dc.contributor.author
Wild, Stefan
dc.contributor.author
Mahr, Christoph
dc.contributor.author
Rosenauer, Andreas
dc.contributor.author
Risse, Thomas
dc.contributor.author
Vasenkov, Sergey
dc.contributor.author
Bäumer, Marcus
dc.date.accessioned
2023-10-09T06:20:14Z
dc.date.available
2023-10-09T06:20:14Z
dc.identifier.uri
https://refubium.fu-berlin.de/handle/fub188/38275
dc.identifier.uri
http://dx.doi.org/10.17169/refubium-37994
dc.description.abstract
In this article we shed light on newly emerging perspectives to characterize and understand the interplay of diffusive mass transport and surface catalytic processes in pores of gas phase metal catalysts. As a case study, nanoporous gold, as an interesting example exhibiting a well-defined pore structure and a high activity for total and partial oxidation reactions is considered. PFG NMR (pulsed field gradient nuclear magnetic resonance) measurements allowed here for a quantitative evaluation of gas diffusivities within the material. STEM (scanning transmission electron microscopy) tomography furthermore provided additional insight into the structural details of the pore system, helping to judge which of its features are most decisive for slowing down mass transport. Based on the quantitative knowledge about the diffusion coefficients inside a porous catalyst, it becomes possible to disentangle mass transport contributions form the measured reaction kinetics and to determine the kinetic rate constant of the underlying catalytic surface reaction. In addition, predictions can be made for an improved effectiveness of the catalyst, i.e., optimized conversion rates. This approach will be discussed at the example of low-temperature CO oxidation, efficiently catalysed by npAu at 30 °C. The case study shall reveal that novel porous materials exhibiting well-defined micro- and mesoscopic features and sufficient catalytic activity, in combination with modern techniques to evaluate diffusive transport, offer interesting new opportunities for an integral understanding of catalytic processes.
en
dc.format.extent
18 Seiten
dc.rights.uri
https://creativecommons.org/licenses/by/4.0/
dc.subject
Porous heterogeneous catalysts
en
dc.subject
Tortuosity factor
en
dc.subject
Diffusive mass transport
en
dc.subject
Catalyst effectiveness factors
en
dc.subject
Pulsed field gradient NMR
en
dc.subject
TEM tomography
en
dc.subject
Nanoporous gold
en
dc.subject.ddc
500 Naturwissenschaften und Mathematik::540 Chemie::540 Chemie und zugeordnete Wissenschaften
dc.title
New Perspectives for Evaluating the Mass Transport in Porous Catalysts and Unfolding Macro- and Microkinetics
dc.type
Wissenschaftlicher Artikel
dcterms.bibliographicCitation.doi
10.1007/s10562-022-04218-6
dcterms.bibliographicCitation.journaltitle
Catalysis Letters
dcterms.bibliographicCitation.number
11
dcterms.bibliographicCitation.pagestart
3405
dcterms.bibliographicCitation.pageend
3422
dcterms.bibliographicCitation.volume
153
dcterms.bibliographicCitation.url
https://doi.org/10.1007/s10562-022-04218-6
refubium.affiliation
Biologie, Chemie, Pharmazie
refubium.affiliation.other
Institut für Chemie und Biochemie

refubium.resourceType.isindependentpub
no
dcterms.accessRights.openaire
open access
dcterms.isPartOf.eissn
1572-879X
refubium.resourceType.provider
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