Development of the local and average structure of a V-Mo-Nb oxide catalyst with Mo5O14-like structure during synthesis from nanostructured precursors

Beitrag in einer Fachzeitschrift


Details zur Publikation

Autorinnen und Autoren: Kardash TY, Plyasova LM, Kochubey DI, Bondareva VM, Neder R
Zeitschrift: Zeitschrift für Kristallographie
Verlag: WALTER DE GRUYTER GMBH
Jahr der Veröffentlichung: 2012
Band: 227
Heftnummer: 5
Seitenbereich: 288-298
ISSN: 0044-2968


Abstract


A combination of X-ray and neutron PDF measurements with powder diffraction and EXAFS data was used to determine the structures of a V-Mo-Nb-oxide catalyst and its poorly crystallized precursors that exhibit the strongest catalytic activities. The crystalline material belongs to space group P (4) over bar2(1)m, a = 22.8, c = 4.002, and is build up of pentagonal MeO7 bipyramids surrounded by edge sharing Me-octahedrons (Me = Mo, V, Nb). In the average structure all MeO7 units are at the same z-level, while the local structure analysis shows systematic shifts along [001]. Samples synthesized at 300 degrees C and 400 degrees C exhibit a nanostructure, whose local structure predates the final crystalline structure. Initial nanoparticles are spherical and grow predominantly along the c-axis. The successful analysis required a reverse analysis that took the crystalline material as starting model for the samples synthesized at lower temperatures.



FAU-Autorinnen und Autoren / FAU-Herausgeberinnen und Herausgeber

Neder, Reinhard Prof. Dr.
Professur für Allgemeine Mineralogie/Kristallographie


Einrichtungen weiterer Autorinnen und Autoren

Boreskov Institute of Catalysis / Институт катализа им. Г.К. Борескова


Zitierweisen

APA:
Kardash, T.Y., Plyasova, L.M., Kochubey, D.I., Bondareva, V.M., & Neder, R. (2012). Development of the local and average structure of a V-Mo-Nb oxide catalyst with Mo5O14-like structure during synthesis from nanostructured precursors. Zeitschrift für Kristallographie, 227(5), 288-298. https://dx.doi.org/10.1524/zkri.2012.1507

MLA:
Kardash, Tatyana Yu., et al. "Development of the local and average structure of a V-Mo-Nb oxide catalyst with Mo5O14-like structure during synthesis from nanostructured precursors." Zeitschrift für Kristallographie 227.5 (2012): 288-298.

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