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Issue 1, 2015
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Chemical imaging of single catalyst particles with scanning μ-XANES-CT and μ-XRF-CT

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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.

Graphical abstract: Chemical imaging of single catalyst particles with scanning μ-XANES-CT and μ-XRF-CT

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Publication details

The article was received on 04 Oct 2014, accepted on 29 Oct 2014, published on 05 Nov 2014 and first published online on 05 Nov 2014


Article type: Paper
DOI: 10.1039/C4CP04488F
Citation: Phys. Chem. Chem. Phys., 2015,17, 521-529
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    Chemical imaging of single catalyst particles with scanning μ-XANES-CT and μ-XRF-CT

    S. W. T. Price, K. Ignatyev, K. Geraki, M. Basham, J. Filik, N. T. Vo, P. T. Witte, A. M. Beale and J. F. W. Mosselmans, Phys. Chem. Chem. Phys., 2015, 17, 521
    DOI: 10.1039/C4CP04488F

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