Structural Complexity in Heterogeneous Catalysis: Cataloging Local Nanostructures

Liudmyla Masliuk, Marc Heggen, Johannes Noack, Frank Girgsdies, Annette Trunschke, Klaus E. Hermann, Marc Georg Willinger, Robert Schlögl, Thomas Lunkenbein

Research output: Contribution to journalArticlepeer-review

17 Scopus citations

Abstract

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.

Original languageEnglish
Pages (from-to)24093-24103
Number of pages11
JournalJournal of Physical Chemistry C
Volume121
Issue number43
DOIs
StatePublished - 2 Nov 2017
Externally publishedYes

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