Laser in der Chemie – wo stehen wir heute?

Kleinermanns, Karl; Wolfrum, J.

doi:10.1002/ange.19870990107

Cited by 28 publications

(1 citation statement)

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“…The assumption that the magnitude of E is to be identified with the activation of one particular bond is a subject of controversy (47,481, even with respect to homogeneous gas reactions [49]. New experimental laser studies of elementary reactions show deviations between the Arrhenius energy, the threshold energy and the energy of the activated state [50], and confirm Galwey's arguments. The theoretical doubts are supported by the following experimental results.…”

Section: Activation Energymentioning

confidence: 64%

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: Activation Energymentioning

confidence: 64%