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  4. Delayed binary and multicomponent gas diffusion in conical tubes
 
Zitierlink DOI
10.26092/elib/2447
Verlagslink DOI
10.1016/j.ces.2016.03.029

Delayed binary and multicomponent gas diffusion in conical tubes

Veröffentlichungsdatum
2016-04-29
Autoren
Veltzke, Thomas  
Pille, Fabian  
Thöming, Jorg  
Zusammenfassung
Catalyst pores are typically non-uniform along their longitudinal axis, and the transport of gaseous reactants and products takes place in a somehow tapered confinement. In a previous study we observed a diffusion delay in single tapered pores by means of a transient two-bulb-diffusion-cell (Veltzke et al., 2015). Processes in heterogeneous catalysis, however, are typically operated under steady state conditions. Hence also the diffusion processes are non-transient and reactant species are permanently consumed while product species steadily emerge. To mimic steady-state multicomponent diffusion in a cone, we developed a novel two-pipe-diffusion-cell and described the mass transport by an analytical model.

Here we can show that the delay effect, which is caused by volumetric changes in longitudinal direction, also exists for steady-state binary and multicomponent diffusion. It is experimentally confirmed that the diffusion hindrance increases with conicity of the test tube. Also the results are transferable to those of the transient two-bulb-diffusion-cell. The measurement of steady-state experiments, however, is much faster.
Schlagwörter
Transport limitation in catalysis

; 

Steady-state multicomponent diffusion

; 

Novel diffusion experiment

; 

Conical test tube

; 

Transport delay

; 

Mimenima
Verlag
Elsevier
Institution
Universität Bremen  
Fachbereich
Zentrale Wissenschaftliche Einrichtungen und Kooperationen  
Institute
Zentrum für Umweltforschung und nachhaltige Technologien (UFT)  
Dokumenttyp
Artikel/Aufsatz
Zeitschrift/Sammelwerk
Chemical Engineering Science  
Band
148
Startseite
93
Endseite
107
Zweitveröffentlichung
Ja
Dokumentversion
Postprint
Lizenz
https://creativecommons.org/licenses/by-nc-nd/4.0/
Sprache
Englisch
Dateien
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Vorschaubild
Name

T. Veltzke, J. Thöming, Delayed binary and multicomponent gas diffusion in conical tubes_2016_accepted version_Deckblatt_pdfa1.pdf

Size

704.16 KB

Format

Adobe PDF

Checksum

(MD5):e549393bcf249b0a67ff320fdc28987d

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