Dimethyl Ether to Olefins on Hybrid Intergrowth Structure Zeolites

A series of catalysts based on hybrid intergrowth structure zeolites MFI-MEL, MFI-MTW, and MFI-MCM-41 are studied in the reaction of olefins synthesis from dimethyl ether at atmospheric pressure and a temperature of 340 °C. The total acidity of hybrid zeolite-based catalysts is shown to correlate wi...

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Bibliographic Details
Published in:Catalysts 2023-03, Vol.13 (3), p.570
Main Authors: Magomedova, Maria V., Starozhitskaya, Anastasiya V., Davidov, Ilya A., Tsaplin, Dmitry E., Maximov, Anton L.
Format: Article
Language:English
Subjects:
Acids
Alkenes
Catalysts
Chemical reactions
Chemical synthesis
Dehydration
Dimethyl ether
hybrid zeolites
Hydrocarbons
intergrowth structure
light olefins
MEL
Methanol
Methyl ether
MTO reaction
Olefins
Reagents
Spectrum analysis
Topology
Zeolites
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Summary:A series of catalysts based on hybrid intergrowth structure zeolites MFI-MEL, MFI-MTW, and MFI-MCM-41 are studied in the reaction of olefins synthesis from dimethyl ether at atmospheric pressure and a temperature of 340 °C. The total acidity of hybrid zeolite-based catalysts is shown to correlate with their activity. However, the use of zeolite with the structure MFI-MCM-41, which is characterized by a high content of medium acid sites, additionally catalyzes the methanol dehydration reaction, resulting in a decrease in the observed DME conversion. The obtained product distributions are brought into correlation with the texture of catalysts. It is shown that the use of hybrid zeolites does not change the mechanism of reaction, but the structural features of zeolites influence the priority of the competing MTO reactions: high ethylene yield is observed for catalysts with high micropore volume. The topology of the hybrid zeolite has been shown to influence the hydrogen transfer reaction rate, but not to change the isomerizing activity of the catalyst.
ISSN:2073-4344
2073-4344
DOI:10.3390/catal13030570