TY - JOUR
T1 - X-ray excited optical fluorescence and diffraction imaging of reactivity and crystallinity in a zeolite crystal : crystallography and molecular spectroscopy in one
AU - Ristanovic, Z.
AU - Hofmann, J.P.
AU - Richard, M.-I.
AU - Jiang, T.
AU - Chahine, G.A.
AU - Schülli, T.U.
AU - Meirer, F.
AU - Weckhuysen, B.M.
PY - 2016
Y1 - 2016
N2 - 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 μm-resolved X-ray diffraction (μ-XRD) and X-ray excited optical fluorescence (μ-XEOF) maps of the crystallinity and Brønsted reactivity of a zeolite crystal previously reacted with a styrene probe molecule. The local gradients in chemical reactivity (derived from μ-XEOF) were correlated with local crystallinity and framework Al content, determined by μ-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.
AB - 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 μm-resolved X-ray diffraction (μ-XRD) and X-ray excited optical fluorescence (μ-XEOF) maps of the crystallinity and Brønsted reactivity of a zeolite crystal previously reacted with a styrene probe molecule. The local gradients in chemical reactivity (derived from μ-XEOF) were correlated with local crystallinity and framework Al content, determined by μ-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.
U2 - 10.1002/anie.201601796
DO - 10.1002/anie.201601796
M3 - Article
C2 - 27145171
SN - 0570-0833
VL - 55
SP - 7496
EP - 7500
JO - Angewandte Chemie - International Edition
JF - Angewandte Chemie - International Edition
IS - 26
ER -