NAP-XPS and in situ XRD Study of the Stability of Bi-Modified MoVNbTeO Catalysts for Oxidative Dehydrogenation of Ethane | Sciact - CRIS-system of Boreskov Institute of Catalysis

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

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

Authors

Svintsitskiy Dmitry A. ^1,2 , Kardash Tatyana Yu. ^1,2 , Lazareva Evgeniya V. ¹ , Saraev Andrey A. ¹ , Derevyannikova Elizaveta A. ¹ , Vorokhta Mykhailo ³ , Šmíd Břetislav ³ , Bondareva Valentina M. ¹

Affiliations

1	Boreskov Institute of Catalysis, Pr. Lavrentieva 5, Novosibirsk, 630090, Russian Federation
2	Novosibirsk State University, St. Pirogova 2, Novosibirsk, 630090, Russian Federation
3	Charles University, Department of Surface and Plasma Science, Faculty of Mathematics and Physics, V Holešovičkách 2, Prague 8, 180 00, Czech Republic

Funding (1)

Russian Science Foundation

17-73-20073

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.

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 AN OpenAlex

Submitted:	Mar 1, 2019
Accepted:	Apr 20, 2019
Published online:	Apr 22, 2019
Published print:	Jun 5, 2019

Web of science:	WOS:000470954100016
Scopus:	2-s2.0-85065018839
Elibrary:	38694352
Chemical Abstracts:	2019:850742
OpenAlex:	W2940784763

DB	Citing
Scopus	25
Web of science	21
Elibrary	20
OpenAlex	25