Investigating the Sole Olefin-Based Cycle in Small-Cage MCM-35-Catalyzed Methanol-to-Olefins Reactions

Small-pore zeolites catalyze the methanol-to-olefins (MTO) reaction via a dual-cycle mechanism, encompassing both olefin- and aromatic-based cycles. Zeolite topology is crucial in determining both the catalytic pathway and the product selectivity of the MTO reaction. Herein, we investigate the mecha...

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Vydané v:Molecules (Basel, Switzerland) Ročník 29; číslo 9; s. 2037
Hlavní autori: Liu, Zhaohui, Mao, Min, Yangcheng, Ruixue, Lv, Shuang
Médium: Journal Article
Jazyk:English
Vydavateľské údaje: Switzerland MDPI AG 01.05.2024
Predmet:
Hydrocarbons
MCM-35 zeolite
mechanism
Methanol
methanol to olefins
olefin-based cycle
Propagation
Propylene
Raw materials
Zeolites
China
olefin-based cycle
mechanism
methanol to olefins
MCM-35 zeolite
ISSN:1420-3049, 1420-3049
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Shrnutí:Small-pore zeolites catalyze the methanol-to-olefins (MTO) reaction via a dual-cycle mechanism, encompassing both olefin- and aromatic-based cycles. Zeolite topology is crucial in determining both the catalytic pathway and the product selectivity of the MTO reaction. Herein, we investigate the mechanistic influence of MCM-35 zeolite on the MTO process. The structural properties of the as-synthesized MCM-35 catalyst, including its confined cages (6.19 Å), were characterized, confirming them as the catalytic centers. Then, the MTO reactions were systematically performed and investigated over a MCM-35 catalyst. Feeding pure methanol to the reactor yielded minimal MTO activity despite the formation of some aromatic species within the zeolite. The results suggest that the aromatic-based cycle is entirely suppressed in MCM-35, preventing the simultaneous occurrence of the olefin-based cycle. However, cofeeding a small amount of propene in methanol can obviously enhance the methanol conversion under the same studied reaction conditions. Thus, the exclusive operation of the olefin-based cycle in the MTO reaction, independent of the aromatic-based cycle, was demonstrated in MCM-35 zeolite.
Bibliografia:ObjectType-Article-1
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ISSN:1420-3049
1420-3049
DOI:10.3390/molecules29092037