Price, SW;
Ignatyev, K;
Geraki, K;
Basham, M;
Filik, J;
Vo, NT;
Witte, PT;
... Mosselmans, JF; + view all
(2015)
Chemical imaging of single catalyst particles with scanning μ-XANES-CT and μ-XRF-CT.
Physical Chemistry Chemical Physics
, 17
(1)
pp. 521-529.
10.1039/c4cp04488f.
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Abstract
The physicochemical state of a catalyst is a key factor in determining both activity and selectivity; however these materials are often not structurally or compositionally homogeneous. Here we report on the 3-dimensional imaging of an industrial catalyst, Mo-promoted colloidal Pt supported on carbon. The distribution of both the active Pt species and Mo promoter have been mapped over a single particle of catalyst using microfocus X-ray fluorescence computed tomography. X-ray absorption near edge spectroscopy (XANES) and extended X-ray absorption fine structure revealed a mixed local coordination environment, including the presence of both metallic Pt clusters and Pt chloride species, but also no direct interaction between the catalyst and Mo promoter. We also report on the benefits of scanning μ-XANES computed tomography for chemical imaging, allowing for 2- and 3-dimensional mapping of the local electronic and geometric environment, in this instance for both the Pt catalyst and Mo promoter throughout the catalyst particle.
| Type: | Article |
|---|---|
| Title: | Chemical imaging of single catalyst particles with scanning μ-XANES-CT and μ-XRF-CT |
| Location: | England |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1039/c4cp04488f |
| Publisher version: | http://dx.doi.org/10.1039/c4cp04488f |
| Language: | English |
| Additional information: | This journal is © the Owner Societies 2015. |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Chemistry |
| URI: | https://discovery.ucl.ac.uk/id/eprint/1473188 |
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