In this case equality (1) is attained only at ~[i/.ti --= 0 (C iS the vector of concentrations', T is the temperature and /ai(c ~ T) is the potential of the i-th substance). For our purposes it is more convenient to consider~ a potential differing from chemical ' ones by the RT factor rather than chemical potentials themselves: The former were designated /1/ as pseudochemical potentials.
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A new moment-based theoretical approach for the
analysis of TAP (temporal analysis of products)
pulse-response data is described. The distinguishing feature of
this approach is that the variables
of the set of ordinary differential equations that comprise the model
are moments instead of
concentrations. The moments are functions of the reactor axial
coordinate, whereas concentrations are functions of space and time. The theoretical framework
for the extraction of kinetic
parameters using this approach is developed, and is used to determine
kinetic parameters for
CO oxidation over platinum powder. A new phenomenon, called “TAP
equilibrium” is described.
This phenomenon is governed by the interplay between reaction and
Knudsen diffusion.
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