Über die katalytischen Fähigkeiten von Sinterkörpern aus Eisen

Hüttig, Gustav F.; Žagar, Ludvik; Honak, E. R.

doi:10.1007/bf01044206

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Modified Theta-rule and No Compensation Effect1

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1988

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“…Huttig [40] reported an interesting example, using iron catalysts for the decomposition of ammonia. The activation energy was not influenced by the preparation temperature but by the type of the precursor material.…”

Section: Modified Theta-rule and No Compensation Effectmentioning

confidence: 99%

Thermal deactivation of heterogeneous catalyst, part 1. The theta‐rule ‐ a critical review

Kral

1988

Chem Eng & Technol

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Thermal deactivation can be described either by deactivation kinetics or by the isokinetic effect. The latter expression is used synonymously with the "compensation effect" and the "ThetaRule". An examination of the original literature shows that only the compensation effect is applicable to thermal deactivation but not the Theta-Rule. The introduction of the preparation temperature as a parameter of the compensation effect results in a "modified Theta-Rule", which describes the experimental data and is proposed for the non-separable kinetics. The consequence of the observed deviations from the validity range of the Theta-Rule is that the activation energy cannot be used as a universal activity criterion.

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Section: Modified Theta-rule and No Compensation Effectmentioning

confidence: 99%