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Pt catalysts supported on β zeolite ion-exchanged with Cr(III) for hydroisomerization of n-heptane

Paper ID Volume ID Publish Year Pages File Format Full-Text
42396 45923 2009 6 PDF Available
Title
Pt catalysts supported on β zeolite ion-exchanged with Cr(III) for hydroisomerization of n-heptane
Abstract

A series of Pt catalysts supported on Hβ zeolite ion-exchanged with Cr(III) were prepared, characterized by ICP, XRD, BET, NH3-TPD, H2-TPR and H2-chemisorption techniques, and evaluated in hydroisomerization of n-heptane with an atmospheric fixed-bed flow reactor. Pt catalyst supported on Hβ zeolite exhibits both lower selectivity to isomerized products and lower conversion of n-heptane than the counterparts supported on Cr(III)-exchanged Hβ zeolite. The optimal composition for Cr-bearing catalysts is 0.4 wt.% of Pt loading and 0.7 wt.% of Cr loading. This catalyst proves to be highly efficient in the hydroisomerization of n-heptane, giving a very high selectivity to isomerized products: 95.4% coupled with a high conversion of n-heptane: 72.1%. The substantial promotion effect of ion-exchanged Cr(III) species is discussed in relation to catalyst physicochemical properties.

Graphical abstractFor hydroisomerization of n-heptane, Hβ supported Cr catalyst shows very low conversion (☆) and isomerization selectivity (★). However, when Cr is introduced into Hβ supported Pt catalysts by Cr(III) ion-exchange, remarkable increases in conversion (□) and selectivity to isomerized products (▾) are obtained. The promotion effect of Cr arises from the increased number of strong acid sites, improved Pt dispersion, and enhanced reducibility of Pt.Figure optionsDownload full-size imageDownload as PowerPoint slide

Keywords
Hydroisomerization of n-heptane; β Zeolite; Bifunctional catalyst; Pt; Cr
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Pt catalysts supported on β zeolite ion-exchanged with Cr(III) for hydroisomerization of n-heptane
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 371, Issues 1–2, 15 December 2009, Pages 142–147
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
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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