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The effect of pre-coking and regeneration on the activity and stability of Zn/ZSM-5 in aromatization of 2-methyl-2-butene

Paper ID Volume ID Publish Year Pages File Format Full-Text
55643 47060 2011 7 PDF Available
Title
The effect of pre-coking and regeneration on the activity and stability of Zn/ZSM-5 in aromatization of 2-methyl-2-butene
Abstract

A new method to modify the acidity of zeolite was attempted to improve the activity and stability of Zn/ZSM-5 in aromatization of 2-methyl-2-butene. Pre-coking and regeneration in the presence of O2 at 773 K generated a large exothermic heat in a short time, which resulted in the thermal dealumination of framework aluminum that acted as a Brønsted acid site. The treatment had a profound effect on the acid properties of the catalyst as probed by 27Al MAS NMR, temperature-programmed desorption of ammonia, and pyridine FTIR. The results showed that the concentration of oxygen in regeneration step had critical effects on the acidity and stability of Zn/ZSM-5. Thus improvement of lifetime of Zn/ZSM-5 in aromatization of 2-methyl-2-butene was achieved without deteriorating activity and selectivity by the pre-coking and controlled regeneration by oxygen.

Graphical abstractFigure optionsDownload full-size imageDownload high-quality image (182 K)Download as PowerPoint slideHighlights► Zn/ZSM-5 was used for the aromatization of 2-metheyl-2-butene. ► Oxidative regeneration showed enhanced stability and the same conversion compared with the fresh catalyst. ► Changes in structure and acidity of zeolite during regeneration were revealed by various characterization methods. ► The enhanced stability resulted from the preferential removal of strong Brønsted acid sites.

Keywords
Aromatization; 2-Methyl-2-butene; Dealumination; Acidity; Zn/ZSM-5
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The effect of pre-coking and regeneration on the activity and stability of Zn/ZSM-5 in aromatization of 2-methyl-2-butene
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Publisher
Database: Elsevier - ScienceDirect
Journal: Catalysis Today - Volume 178, Issue 1, 15 December 2011, Pages 72–78
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