uu.seUppsala University Publications
Change search
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf
Transient structural and catalytic behaviour of Pt-particles probed by operando spectroscopy during a realistic driving cycle
Karlsruhe Inst Technol, Inst Chem Technol & Polymer Chem, Engesserstr 20, D-76131 Karlsruhe, Germany.ORCID iD: 0000-0002-3722-795X
Karlsruhe Inst Technol, Inst Chem Technol & Polymer Chem, Engesserstr 20, D-76131 Karlsruhe, Germany;Karlsruhe Inst Technol, Inst Catalysis Res & Technol, Hermann von Helmholtz Pl 1, D-76344 Eggenstein Leopoldshafen, Germany.ORCID iD: 0000-0002-8891-985X
European Synchrotron Radiat Facil, 71 Ave Martyrs, F-38000 Grenoble, France;Karlsruhe Inst Technol, Inst Chem Technol & Polymer Chem, Engesserstr 20, D-76131 Karlsruhe, Germany;Karlsruhe Inst Technol, Inst Catalysis Res & Technol, Hermann von Helmholtz Pl 1, D-76344 Eggenstein Leopoldshafen, Germany.
Show others and affiliations
2017 (English)In: Catalysis Science & Technology, ISSN 2044-4753, E-ISSN 2044-4761, Vol. 7, no 18, p. 3999-4006Article in journal (Refereed) Published
Abstract [en]

Pt-based diesel oxidation catalysts were investigated for CO oxidation activity under rapid transient temperature conditions based on a realistic driving cycle, which is presently a focal point in exhaust gas aftertreatment. Experiments were performed in a microreactor setup allowing rapid heating/cooling coupled with operando Turbo X-ray absorption spectroscopy (T-XAS) and on-line product analysis by mass spectrometry. Significant differences were observed in catalyst structure and performance depending on the temperature ramp rate. Particularly for Pt/Al2O3, the Pt oxidation state followed a dynamic hysteresis profile during CO oxidation light-off and light-out. In contrast, in Pt-CeO2/Al2O3, ceria acted as an oxygen storage buffer, reducing the width of the Pt oxidation/reduction hysteresis loop as a function of the temperature ramp rate. Ceria also supplied oxygen to the Pt surface, helping to maintain high activity during cooling down and at lower temperatures during transient conditions. This study shows the potential insights into the reaction mechanism available when considering transient temperature as an experimental condition during operando spectroscopic studies in exhaust gas catalysis. The current method is applicable to virtually any rapid transient temperature driving cycle.

Place, publisher, year, edition, pages
2017. Vol. 7, no 18, p. 3999-4006
National Category
Physical Chemistry
Identifiers
URN: urn:nbn:se:uu:diva-359798DOI: 10.1039/c7cy00926gISI: 000411012900005OAI: oai:DiVA.org:uu-359798DiVA, id: diva2:1250422
Available from: 2018-09-24 Created: 2018-09-24 Last updated: 2018-09-24Bibliographically approved

Open Access in DiVA

No full text in DiVA

Other links

Publisher's full text

Authority records BETA

Benzi, Federico

Search in DiVA

By author/editor
Benzi, FedericoSheppard, Thomas L.Baier, SinaGrunwaldt, Jan-Dierk
In the same journal
Catalysis Science & Technology
Physical Chemistry

Search outside of DiVA

GoogleGoogle Scholar

doi
urn-nbn

Altmetric score

doi
urn-nbn
Total: 1 hits
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf