Abstract: The effect of gadolinium additives on the morphology, phase composition, and catalytic properties of MoVSbNbGdOx/SiO2 catalysts in the oxidative dehydrogenation of ethane to ethylene (ODE) is studied. It is shown that gadolinium concentration has a significant effect on the catalytic properties. At an optimum gadolinium content (Gd/Mo = 0.01–0.015), an increase in catalytic activity and ethylene selectivity is observed: at a temperature of 400°C, the ethylene yield achieves 72%, the ethane conversion is higher than 91%, and the ethylene selectivity is higher than 79%. According to X-ray diffraction analysis and scanning and transmission electron microscopy, the main component of the catalyst is the M1 phase stabilized both in the bulk and on the surface of SiO2 particles. The modification of the catalyst with gadolinium significantly affects the morphology of the M1 phase particles. At an optimum gadolinium content, heat treatment leads to the formation mostly of M1 phase particles with a needle-like morphology and the most developed [001] plane emerging on the surface, which exhibit the maximally high activity in ODE. The M1 phase particles with this morphology are mostly stabilized in the bulk of porous spherical SiO2 particles; therefore, they do not undergo strong agglomeration and sintering. A smaller portion of the M1 phase particles with a plate-like morphology, which exhibit a lower catalytic activity, as well as the M2 phase particles, are stabilized on the outer surface of the SiO2 particles. In the catalyst containing no Gd additives, M1 phase particles with a plate-like morphology are mostly formed; this factor leads to a decrease in the catalyst activity. The synthesized catalyst exhibits a longterm stable on-stream behavior in the reaction medium without a deterioration of the properties.

Cite: Zenkovets G.A. , Shutilov A.A. , Bondareva V.M. , Sobolev V.I. , Prosvirin I.P. , Suprun E.A. , Ishchenko A.V. , Marchuk A.S. , Tsybulya S.V. , Gavrilov V.Y.
Effect of Gadolinium Additives on the Active Phase Morphology and Physicochemical and Catalytic Properties of MoVSbNbGdOx/SiO2 Catalysts in the Oxidative Dehydrogenation of Ethane to Ethylene
Kinetics and Catalysis. 2022. V.63. N6. P.732–746. DOI: 10.1134/S0023158422060179 WOS Scopus РИНЦ AN OpenAlex

Original: Зенковец Г.А. , Шутилов А.А. , Бондарева В.М. , Соболев В.И. , Просвирин И.П. , Супрун Е.А. , Ищенко А.В. , Марчук А.С. , Цыбуля С.В. , Гаврилов В.Ю.
Влияние добавки гадолиния на морфологию активной фазы, физико-химические и каталитические свойства катализатора MoVSbNbGdOx/SiO2 в реакции окислительного дегидрирования этана в этилен
Кинетика и катализ. 2022. Т.63. №6. С.774-788. DOI: 10.31857/S0453881122060181 РИНЦ OpenAlex

Dates:

Submitted:	Apr 4, 2022
Accepted:	Jul 27, 2022
Published print:	Dec 1, 2022
Published online:	Mar 6, 2023

Identifiers:

Web of science:	WOS:000944025100012
Scopus:	2-s2.0-85149930170
Elibrary:	50425267
Chemical Abstracts:	2023:464333
OpenAlex:	W4323339419

Citing:

DB	Citing
Scopus	1
Elibrary	1
OpenAlex	1
Web of science	1

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