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Quantitative Analysis of HAADF–STEM Images of MoVTeTaO M1 Phase Catalyst for Propane Ammoxidation to Acrylonitrile

Journal Article · · ChemCatChem
 [1];  [2];  [3];  [1]
  1. Department of Biomedical, Chemical, and Environmental Engineering University of Cincinnati Cincinnati OH 45221‐0012 USA
  2. Center for Nanophase Materials Sciences Oak Ridge National Laboratory Oak Ridge TN 37831 USA
  3. Institute for Experimental Physics Ulm University Albert-Einstein-Allee 11 89081 Ulm Germany

Abstract

High‐angle annular dark‐field scanning transmission electron microscopy (HAADF–STEM) image simulations were performed to determine accurate metal distributions in the MoVTeTaO M1 phase catalyst for propane ammoxidation. QSTEM simulation, based on a multislice method with the frozen phonon approximation, was chosen because of the excellent agreement between experimental and simulated HAADF–STEM images. This simulation method successfully provided accurate metal distributions in the MoVTeTaO M1 phase and indicated significantly lower V occupancies of the linking sites 1, 2, 3, 4, and 7, and higher Ta occupancy in site 9 than the previously reported metal occupancies. This novel methodology for accurate HAADF–STEM image analysis is a valuable tool for accurate analysis of local chemical compositions in a wide range of ordered catalytic materials.

Sponsoring Organization:
USDOE
Grant/Contract Number:
FG02-04ER15604
OSTI ID:
1786155
Journal Information:
ChemCatChem, Journal Name: ChemCatChem Journal Issue: 22 Vol. 7; ISSN 1867-3880
Publisher:
Wiley Blackwell (John Wiley & Sons)Copyright Statement
Country of Publication:
Germany
Language:
English

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