Research output: Contribution to journal › Article › peer-review
NAP-XPS and in situ XRD study of the stability of Bi-modified MoVNbTeO catalysts for oxidative dehydrogenation of ethane. / Svintsitskiy, Dmitry A.; Kardash, Tatyana Yu; Lazareva, Evgeniya V. et al.
In: Applied Catalysis A: General, Vol. 579, 05.06.2019, p. 141-150.Research output: Contribution to journal › Article › peer-review
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TY - JOUR
T1 - NAP-XPS and in situ XRD study of the stability of Bi-modified MoVNbTeO catalysts for oxidative dehydrogenation of ethane
AU - Svintsitskiy, Dmitry A.
AU - Kardash, Tatyana Yu
AU - Lazareva, Evgeniya V.
AU - Saraev, Andrey A.
AU - Derevyannikova, Elizaveta A.
AU - Vorokhta, Mykhailo
AU - Šmíd, Břetislav
AU - Bondareva, Valentina M.
N1 - Publisher Copyright: © 2019 Elsevier B.V.
PY - 2019/6/5
Y1 - 2019/6/5
N2 - 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 (C 2 H 6 /O 2 >3) at temperatures up to 460 °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° 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 % C 2 H 6 /He.
AB - 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 (C 2 H 6 /O 2 >3) at temperatures up to 460 °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° 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 % C 2 H 6 /He.
KW - Bismuth
KW - Catalyst modification
KW - EXAFS
KW - In situ
KW - M1 phase
KW - MoVNbTe
KW - NAP-XPS
KW - ODE
KW - Oxidative dehydrogenation of ethane
KW - Six-membered channel
KW - Slurry method
KW - Tellurium
KW - SELECTIVE OXIDATION
KW - M2 PHASES
KW - CRYSTAL-STRUCTURE
KW - ACTIVE-SITES
KW - HYDROTHERMAL SYNTHESIS
KW - LIGHT ALKANES
KW - MOVTE(SB)NBO M1 PHASE
KW - SURFACE DYNAMICS
KW - MOVTENB OXIDE CATALYSTS
KW - PROPANE OXIDATION
UR - http://www.scopus.com/inward/record.url?scp=85065018839&partnerID=8YFLogxK
U2 - 10.1016/j.apcata.2019.04.027
DO - 10.1016/j.apcata.2019.04.027
M3 - Article
AN - SCOPUS:85065018839
VL - 579
SP - 141
EP - 150
JO - Applied Catalysis A: General
JF - Applied Catalysis A: General
SN - 0926-860X
ER -
ID: 20046993