NAP-XPS and in situ XRD Study of the Stability of Bi-Modified MoVNbTeO Catalysts for Oxidative Dehydrogenation of Ethane Full article
| Journal |
Applied Catalysis A: General
ISSN: 0926-860X , E-ISSN: 1873-3875 |
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| Output data | Year: 2019, Volume: 579, Pages: 141-150 Pages count : 10 DOI: 10.1016/j.apcata.2019.04.027 | ||||||
| Tags | Bismuth; Catalyst modification; EXAFS; In situ; M1 phase; MoVNbTe; NAP-XPS; ODE; Oxidative dehydrogenation of ethane; Six-membered channel; Slurry method; Tellurium | ||||||
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| Affiliations |
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Funding (1)
| 1 | Russian Science Foundation | 17-73-20073 |
Abstract:
This work presents the investigation of Bi-modified MoVNbTeO catalysts for oxidative dehydrogenation of ethane (ODE) using the combination of NAP-XPS, in situ XRD and XANES/EXAFS techniques. It was found that introduction of Bi improves the tolerance of catalysts toward severe reaction conditions (high temperature and/or enhanced ethane/oxygen ratio) resulting in a significant decrease in the degree of deactivation. In accordance with NAP-XPS data, the surface/subsurface Te concentration was maintained for Bi-containing MoVNbTeO catalysts even after treatment with a reducing reaction mixture (C2H6/O-2 > 3) at temperatures up to 460 degrees C. In the case of the unmodified catalyst, such treatment resulted in the surface/subsurface depletion of Te due to the reduction into the Te degrees state followed by its sublimation into the gas phase. The incorporation of Bi within extended six-membered channels of the M1 structure was suggested based on XANES/EXAFS data. Such incorporation probably influences the mobility of Te within channels, resulting in the limitation of Te diffusion from the particle bulk to the surface. The improved tolerance of catalytically active M1 phase toward severe reaction conditions was confirmed by in situ XRD data during heating in a mixture of 8 wt % C2H6/He.
Cite:
Svintsitskiy D.A.
, Kardash T.Y.
, Lazareva E.V.
, Saraev A.A.
, Derevyannikova E.A.
, Vorokhta M.
, Šmíd B.
, Bondareva V.M.
NAP-XPS and in situ XRD Study of the Stability of Bi-Modified MoVNbTeO Catalysts for Oxidative Dehydrogenation of Ethane
Applied Catalysis A: General. 2019. V.579. P.141-150. DOI: 10.1016/j.apcata.2019.04.027 WOS Scopus РИНЦ OpenAlex AN
NAP-XPS and in situ XRD Study of the Stability of Bi-Modified MoVNbTeO Catalysts for Oxidative Dehydrogenation of Ethane
Applied Catalysis A: General. 2019. V.579. P.141-150. DOI: 10.1016/j.apcata.2019.04.027 WOS Scopus РИНЦ OpenAlex AN
Dates:
| Submitted: | Mar 1, 2019 |
| Accepted: | Apr 20, 2019 |
| Published online: | Apr 22, 2019 |
| Published print: | Jun 5, 2019 |
Identifiers:
| ≡ Web of science: | WOS:000470954100016 |
| ≡ Scopus: | 2-s2.0-85065018839 |
| ≡ Elibrary: | 38694352 |
| ≡ OpenAlex: | W2940784763 |
| ≡ Chemical Abstracts: | 2019:850742 |