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Chemical imaging of single catalyst particles with scanning μ-XANES-CT and μ-XRF-CT
DOI:
10.1039/C4CP04488F
PMID:
25407850
Authors:
Stephen
Price
(Diamond Light Source)
,
Konstantin
Ignatyev
(Diamond Light Source)
,
Tina
Geraki
(Diamond Light Source)
,
Mark
Basham
(Diamond Light Source)
,
Jacob
Filik
(Diamond Light Source)
,
Nghia T.
Vo
(Diamond Light Source)
,
Peter
Witte
(BASF Nederland B.V.)
,
Andrew
Beale
(University College London)
,
Fred
Mosselmans
(Diamond Light Source)
Co-authored by industrial partner:
Yes
Type:
Journal Paper
Journal:
Physical Chemistry Chemical Physics
State:
Published (Approved)
Published:
November 2014
Diamond Proposal Number(s):
4939

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.
Subject Areas:
Chemistry,
Materials,
Technique Development
Instruments:
B18-Core EXAFS
,
I18-Microfocus Spectroscopy
Discipline Tags:
Technical Tags: