Kinetik der heterogenen Katalyse

Schwab, G.-M.; Noller, H.; Block, J.H.

doi:10.1007/978-3-7091-8040-2_3

Cited by 11 publications

(3 citation statements)

References 557 publications

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“…With this definition, a consistent system in the Aristotelian sense is set up if the system is complete. 2) In fundamental research, the temperature range corresponding to the energetic concept (T, < Ti) is the only relevant one for avoiding a contradiction [44], see validity range of the Theta-Rule, Eq. (4) in Part 1.…”

Section: Consistent Systemmentioning

confidence: 99%

“…The isokinetic temperature divides the temperature range into two inverse zones and is therefore called the inversion temperature [44] because the order of activity of a series of catalysts (activity pattern [37]) of one zone is opposite to the other. This well-known phenomenon [8] will be analyzed on the basis of the classical Aristotelian two-value principle where every proposition is either true or false (law of excluded middle or "tertium non datur" [45]).…”

Section: Consistent Systemmentioning

confidence: 99%

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Thermal deactivation of heterogeneous catalysts. Part 2: The compensation effect and the Catalytic Paradox

Kral

1988

Chem Eng & Technol

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The interpretation of the term "compensation" obscures a logical contradiction, the catalytic paradox, which is caused by inconsistent validity ranges of the Arrhenius parameters, the preexponential factor and the activation energy. For this reason, a theory which contains the Arrhenius parameters cannot be established for the entire system (whole temperature range) on the basis of classical logic. Only the subsystems can be consistent and complete. One subsystem is the range of the topocatalytic concept which is relevant for thermal deactivation, thermal bistability and for all reactions with surface dependence of activity. The other is the range of the energetic concept which is preferred in fundamental research. In order to complete the subsystems, new consistent symbols are introduced. The change of particle size caused by thermal deactivation can result in four possible particle size effects, two of which have been discussed in the literature.

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Section: Consistent Systemmentioning

confidence: 99%

Section: Consistent Systemmentioning

confidence: 99%

Thermal deactivation of heterogeneous catalysts. Part 2: The compensation effect and the Catalytic Paradox

Kral

1988

Chem Eng & Technol

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“…Disregarding the numerous interpretations put forward in the last 60 years and described in the comprehensive reviews [5, 10, 1 1, 15,16,44,46], only those of the Theta-Rule and compensation effect are considered.…”

Section: Interpretationsmentioning

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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Der Methanol‐Zerfall an Zinkoxyden verschiedener Elektronenkonzentration

Menold

1960

Chemie Ingenieur Technik

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Kinetik der heterogenen Katalyse

Cited by 11 publications

References 557 publications

Thermal deactivation of heterogeneous catalysts. Part 2: The compensation effect and the Catalytic Paradox

Thermal deactivation of heterogeneous catalysts. Part 2: The compensation effect and the Catalytic Paradox

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

Der Methanol‐Zerfall an Zinkoxyden verschiedener Elektronenkonzentration

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