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  Influence of the Microstructure of Gold-Zirconia Yolk-Shell Catalysts on the CO Oxidation Activity

Dangwal Pandey, A., Güttel, R., Leoni, M., Schüth, F., & Weidenthaler, C. (2010). Influence of the Microstructure of Gold-Zirconia Yolk-Shell Catalysts on the CO Oxidation Activity. The Journal of Physical Chemistry C, 114(45), 19386-19394. doi:10.1021/jp106436h.

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 Creators:
Dangwal Pandey, Arti1, Author              
Güttel, Robert1, Author              
Leoni, Matteo2, Author
Schüth, Ferdi1, Author              
Weidenthaler, Claudia1, Author              
Affiliations:
1Research Department Schüth, Max-Planck-Institut für Kohlenforschung, Max Planck Society, ou_1445589              
2Department of Materials Engineering and Industrial Technologies, University of Trento, via Mesiano, 77-38123 Trento, Italy, ou_persistent22              

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 Abstract: The gold−zirconia yolk−shell system is an interesting catalyst for CO oxidation. The size distribution of the gold nanoparticles is very narrow, and they are well separated from each other also after treatment at high temperature, which is due to their encapsulation in crystalline zirconia hollow spheres. Because this allows thermal and chemical treatment without affecting the size distribution, different defect structures of the gold nanoparticles can be induced, and the effect on catalytic activity can be investigated. Line profile analysis of the powder diffraction data based on the whole powder pattern modeling approach was used to determine the domain size distribution and lattice defects present in this two-phase system. The influence of different diffractometer setups on the results of the line profile analysis was also investigated. Variation of the chemical and thermal treatment procedures allowed altering the microstructure of the system. The resulting catalysts showed substantial variation in the activity for CO oxidation. Lower dislocation densities and less stacking faults result in decreased catalytic activity. These contributions to activity could be studied without any superimposed size effect due to the constant gold particle sizes.

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Language(s): eng - English
 Dates: 2010-07-122010-10-212010-11-18
 Publication Status: Published in print
 Pages: 9
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1021/jp106436h
 Degree: -

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Title: The Journal of Physical Chemistry C
  Abbreviation : J. Phys. Chem. C
Source Genre: Journal
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Publ. Info: Washington, D.C. : American Chemical Society
Pages: - Volume / Issue: 114 (45) Sequence Number: - Start / End Page: 19386 - 19394 Identifier: ISSN: 1932-7447
CoNE: https://pure.mpg.de/cone/journals/resource/954926947766