Probing local diffusion and reaction in a porous catalyst pellet

Publikationstyp
Journal Article
Publikationsdatum
2020-01
Author
Sosna, Bahne orcid-logo
Korup, Oliver 
Horn, Raimund 
Institut
Chemische Reaktionstechnik V-2 
TORE-URI
http://hdl.handle.net/11420/3927
Enthalten in
Journal of catalysis 
Volume
381
Start Page
285
End Page
294
Citation
Journal of Catalysis (381): 285-294 (2020-01)
Publisher DOI
10.1016/j.jcat.2019.11.005
Scopus ID
2-s2.0-85075536988
In the present work, we report on the direct measurement of spatially resolved concentration profiles inside a single catalyst pellet under reaction conditions using a capillary sampling method. CO oxidation on a platinum-coated, porous alumina cylinder was chosen as test reaction system. CFD simulations were conducted to probe the invasiveness of the method, which turned out to be acceptable for practical application. Spatially resolved CO2 mole fraction profiles inside the particle are presented for different reaction conditions. Phenomena that result from the interplay between diffusion and reaction such as boundary layers, bifurcation, multiple steady states and kinetic oscillations are also shown. The method might allow the knowledge-based optimization of many industrial fixed-bed processes without requiring major changes to the process layout.
Schlagworte
CO oxidation
Diffusion
Heterogeneous catalysis
Porous catalyst pellet
Reaction
Spatial profiles