Thermochemical stress development in ceramic catalyst supports

J. J. Thiart, S. M. Bradshaw, Hendrik J Viljoen, V. Hlavacek

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

Spherical catalyst supports of α-alumina are often used in packed-bed reactors. Exothermic reactions on the surface of the sphere can jump to the ignited state due to fluctuations in the bulk stream. The temperature field associated with the ignition creates large stresses within the support. Results are presented for a first-order reaction which ignites when the concentration in the bulk stream is suddenly increased. The thermoelastic equations are solved for constant and temperature-dependent material properties and in both cases it is shown that stresses develop which exceed the failure strength of alumina. For a material such as AlN with a smaller linear expansion coefficient and a larger thermal conductivity, the stresses in the material do not exceed the breaking strength.

Original languageEnglish (US)
Pages (from-to)1925-1932
Number of pages8
JournalChemical Engineering Science
Volume48
Issue number11
DOIs
StatePublished - 1993

Fingerprint

Catalyst supports
Aluminum Oxide
Alumina
Exothermic reactions
Packed beds
Ignition
Thermal conductivity
Materials properties
Temperature distribution
Temperature

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)
  • Industrial and Manufacturing Engineering

Cite this

Thermochemical stress development in ceramic catalyst supports. / Thiart, J. J.; Bradshaw, S. M.; Viljoen, Hendrik J; Hlavacek, V.

In: Chemical Engineering Science, Vol. 48, No. 11, 1993, p. 1925-1932.

Research output: Contribution to journalArticle

Thiart, J. J. ; Bradshaw, S. M. ; Viljoen, Hendrik J ; Hlavacek, V. / Thermochemical stress development in ceramic catalyst supports. In: Chemical Engineering Science. 1993 ; Vol. 48, No. 11. pp. 1925-1932.
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