Relationship between single and bulk mechanical properties for zeolite ZSM5 spray-dried particles--颗粒学报PARTICUOLOGY

Marigo, M., Cairns, D. L., Bowen, J., Ingram, A., & Stitt, E. H. (2014). Relationship between single and bulk mechanical properties for zeolite ZSM5 spray-dried particles. Particuology, 14, 130–138. https://doi.org/10.1016/j.partic.2013.05.006

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

M. Marigo ^{a b *}, D.L. Cairns ^a, J. Bowen ^b, A. Ingram ^b, E.H. Stitt ^a

a Johnson Matthey Technology Centre, P.O. Box 1, Belasis Avenue, Billingham, Cleveland TS23 1LB, United Kingdom
b Centre for Formulation Engineering, Chemical Engineering, School of Engineering, The University of Birmingham, B15 2TT, United Kingdom

10.1016/j.partic.2013.05.006

Volume 14, June 2014, Pages 130-138

Received 30 August 2012, Revised 26 April 2013, Accepted 21 May 2013, Available online 8 September 2013.

E-mail: Michele.Marigo@matthey.com

Highlights

• Mechanical properties for the ZSM5 zeolite particles were characterized.

• Particle bulk compression was used to show the influence of single particle mechanical properties.

• Single particle compression and nanoindentation were used for testing individual particles.

• Adams model was shown to be suitable for describing the bulk compression.

• The predicted Adams apparent strength was in good agreement with the single particle strength.

Abstract

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 properties 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.

Graphical abstract

Keywords

Zeolite particle; Flowability; Powder flow function; Effective angle of internal friction; Schulze shear cell; Nanoindentation; Single particle compression; Bulk compression

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