Role and Evolution of Nanoparticle Structure and Chemical State during the 
Oxidation of NO over Size- and Shape-Controlled Pt/γ-Al2O3 Catalysts under 
Operando Conditions

Lira, E.; Merte, L. R.; Behafarid, F.; Ono, L. K.; Zhang, L.; Roldan Cuenya, Beatriz

doi:/10.1021/cs500137r

Item

ITEM ACTIONSEXPORT

Add to Basket

Local TagsRelease HistoryDetailsSummary

Released

Journal Article

Role and Evolution of Nanoparticle Structure and Chemical State during the Oxidation of NO over Size- and Shape-Controlled Pt/γ-Al₂O₃ Catalysts under Operando Conditions

MPS-Authors

There are no MPG-Authors in the publication available

External Resource

No external resources are shared

Fulltext (restricted access)

There are currently no full texts shared for your IP range.

Fulltext (public)

There are no public fulltexts stored in PuRe

Supplementary Material (public)

There is no public supplementary material available

Citation

Lira, E., Merte, L. R., Behafarid, F., Ono, L. K., Zhang, L., & Roldan Cuenya, B. (2014). Role and Evolution of Nanoparticle Structure and Chemical State during the Oxidation of NO over Size- and Shape-Controlled Pt/γ-Al₂O₃ Catalysts under Operando Conditions. ACS Catalysis, 4(6), 1875-1884. doi:/10.1021/cs500137r.

Cite as: https://hdl.handle.net/21.11116/0000-0006-C282-B

Abstract

The structure and chemical state of size-selected Pt nanoparticles (NPs) supported on γ-Al₂O₃ were studied during the oxidation of NO using X-ray absorption near-edge spectroscopy and extended X-ray absorption fine-structure spectroscopy measurements under operando conditions. The data revealed the formation of PtO_x species in the course of the reaction that remained present at the maximum temperature studied, 350 °C. The PtO_x species were found in all samples, but those with the smallest NPs showed the highest degree of oxidation. Moreover, NO-induced nanoparticle redispersion was observed at temperatures below 150 °C for all catalysts studied. Catalytic tests showed activity toward the oxidation of NO for all samples. Nevertheless, the catalyst with the smallest NPs was found to be the least active, which is explained by a more extensive formation of PtO_x species in this catalyst and their detrimental contribution to the oxidation of NO.