Title

Correlating Catalytic Methanol Oxidation With The Structure And Oxidation State Of Size-Selected Pt Nanoparticles

Keywords

alumina; EXAFS; methanol oxidation; nanoparticle; operando; platinum; size-selected; XAFS; XANES

Abstract

We have investigated the structure and chemical state of size-selected platinum nanoparticles (NPs) prepared by micelle encapsulation and supported on γ-Al2O3 during the oxidation of methanol under oxygen-rich reaction conditions following both oxidative and reductive pretreatments. X-ray absorption near-edge structure (XANES) and extended X-ray absorption fine-structure (EXAFS) spectroscopy measurements reveal that in both cases, the catalyst is substantially oxidized under reaction conditions at room temperature and becomes partially reduced when the reactor temperature is raised to 50 C. Reactivity tests show that at low temperatures, the preoxidized catalyst, in which a larger degree of oxidation was observed, is more active than the prereduced catalyst. We conclude that the differences in reactivity can be linked to the formation and stabilization of distinct active oxide species during the pretreatment. © 2013 American Chemical Society.

Publication Date

7-5-2013

Publication Title

ACS Catalysis

Volume

3

Issue

7

Number of Pages

1460-1468

Document Type

Article

Personal Identifier

scopus

DOI Link

https://doi.org/10.1021/cs400234h

Socpus ID

84879923648 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/84879923648

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