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Hydroisomerization activity and selectivity of n-dodecane over modified Pt/ZSM-22 catalysts

Paper ID Volume ID Publish Year Pages File Format Full-Text
43803 45989 2008 8 PDF Available
Title
Hydroisomerization activity and selectivity of n-dodecane over modified Pt/ZSM-22 catalysts
Abstract

The hydroisomerization of n-dodecane was investigated over Pt supported on unmodified ZSM-22 and on modified ZSM-22. The effect of ZSM-22 modification on Pt/ZSM-22 acidity and on catalytic performance is discussed in detail using MAS NMR and FT-IR results. The ZSM-22 was modified by NH4+ ion-exchange, HNO3 or (NH4)2SiF6 treatment, and by steam treatment in order to tune the acidity of the catalysts. The unmodified ZSM-22 catalyst shows very low activity in the hydroisomerization of n-dodecane due to the lowest acidity. The conversions of the catalysts for the reaction of n-dodecane are increased from 1.1% to 96.6% at 300 °C as the acidity of the ZSM-22 is increased from 0.043 mmol/g to 0.329 mmol/g, but the isomerization selectivity is reduced. The catalyst that was modified by the combination of NH4+ ion-exchange and (NH4)2SiF6 treatment possesses the Brönsted acid sites with medium strength and shows the high isododecane selectivity (88.0%) under high conversion (87.5%) at 300 °C.

Graphical abstractThe hydroisomerization of n-dodecane was investigated for Pt catalysts supported on unmodified ZSM-22 and on modified ZSM-22. The ZSM-22 was modified by NH4+ ion-exchange, HNO3 or (NH4)2SiF6 treatment, and by the hydrothermal treatment. The catalyst modified by the combination of NH4+ ion-exchange and (NH4)2SiF6 treatment possesses the Brönsted acid sites with medium strength and shows the high isododecane selectivity (88.0%) under high conversion (87.5%) at 300 °C. Figure optionsDownload full-size imageDownload as PowerPoint slide

Keywords
Hydroisomerization; n-Dodecane; ZSM-22; FT-IR; NMR
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Hydroisomerization activity and selectivity of n-dodecane over modified Pt/ZSM-22 catalysts
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 335, Issue 1, 1 February 2008, Pages 20–27
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
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Any Questions? feel free to contact us