Journal Article

FZJ-2018-00787

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Structural Complexity in Heterogeneous Catalysis: Cataloging Local Nanostructures

Masliuk, L. ; Heggen, M.FZJ* ; Noack, J. ; Girgsdies, F. ; Trunschke, A. ; Hermann, K. E. ; Willinger, M. G. ; Schlögl, R. ; Lunkenbein, T. (Corresponding author)

2017
Soc. Washington, DC

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Please use a persistent id in citations: http://hdl.handle.net/2128/16703  doi:10.1021/acs.jpcc.7b08333

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.

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Contributing Institute(s):

1. Physik Nanoskaliger Systeme (ER-C-1)

Research Program(s):

1. 143 - Controlling Configuration-Based Phenomena (POF3-143) (POF3-143)

Appears in the scientific report 2017

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Database coverage:
; ; Current Contents - Physical, Chemical and Earth Sciences ; Free to read ; IF < 5 ; JCR ; SCOPUS ; Science Citation Index ; Science Citation Index Expanded ; Thomson Reuters Master Journal List ; Web of Science Core Collection

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