In:
Journal of Synchrotron Radiation, International Union of Crystallography (IUCr), Vol. 25, No. 4 ( 2018-07-01), p. 989-997
Abstract:
A setup for fluorescence-detected X-ray absorption spectroscopy (XAS) with sub-second time resolution has been developed. This technique allows chemical speciation of low-concentrated materials embedded in highly absorbing matrices, which cannot be studied using transmission XAS. Using this setup, the reactivity of 1.5 wt% Pt/CeO 2 catalyst was studied with 100 ms resolution during periodic cycling in CO- and oxygen-containing atmospheres in a plug-flow reactor. Measurements were performed at the Pt L 3 - and Ce L 3 -edges. The reactivity of platinum and cerium demonstrated a strong correlation. The oxidation of the catalyst starts on the ceria support helping the oxidation of platinum nanoparticles. The new time-resolved XAS setup can be applied to various systems, capable of reproducible cycling between different states triggered by gas atmosphere, light, temperature, etc . It opens up new perspectives for mechanistic studies on automotive catalysts, selective oxidation catalysts and photocatalysts.
Type of Medium:
Online Resource
ISSN:
1600-5775
DOI:
10.1107/S1600577518005325
DOI:
10.1107/S1600577518005325/xj5013sup1.pdf
Language:
Unknown
Publisher:
International Union of Crystallography (IUCr)
Publication Date:
2018
detail.hit.zdb_id:
2021413-3
Bookmarklink