffraction and scanning electron microscopy (SEM), confirmed the spherical shape of the spray-dried particles. The excellent flowability of the material was assessed by typical methods such as the Hausner ratio and the Carr index. This was confirmed by bulk measurements of the particle–particle internal friction parameter and flow function using a Schulze shear cell, which also illustrated the low compressibility of the material. Single particle compression was used to characterize single particle mechanical proper-ties such as reduced elastic modulus and strength from Hertz contact mechanics theory. Comparison with surface properties obtained from nanoindentation suggests heterogeneity, the surface being harder than the core. In order to evaluate the relationship between single particle mechanical properties and bulk compression behaviour, uniaxial confined compression was carried out. It was determined that the Adams model was suitable for describing the bulk compression and furthermore that the Adams model parameter, apparent strength of single particles, was in good agreement with the single particle strength determined from single particle compression test.

Item Type: Journal Item
Copyright Holders: 2013 Chinese Society of Particuology and Institute of Process Engineering, Chinese Academy of Sciences.
ISSN: 1674-2001
Keywords: zeolite particle; flowability; powder flow function; effective angle of internal friction; Schulze shear cell; nanoindentation; single particle compression; bulk compression
Academic Unit/School: Faculty of Science, Technology, Engineering and Mathematics (STEM) > Engineering and Innovation
Faculty of Science, Technology, Engineering and Mathematics (STEM)
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Item ID: 43153
Depositing User: James Bowen
Date Deposited: 01 Jun 2015 08:55
Last Modified: 08 Dec 2018 17:02
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