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Thermal deactivation of heterogeneous catalysts. Part 2: The compensation effect and the Catalytic Paradox
Author(s) -
Kral Hans
Publication year - 1988
Publication title -
chemical engineering and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.403
H-Index - 81
eISSN - 1521-4125
pISSN - 0930-7516
DOI - 10.1002/ceat.270110130
Subject(s) - arrhenius equation , thermodynamics , activation energy , range (aeronautics) , thermal , compensation (psychology) , chemistry , catalysis , atmospheric temperature range , particle (ecology) , statistical physics , chemical physics , theoretical physics , physics , materials science , organic chemistry , psychology , oceanography , psychoanalysis , composite material , geology
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 pre‐exponential 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.