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Catalytic behaviour of bifunctional pumice-supported and zeolite/pumice hybrid catalysts for n-pentane hydroisomerization

Paper ID Volume ID Publish Year Pages File Format Full-Text
43381 45967 2008 8 PDF Available
Title
Catalytic behaviour of bifunctional pumice-supported and zeolite/pumice hybrid catalysts for n-pentane hydroisomerization
Abstract

A series of phillipsite(zeolite)-rich pumice-based supports with different acidity, Si/Al ratios and textural properties were prepared by acid leaching using hydrochloric acid. The NH3-TPD profiles, chemical composition and nitrogen adsorption–desorption isotherms pointed out that textural and acidity properties depend largely on the acidification treatment conditions. Bifunctional catalysts based on platinum supported over protonated pumice have been prepared by ethanol impregnation and tested in n-pentane hydroisomerization. Very low conversions and yields to isopentane have been obtained. The small size of phillipsite channels, lower than the pentane molecule and the intermediate products, may be hindering the access of these molecules to the acidic sites, contributing to their low activity in the target reaction. However, the catalysts constituted by a physical mixture of pumice-supported platinum, with protonated commercial zeolites (H-Mordenite or H-ZSM-5), widely used for light paraffin isomerization, resulted in higher isopentane yields than the bifunctional commercial zeolite-based catalysts. These results are explained by the greater accessibility of metal sites in a wider pore support and by the lesser blocking of the acid surface placed in the zeolite micropores.

Graphical abstractThe catalysts constituted by a physical mixture of pumice-supported platinum, with protonated commercial zeolites (H-Mordenite or H-ZSM-5), widely used for light paraffin isomerization, resulted in higher isopentane yields than the bifunctional commercial zeolite-based catalysts. These results are explained by the greater accessibility of metal sites in a wider pore support and by the lesser blocking of the acid surface placed in the zeolite micropores. Figure optionsDownload full-size imageDownload as PowerPoint slide

Keywords
Pumice; Mordenite; ZSM-5; Platinum; n-Pentane hydroisomerization
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Catalytic behaviour of bifunctional pumice-supported and zeolite/pumice hybrid catalysts for n-pentane hydroisomerization
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 350, Issue 1, 15 November 2008, Pages 38–45
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