Structural Complexity in Heterogeneous Catalysis:
Cataloging Local Nanostructures
Version 2 2017-12-14, 18:22
Version 1 2017-10-23, 19:49
Posted on 2017-12-14 - 18:22
We
present an analytical route toward a detailed and quantitative
description of individual defects in heterogeneous catalysts. The
investigation is based on a high resolution scanning transmission
electron microscopy (STEM) study using complex (Mo,V)Ox mixed oxide as an example. Tiling the structural
regions simplifies the identification of local modifications in the
microstructure. Up to 19 different structures were observed that can
be listed and classified into different structural motifs, intergrowth,
channels, interstitial regions, and inclinations. The observed defects
are expressed by the rearrangement of the {(Mo)Mo5O27} building blocks, exhibit different sizes, penetrate the
bulk, and can form decoupled surface regions that partially cover
the crystallographic bulk. The evaluation of 31 crystals yields an
average defect concentration of 3.3% and indicates the absence of
identical particles. We have, for example, observed 54 of these rearranged
structures close to the surface of one (Mo,V)Ox particle (100 × 50 nm2). A detailed analysis
of the atomic arrangement at the surface of this particle suggests
a surface composition of (Mo610V230M70)Ox (M = Mo and/or V). The resulting
catalog of motifs reproduces individual fragments of the real structure
of a catalyst and can reveal detailed defect–activity correlations
that will contribute to a better understanding of heterogeneous catalysis.
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Masliuk, Liudmyla; Heggen, Marc; Noack, Johannes; Girgsdies, Frank; Trunschke, Annette; Hermann, Klaus E.; et al. (2017). Structural Complexity in Heterogeneous Catalysis:
Cataloging Local Nanostructures. ACS Publications. Collection. https://doi.org/10.1021/acs.jpcc.7b08333
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AUTHORS (9)
LM
Liudmyla Masliuk
MH
Marc Heggen
JN
Johannes Noack
FG
Frank Girgsdies
AT
Annette Trunschke
KH
Klaus E. Hermann
MW
Marc Georg Willinger
RS
Robert Schlögl
TL
Thomas Lunkenbein