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Time resolved selectivity for unsteady regimes in catalytic petroleum chemistry

Paper ID Volume ID Publish Year Pages File Format Full-Text
55654 47060 2011 6 PDF Available
Title
Time resolved selectivity for unsteady regimes in catalytic petroleum chemistry
Abstract

Selectivity in petroleum chemistry generally means multi-compound product compositions, distributed over a wide range from, e.g. hydrocarbon gases up to vapors of high boiling substances – thus providing analytical problems. Temporal resolution is required for investigating unsteady regimes of reaction, as pertinent during self-organization of catalytic processes or phenomena of catalyst deactivation. It is also of interest in temperature programmed operation as for catalyst regeneration, pyrolysis of organic materials as oil shale and biomass or TPD of pollutants recovered on adsorbents. For temporal resolution instant ampoule sampling has been developed. Ampoule samples are taken from the (hot) gaseous product flow in pre-evacuated glass ampoules in less than 1 s and stored without compositional changes for later GC-analysis. High resolution gas chromatography has been developed, starting at −80 °C for the separation of light gases and ending at, e.g. 250 °C for separating high boiling compounds (e.g. vapors of hydrocarbons C20). In the article, initial selectivity changes in Fischer–Tropsch synthesis (referring to chain growth, chain branching and olefin reactions, as caused by self-organization of the FT-regime) and also thermal regeneration of a HZSM5 catalyst used for methanol conversion at low temperature (referring to reactivation by de-alkylation of bulky benzene derivates) are being presented.

Graphical abstractFigure optionsDownload full-size imageDownload high-quality image (117 K)Download as PowerPoint slideHighlights► Instant ampoule sampling and related gas chromatography has been developed. ► Time-resolved selectivity (0.1 s) of complex reaction products is achieved. ► Unsteady regimes in catalytic petroleum chemistry are studied. ► Self-organization in Fischer–Tropsch synthesis has been investigated. ► Mechanism of catalyst coking during methanol conversion on zeolites resolved.

Keywords
Ampoule sampling; Catalysis; Unsteady regimes; Time resolved selectivity; Fischer–Tropsch synthesis; TPD-selectivity
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Time resolved selectivity for unsteady regimes in catalytic petroleum chemistry
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Publisher
Database: Elsevier - ScienceDirect
Journal: Catalysis Today - Volume 178, Issue 1, 15 December 2011, Pages 151–156
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
Get Full-Text Now
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