In situ Study of Structural Transformations of the Active Phase of VMoNbTeO Catalysts under Reduction Conditions Full article
| Journal |
Journal of Structural Chemistry
ISSN: 0022-4766 , E-ISSN: 1573-8779 |
||||
|---|---|---|---|---|---|
| Output data | Year: 2019, Volume: 60, Number: 10, Pages: 1599-1611 Pages count : 13 DOI: 10.1134/S0022476619100056 | ||||
| Tags | M1 phase; VMoNbTeO catalysts; X-ray diffraction in situ | ||||
| Authors |
|
||||
| Affiliations |
|
Funding (1)
| 1 | Russian Science Foundation | 17-73-20073 |
Abstract:
VMoNbTeO catalysts show high activity in the reactions of selective oxidation of ethane and propane. Time-resolved X-ray diffraction is used to study structural transformations of a mixed oxide with the composition (TeO)(0.18)(Mo0.7V0.22Nb0.08)(20)O56 and the structure of the active M1 phase upon heating in a hydrogen atmosphere (1% H2 in helium). It is shown that the structure of the M1 phase is destroyed in the presence of a reducing agent above 480 degrees C. The process is accompanied by structural distortions, diminishing of the size of crystalline blocks, elimination of tellurium (due to the reduction and sublimation), and the reduction by molybdenum and vanadium cations. As a result, VMoNb oxides with a disordered structure are formed and rapidly crystallized at T > 480 °C into the rutile-type monoclinic oxide (Mo,V,Nb)O2 with a variable composition. X-ray photoelectron spectroscopy and transmission electron microscopy data confirm heterogeneous compositions of oxides formed by the decomposition of the initial phase. The surface of the formed particles is enriched with vanadium and niobium present in the composition of the oxides with disordered structure.
Cite:
Kardash T.Y.
, Marchuk A.S.
, Ishchenko A.V.
, Simanenko A.A.
, Lazareva E.V.
, Svintsitskiy D.A.
In situ Study of Structural Transformations of the Active Phase of VMoNbTeO Catalysts under Reduction Conditions
Journal of Structural Chemistry. 2019. V.60. N10. P.1599-1611. DOI: 10.1134/S0022476619100056 WOS Scopus РИНЦ AN OpenAlex
In situ Study of Structural Transformations of the Active Phase of VMoNbTeO Catalysts under Reduction Conditions
Journal of Structural Chemistry. 2019. V.60. N10. P.1599-1611. DOI: 10.1134/S0022476619100056 WOS Scopus РИНЦ AN OpenAlex
Original:
Кардаш Т.Ю.
, Марчук А.С.
, Ищенко А.В.
, Симаненко А.А.
, Лазарева Е.В.
, Свинцицкий Д.А.
In situ исследование структурных трансформаций активной фазы катализаторов VMoNbTeO в восстановительных условиях
Журнал структурной химии. 2019. Т.60. №10. С.1664-1677. DOI: 10.26902/JSC_id47985RSCI РИНЦ OpenAlex
In situ исследование структурных трансформаций активной фазы катализаторов VMoNbTeO в восстановительных условиях
Журнал структурной химии. 2019. Т.60. №10. С.1664-1677. DOI: 10.26902/JSC_id47985RSCI РИНЦ OpenAlex
Dates:
| Submitted: | Apr 8, 2019 |
| Accepted: | Apr 22, 2019 |
| Published print: | Oct 1, 2019 |
| Published online: | Nov 5, 2019 |
Identifiers:
| Web of science: | WOS:000494481800005 |
| Scopus: | 2-s2.0-85074637627 |
| Elibrary: | 41682459 |
| Chemical Abstracts: | 2019:2102900 |
| OpenAlex: | W2983027873 |