What question did this study set out to answer?

To investigate how hierarchical morphologies and mesoscopic compositional gradients of framework aluminum in MFI-type zeolites influence catalytic activity, mass transport, and lifetime in the methanol-to-hydrocarbons reaction.

August 15, 2026ACS Catalysis

Impact of Hierarchical ZSM-5 Catalyst Structure and Compositional Gradients on the Methanol-to-Hydrocarbons Reaction

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Authors

SCSambita ChoudhuryMartin Luther King, Jr. Multi-Service Ambulatory Care Center KSKumari ShilpaMartin Luther King, Jr. Multi-Service Ambulatory Care Center MMMonica J. Mendoza‐CastroMartin Luther King, Jr. Multi-Service Ambulatory Care Center

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Implication

Experimental study demonstrates that finned and core-shell zeolite architectures improve catalyst lifetime in methanol-to-hydrocarbon conversion, highlighting the impact of acid site distribution.

Key Points

To investigate how hierarchical morphologies and mesoscopic compositional gradients of framework aluminum in MFI-type zeolites influence catalytic activity, mass transport, and lifetime in the methanol-to-hydrocarbons reaction.
Synthesized finned and core-shell MFI-type zeolites with distinct active (ZSM-5) and inactive (silicalite-1) regions using secondary growth techniques.
Evaluated catalytic performance, turnover capacity, and deactivation behavior during the methanol-to-hydrocarbons (MTH) reaction.
Characterized framework aluminum site geometry, coordination distortion, and Brønsted acidity using Al X-ray absorption spectroscopy, solid-state NMR, and chemical acid titrations.
Finned zeolite catalysts achieved consistently higher cumulative turnovers and longer operational lifetimes than core-shell counterparts, driven by dense localized pore openings that enhance molecular transport.
Incorporating silicon-rich exterior fins or shells mitigated external coking through surface passivation and improved mass transfer compared to conventional ZSM-5.
Secondary growth introduced a distribution of tetrahedral aluminum sites with distorted Al–O bonds, showing that Brønsted acid site strength is non-uniform across hierarchical zeolite frameworks.

Cite This Study

Choudhury et al. (2026) studied this question.

synapsesocial.com/papers/6a8019fe75c2e31742c865a8 https://doi.org/10.1021/acscatal.6c03462

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Implication

Experimental study demonstrates that finned and core-shell zeolite architectures improve catalyst lifetime in methanol-to-hydrocarbon conversion, highlighting the impact of acid site distribution.

Impact of Hierarchical ZSM-5 Catalyst Structure and Compositional Gradients on the Methanol-to-Hydrocarbons Reaction

Discussion

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Implication

Key Points

Cite This Study

Impact of Hierarchical ZSM-5 Catalyst Structure and Compositional Gradients on the Methanol-to-Hydrocarbons Reaction

Discussion

Member takes

Implication

Key Points

Cite This Study

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