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A rapid and effective method for evaluating the initial activity of Mo/HZSM-5 catalyst in the methane dehydroaromatization reaction at severe conditions

Paper ID Volume ID Publish Year Pages File Format Full-Text
51167 46833 2010 5 PDF Available
Title
A rapid and effective method for evaluating the initial activity of Mo/HZSM-5 catalyst in the methane dehydroaromatization reaction at severe conditions
Abstract

The very rapid deactivation behavior of Mo/HZSM-5 catalyst in the non-oxidative CH4 dehydroaromatization needs its cyclic or continuous regeneration operation in a practical reactor system. Design and operation of such a system requires knowledge of the kinetics of catalyst deactivation and its regeneration. The present work reports an easy, rapid and quantitative approach to follow the dynamic variation of the activity of Mo/HZSM-5 in the very initial stage of CH4 dehydroaromatization at severe conditions. This approach comprises an on-line sampling and storing of a reacted effluent into a number of volume-known loops at intervals from seconds to minutes, and an off-line analysis of the stored samples. With it a nearly continuous dynamic variation in outlet benzene concentration was observed in the first tens of minutes of the reaction for all tested catalysts with Mo loadings ranging from 1.0 to 10 wt.%. Quantitative comparison of the variation with that in the benzene formation rate measured using conventional on-line GC analysis further revealed that the variation actually exhibited the dynamic behavior of the benzene formation activity of catalyst. The approach was subsequently applied successfully to follow the intrinsic maximum activity of Mo/HZSM-5 at severe conditions and in periodic reaction–regeneration operation mode to collect kinetic data for the reactor design.

Graphical abstractFigure optionsDownload full-size imageDownload as PowerPoint slideResearch Highlights►On-line sampling and storing of the reacted effluent at desired time intervals. ►Off-line analysis of stored samples to measure variations in concentrations. ►Dynamic catalytic behaviors of Mo/HZSM-5 at various operating conditions. ►Application of the approach for studying the reaction kinetics over Mo/HZSM-5.

Keywords
Methane dehydroaromatization; Mo/HZSM-5; Maximum activity; Benzene
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A rapid and effective method for evaluating the initial activity of Mo/HZSM-5 catalyst in the methane dehydroaromatization reaction at severe conditions
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Publisher
Database: Elsevier - ScienceDirect
Journal: Catalysis Communications - Volume 12, Issue 2, 15 November 2010, Pages 127–131
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