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The effects of carbonaceous species in HZSM-5 on methanol-to-olefin process

Paper ID Volume ID Publish Year Pages File Format Full-Text
40981 45873 2012 6 PDF Available
Title
The effects of carbonaceous species in HZSM-5 on methanol-to-olefin process
Abstract

An improved transient 12CH3OH/13CH3OH switching method is used at steady-state conditions with a computer-controlled multi-position valve to distinguish the formation paths of propene and ethene over HZSM-5 zeolites in the methanol-to-olefin process for understanding the effects of Si/Al ratios and the carbonaceous deposited in the zeolites. By carefully analyzing the isotope distribution in products in short time intervals at transient state, it is demonstrated that a fraction of the carbonaceous species is active and participates in the methanol reactions. On high silica zeolite, the active carbonaceous species are responsible for the production of ethene, while propene is formed mainly through rapid alkene methylation in zeolite channels. High Si/Al ratio of zeolite leads to high ratio of propene to ethene in products of methanol-to-olefin process.

Graphical abstractFigure optionsDownload full-size imageDownload high-quality image (153 K)Download as PowerPoint slideHighlights► Transient reaction of 12CH3OH/13CH3OH switching is more carefully analyzed. ► Propene and ethene are formed through different paths over high silica HZSM-5. ► High Si/Al ratio of zeolite leads to high propene/ethene ratio in products. ► A partial carbonaceous species in zeolite is active for methanol reactions.

Keywords
Carbonaceous species; Acid density; HZSM-5; MTO; P/E ratio
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The effects of carbonaceous species in HZSM-5 on methanol-to-olefin process
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volumes 421–422, 16 April 2012, Pages 108–113
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
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Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us