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Oscillations in pores of a catalyst particle in exothermic liquid (liquid–gas) reactions : Analysis of heat processes and their influence on chemical conversion, mass and heat transfer

Title data

Datsevich, Leonid:
Oscillations in pores of a catalyst particle in exothermic liquid (liquid–gas) reactions : Analysis of heat processes and their influence on chemical conversion, mass and heat transfer.
In: Applied Catalysis A: General. Vol. 250 (2003) Issue 1 . - pp. 125-141.
ISSN 0926-860X
DOI: https://doi.org/10.1016/S0926-860X(03)00294-1

Official URL: Volltext

Abstract in another language

A theoretical analysis of thermal processes in liquid–gas exothermic reactions in a porous catalyst shows the existence of the alternating motion of liquid in the pore. According to this model, if the released heat in the pore exceeds a certain critical value, the alternating motion of the liquid driven by the formation of the bubble takes place in the pore. Specifically, because of the heating of the liquid in the pore, the partial pressure of vapor saturated in liquid increases until the total pressure of the saturated gas and vapor becomes greater than the maximum possible pressure in the pore (equal to the sum of capillary pressure and pressure in the reactor) and the bubble thereby comes into being. The growing bubble pushes the liquid out of the pore. Since the reagent(s) is no longer in the pore, the reaction ceases and the generated heat dissipates. The liquid penetrates into the pore due to capillary force and the process of bubble formation occurs once again. A detailed analysis of this non-stability is undertaken. This paper seeks to show how this theory can explain some dependencies of the reaction rate observed in practice, mass and heat transfer in the fixed and suspended catalyst as well as some practical recommendations for catalyst development and process intensification. Analogy between oscillation behaviour and the boiling process is considered.

Further data

Item Type: Article in a journal
Refereed: Yes
Keywords: Multiphase exothermic reactions; Oscillation model; Catalysis; Mass and heat transfer; Kinetics; Effective diffusion
Institutions of the University: Faculties > Faculty of Engineering Science
Faculties > Faculty of Engineering Science > Chair Chemical Engineering
Faculties > Faculty of Engineering Science > Chair Chemical Engineering > Chair Chemical Engineering - Univ.-Prof. Dr.-Ing. Andreas Jess
Faculties
Result of work at the UBT: Yes
DDC Subjects: 500 Science > 540 Chemistry
600 Technology, medicine, applied sciences > 600 Technology
600 Technology, medicine, applied sciences > 620 Engineering
600 Technology, medicine, applied sciences > 660 Chemical engineering
Date Deposited: 24 Apr 2015 08:11
Last Modified: 11 Jun 2015 12:22
URI: https://eref.uni-bayreuth.de/id/eprint/10545