Probing local diffusion and reaction in a porous catalyst pellet

2020 ◽  
Vol 381 ◽  
pp. 285-294 ◽  
Author(s):  
Bahne Sosna ◽  
Oliver Korup ◽  
Raimund Horn
Keyword(s):  
Porous Catalyst ◽  
Catalyst Pellet ◽  
Local Diffusion

Modeling of the Unsteady State Methanol Synthesis at the Level of Catalyst Pellet

2017 ◽  
Vol 68 (6) ◽  
pp. 1153-1158
Author(s):  
Ionut Banu ◽  
Ioana Stoica ◽  
Gheorghe Bumbac ◽  
Grigore Bozga
Keyword(s):  
Methanol Synthesis ◽  
Fixed Bed ◽  
Reaction Diffusion ◽  
Fluid Phase ◽  
Industrial Applications ◽  
Operating Conditions ◽  
Temperature Fields ◽  
Unsteady State ◽  
Porous Catalyst ◽  
Catalyst Pellet

In a fixed bed of porous catalyst pellets, there are developed two composition and temperature fields, one in the fluid phase and the other one at the level of solid pellets. The objective of this work is to evaluate, by numerical simulation, the unsteady state behavior of a catalyst pellet in typical operating conditions for methanol synthesis reactors. The process kinetics was described by the model published by Graaf et al (1990) and the reaction-diffusion process inside the pellet is based on the Wilke-Bosanquet model. The results showed a short composition and temperature stabilization time, generally below 4 seconds, for a spherical catalyst pellet having typical dimensions for industrial applications.

Generation of oscillatory solutions in a porous catalyst pellet

1997 ◽  
Vol 52 (11) ◽  
pp. 1767-1776 ◽  
Author(s):  
Andrzej Burghardt ◽  
Marek Berezowski
Keyword(s):  
Oscillatory Solutions ◽  
Porous Catalyst ◽  
Catalyst Pellet

scholarly journals Adsorption with chemical reaction in porous catalyst pellets under alternate concentration fields. Uniform temperature case

2016 ◽  
Vol 37 (4) ◽  
pp. 473-484
Author(s):  
Katarzyna Bizon ◽  
Bolesław Tabiś
Keyword(s):  
Chemical Reaction ◽  
Reaction Diffusion ◽  
Freundlich Isotherm ◽  
Entire Volume ◽  
Porous Catalyst ◽  
Linear Isotherm ◽  
Catalyst Pellet ◽  
Catalyst Pellets ◽  
The Impact ◽  
Sorption Phenomenon

Abstract The work concerns the dynamic behaviour of a porous, isothermal catalyst pellet in which a simultaneous chemical reaction, diffusion and adsorption take place. The impact of the reactant adsorption onto the pellet dynamics was evaluated. A linear isotherm and a non-linear Freundlich isotherm were considered. Responses of the pellet to sinusoidal variations of the reactant concentration in a bulk gas were examined. It was demonstrated that the dynamics of the pellet is significantly affected both by accounting for the adsorption and by the frequency of the bulk concentration variations. The sorption phenomenon causes damping of the concentration oscillations inside the pellet and damping of its effectiveness factor oscillations. Depending on the frequency of the concentration oscillations in the bulk, the remarkable oscillations can involve an entire volume of the pellet or its portion in the vicinity of the external surface.

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