Abstract: Development of catalysts based on nanomaterials and characterization of their structure has become the great deal of scientific attention in material science in the last time. The present study is devoted to the investigation of structural features of an active phase in V-Mo-Nb-O catalysts for selective transformations of ethane to ethylene, acetic acid and acetonitrile [1-2]. The catalysts were synthesized by mixing aqueous solutions of ammonium paramolybdate, ammonium metavanadate and niobium oxalate with further drying and calcination in air at 400 ℃ . Samples were analyzed by XRD, HREM and EXAFS. The active component of these catalysts is a triple compound with Me5O14-like structure (Me=Mo, V, Nb) and variable composition [1-2]. The active catalyst is XRD amorphous and characterized by the presence of both narrow reflections at d = 4.00, 2.00 Å, and broad reflection at d = 3.40 Å. HREM investigation reveal 1D-ordared nanostructure with block size <5 nm and interlayer distance of 0.40 nm. In perpendicular plane, networks are built by disordered Me5O14-like subunits, which consist of MeO7-bipiramides connected by edge with five octahedra [3]. Model of active nanocrystalline phase was proposed according to HREM data, XRD pattern modeling by DFA method and local structure investigation by EXAFS.

Cite: Kardash T.U. , Plyasova L.M. , Bondareva V.M. , Cherepanova S.V. , Kochubey D.I.
Nanocrystalline Structure of an Active Phase in V-MoNb-O Catalysts for Ethane (Amm)oxidation
Acta Crystallographica Section A: Foundations and Advances (предыдущее название Acta Crystallographica Section A: Foundations of Crystallography). 2008. V.64. P11.05.79 :1-1. DOI: 10.1107/S0108767308082949 WOS РИНЦ OpenAlex

Dates:

Published print:

Aug 23, 2008

Identifiers:

Web of science:	WOS:000480420705101
Elibrary:	47691620
OpenAlex:	W2320526094

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