The evolution of the M1 local structure during preparation of VMoNbTeO catalysts for ethane oxidative dehydrogenation to ethylene

Kardash, T. Yu; Lazareva, E.  V.; Svintsitskiy, D. A.; Ishchenko, A. V.; Bondareva, V. M.; Neder, R. B.

doi:10.1039/c8ra06424e

Title: The evolution of the M1 local structure during preparation of VMoNbTeO catalysts for ethane oxidative dehydrogenation to ethylene

Journal Article · 21 October 2018 · RSC Advances

DOI: https://doi.org/10.1039/c8ra06424e · OSTI ID:1761439

^[1]; Lazareva, E. V. ^[1]; Svintsitskiy, D. A. ^[1]; Ishchenko, A. V. ^[1]; Bondareva, V. M. ^[1]; Neder, R. B. ^[2]

Boreskov Inst. of Catalysis, Novosibirsk (Russia)
Friedrich-Alexander Univ. of Erlangen-Nuremberg (Germany)

The so-called M1 phase (the common formula (TeO)_x(Mo, V, Nb)₅O₁₄) is a very promising catalyst for ethane oxidative dehydrogenation (ODE). It shows 90% selectivity to ethylene at 78% ethane conversion (400 °C, contact time – 5.5 s). The active crystal structure is formed under certain synthetic conditions in VMoNbTe mixed oxides. This paper is devoted to the analysis of how the local and average structure of the M1 phase is developed during the synthesis and what happens at particular synthetic steps. The analysis of the local structure was performed using the EXAFS and pair distribution function (PDF) methods. The EXAFS analysis of the initial VMoTe water solution and VMoNbTe slurry showed that Anderson-type heteropoly anions are formed in the solution and are preserved after fast spray-drying of the slurry. Nb cations do not enter the structure of the polyanions, but form an extended hydrated oxide matrix, where distorted NbO₆ and NbO₇ polyhedrons are connected to each other. The hydrated oxide matrix with captured polyanions provides the compositional homogeneity of the precursor. The distances in the second coordination shell are redistributed after thermal treatment at 310 °C. After being heated at T > 350°, the local structure of the M1 phase is organized and pentagonal domains are formed. These domains consist of a NbO₇ pentagonal bipyramid and five MeO₆ adjacent octahedra (Me = Mo, V). In the first stages, the building blocks are stacked along the [001] direction. The crystallization process results in the connection of the pentagonal domains to the extended polygonal grid. The formation of the regular grid with TeO_x containing channels is accompanied by the increase in ethane conversion and ethylene selectivity of the catalysts.

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Research Organization:: Argonne National Laboratory (ANL), Argonne, IL (United States). Advanced Photon Source (APS)

Sponsoring Organization:: Russian Science Foundation (RSF); USDOE Office of Science (SC)

OSTI ID:: 1761439

Journal Information:: RSC Advances, Journal Name: RSC Advances Journal Issue: 63 Vol. 8; ISSN 2046-2069

Publisher:: Royal Society of ChemistryCopyright Statement

Country of Publication:: United States

Language:: ENGLISH

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