Properties of a Multicomponent MoVSbNbCeOx/SiO2 Catalyst in the Oxidative Dehydrogenation of Ethane to Ethylene

A multicomponent MoVSbNbCeO x /SiO 2 oxide catalyst exhibiting high catalytic activity in the oxidative dehydrogenation of ethane to ethylene is synthesized by spray drying of a suspension of aqueous solutions of the precursors and the subsequent heat treatment in He at 350 and 600°C. At a temperatu...

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Bibliographic Details
Published in:Kinetics and catalysis 2021, Vol.62 (2), p.315-327
Main Authors: Zenkovets, G. A., Shutilov, A. A., Bondareva, V. M., Dovlitova, L. S., Sobolev, V. I., Marchuk, A. S., Tsybulya, S. V., Prosvirin, I. P.
Format: Article
Language:English
Subjects:
Aqueous solutions
Catalysis
Catalysts
Catalytic activity
Chemical synthesis
Chemistry
Chemistry and Materials Science
Conversion
Dehydrogenation
Ethane
Ethylene
Heat treatment
Phase composition
Physical Chemistry
Selectivity
Silicon dioxide
Spray drying
Tellurium
Toxicity
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Summary:A multicomponent MoVSbNbCeO x /SiO 2 oxide catalyst exhibiting high catalytic activity in the oxidative dehydrogenation of ethane to ethylene is synthesized by spray drying of a suspension of aqueous solutions of the precursors and the subsequent heat treatment in He at 350 and 600°C. At a temperature of 400–450°С in a wide ethane conversion range, the catalyst exhibits a fairly high activity and ethylene selectivity. In the presence of this catalyst, the maximum ethylene yield achieves 74% (ethane conversion of 91%, ethylene selectivity of 81.5%); this value significantly exceeds the yield in the presence of Sb-containing catalysts known from the literature. The catalyst exhibits a long-term stable on-stream behavior under reaction medium conditions without any change in the phase composition and a deterioration of the catalytic characteristics. It is shown that the catalytic properties of the synthesized catalyst are comparable to the properties of MoVTeNbO x , which is one of the best catalysts for this process. However, the use of a Te-containing catalyst is limited, because tellurium exhibits a high toxicity and volatility during the synthesis and use of the catalysts. According to X-ray diffraction analysis, the main components of the catalyst are M1 and M2 phases stabilized on a SiO 2 surface. The HRTEM data show that a structural feature of the catalyst is the presence of an interface formed by the coherently intergrown crystals of the M1 and M2 phases.
ISSN:0023-1584
1608-3210
DOI:10.1134/S0023158421020117