X-ray Excited Optical Fluorescence and Diffraction Imaging of Reactivity and Crystallinity in a Zeolite Crystal: Crystallography and Molecular Spectroscopy in One - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Angewandte Chemie International Edition Année : 2016

X-ray Excited Optical Fluorescence and Diffraction Imaging of Reactivity and Crystallinity in a Zeolite Crystal: Crystallography and Molecular Spectroscopy in One

Zoran Ristanovic
  • Fonction : Auteur
Jan P. Hofmann
  • Fonction : Auteur
Tao Jiang
Gilbert A. Chahine
  • Fonction : Auteur
Tobias U. Schulli
  • Fonction : Auteur
Florian Meirer
  • Fonction : Auteur
Bert M. Weckhuysen
  • Fonction : Auteur

Résumé

Structure-activity relationships in heterogeneous catalysis are challenging to be measured on a single-particle level. For the first time, one X-ray beam is used to determine the crystallographic structure and reactivity of a single zeolite crystal. The method generates mm-resolved X-ray diffraction (m-XRD) and X-ray excited optical fluorescence (m-XEOF) maps of the crystallinity and Bronsted reactivity of a zeolite crystal previously reacted with a styrene probe molecule. The local gradients in chemical reactivity (derived from m-XEOF) were correlated with local crystallinity and framework Al content, determined by m-XRD. Two distinctly different types of fluorescent species formed selectively, depending on the local zeolite crystallinity. The results illustrate the potential of this approach to resolve the crystallographic structure of a porous material and its reactivity in one experiment via X-ray induced fluorescence of organic molecules formed at the reactive centers.

Dates et versions

hal-01435220 , version 1 (13-01-2017)

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Citer

Zoran Ristanovic, Jan P. Hofmann, Marie-Ingrid Richard, Tao Jiang, Gilbert A. Chahine, et al.. X-ray Excited Optical Fluorescence and Diffraction Imaging of Reactivity and Crystallinity in a Zeolite Crystal: Crystallography and Molecular Spectroscopy in One. Angewandte Chemie International Edition, 2016, 55 (26), pp.7496-7500. ⟨10.1002/anie.201601796⟩. ⟨hal-01435220⟩
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