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In Situ Microfocus Chemical Computed Tomography of the Composition of a Single Catalyst Particle During Hydrogenation of Nitrobenzene in the Liquid Phase

DOI: 10.1002/ange.201504227 DOI Help

Authors: Stephen Price (Diamond Light Source) , Tina Geraki (Diamond Light Source) , Konstantin Ignatyev (Diamond Light Source) , Peter T. Witte (Catalysis Research GCC/PB) , Andrew M. Beale (Research Complex at Harwell) , Fred Mosselmans (Diamond Light Source)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Angewandte Chemie , VOL 127 , PAGES 10024 - 10027

State: Published (Approved)
Published: August 2015
Diamond Proposal Number(s): 11043

Abstract: Heterogeneous catalysis performed in the liquidphase is an important type of catalytic process whichisrarelystudied in situ. Using microfocus X-ray fluorescence and X-raydiffraction computed tomography (m-XRF-CT, m-XRD-CT) incombination with X-ray absorption near-edge spectroscopy(XANES), we have determined the active state of aMo-promoted Pt/C catalyst (NanoSelect) for the liquid-phasehydrogenation of nitrobenzene under standardoperatingconditions.First, m-XRF-CT and m-XRD-CT reveal the activestate of Pt catalyst to be reduced, noncrystalline,and evenlydispersed across the support surface.Second, imaging of the Ptand Mo distribution reveals they are highly stable on thesupport and not prone to leaching during the reaction. Thisstudy demonstrates the ability of chemical computed tomog-raphy to image the nature and spatial distribution of catalystsunder reaction conditions.

Journal Keywords: computed tomography ·heterogeneous catalysis ·liquid phase ·supported catalysts ·X-ray microspectroscopy

Subject Areas: Chemistry

Instruments: I18-Microfocus Spectroscopy