Experimental and statistical assessments of the mechanical strength reliability of gamma alumina catalyst supports--颗粒学报PARTICUOLOGY

Samimi, A., Zakeri, M., Maleki, B., & Mohebbi-Kalhori, D. (2015). Experimental and statistical assessments of the mechanical strength reliability of gamma alumina catalyst supports. Particuology, 21, 74-81. https://doi.org/10.1016/j.partic.2014.10.002

Experimental and statistical assessments of the mechanical strength reliability of gamma alumina catalyst supports

Abdolreza Samimi ^*, Mozhgan Zakeri, Basir Maleki, Davod Mohebbi-Kalhori

Department of Chemical Engineering, University of Sistan and Baluchestan, Zahedan, Iran

10.1016/j.partic.2014.10.002

Volume 21, August 2015, Pages 74-81

Received 8 May 2014, Revised 28 August 2014, Accepted 2 October 2014, Available online 19 January 2015, Version of Record 6 June 2015.

E-mail: samimi683@yahoo.co.uk; a.samimi@eng.usb.ac.ir

Highlights

• Crushing strength of gamma alumina support was modeled using RSM to optimize support forming.

• The model was validated using analysis of variance.

• Reducing binder concentration and calcination temperature enhanced crushing strength.

• Reliable samples should have both high crushing strength and Weibull modulus.

Abstract

The mechanical strength of solid catalysts is considered an important factor in terms of ensuring the reliable performance of industrial reactors. In this work, a pelletizing method was used to form gamma alumina support for catalysts. Response surface methodology (RSM) was employed to analyze and model the effects of various manufacturing parameters on the crushing strength of the supports. These parameters were binder concentration, compaction pressure, calcination temperature, and drying mode. The suggested model was verified by applying an analysis of variance to assess its validity with regard to crushing strength. The mechanical reliability of various supports was also determined by calculating their Weibull modulus values through linear regression of the Weibull equation. The material with the highest mechanical strength reliability will have both a high mean crushing strength and a high Weibull modulus, and the best values obtained for a support in this work were 70.7 MPa and 6.63, respectively. The conditions used to form this sample were: 20 mass% binder concentration, 861 MPa compaction pressure, 466 °C calcination temperature, and gentle drying.

Graphical abstract

Keywords

Crushing strength; Brittle material; Weibull modulus; Pelletizing; Response surface methodology

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