Journal Article

PUBDB-2021-01607

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Tracking Dynamic Structural Changes in Catalysis by Rapid 2D-XANES Microscopy

Alizadehfanaloo, S. (Corresponding author)DESY* ; Garrevoet, J.DESY* ; Seyrich, M.Extern*XFEL.EU*DESY* ; Murzin, V.Extern*XFEL.EU* ; Becher, J.Extern* ; Doronkin, D.Extern* ; Sheppard, T.Extern* ; Grunwaldt, J.-D.Extern* ; Schroer, C.DESY* ; Schropp, A. (Corresponding author)DESY*

2021
Wiley-Blackwell [S.l.]

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Please use a persistent id in citations: doi:10.1107/S1600577521007074  doi:10.3204/PUBDB-2021-01607

Abstract: Many processes and materials in heterogeneous catalysis undergo dynamic structural changes depending on their chemical environment. Monitoring such dynamic changes can be challenging using conventional spectroscopic characterization tools, due to the high time resolution required. Here, a high-resolution 2D X-ray camera operating at 50 Hz full-frame rate was synchronized with a QEXAFS monochromator, enabling rapid spectro-microscopic imaging with chemical contrast over individual pixels. This was used to monitor chemical gradients within a model Pt/Al2O3 catalyst during catalytic partial oxidation of methane to synthesis gas. The transition from methane combustion (partly oxidized Pt) to combustion-reforming and partial oxidation (fully reduced Pt) was observed by a characteristic reduction front, which progressed from the end of the catalyst bed towards its beginning on the second time scale. The full-field QEXAFS imaging method applied here allows acquisition of entire XANES spectra `on the fly' in a rapid and spatially resolved manner. The combination of high spatial and temporal resolution with spectroscopic data offers new opportunities for observing dynamic processes in catalysts and other functional materials at work. The methodology is flexible and can be applied at beamlines equipped with a QEXAFS or other fast-scanning monochromators and a suitable sample environment for gas phase analytics to allow for catalytic studies at the same time.

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Contributing Institute(s):

1. FS-PETRA (FS-PETRA)
2. Experimentebetreuung PETRA III (FS-PET-S)

Research Program(s):

1. 631 - Matter – Dynamics, Mechanisms and Control (POF4-631) (POF4-631)
2. 6G3 - PETRA III (DESY) (POF4-6G3) (POF4-6G3)
3. DFG project 426888090 - SFB 1441: Verfolgung der aktiven Zentren in heterogenen Katalysatoren für die Emissionskontrolle (TrackAct) (426888090) (426888090)

Experiment(s):

1. PETRA Beamline P64 (PETRA III)

Appears in the scientific report 2021

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Database coverage:
; ; ; Clarivate Analytics Master Journal List ; Current Contents - Physical, Chemical and Earth Sciences ; DEAL Wiley ; Ebsco Academic Search ; Essential Science Indicators ; IF < 5 ; JCR ; Nationallizenz ; PubMed Central ; SCOPUS ; Science Citation Index Expanded ; Web of Science Core Collection

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