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Production of aromatics from heavier n-paraffins on hybrid cracking-reforming catalyst

Paper ID Volume ID Publish Year Pages File Format Full-Text
55512 47056 2012 7 PDF Available
Title
Production of aromatics from heavier n-paraffins on hybrid cracking-reforming catalyst
Abstract

Selective production of aromatics from the heavier n-paraffins was studied on nano-structured (ns) catalysts consisting of ns alumina and MFI-type H-galloaluminosilicate (H-GaAlMFI) zeolite. Performance of the hybrid H-GaAlMFI zeolite catalyst with ns Al2O3 was improved considerably from those of the zeolite sole catalyst and USY or H-ZSM-5 catalyst. It was observed that in the n-C16H34 conversion, the product selectivity for aromatics (including intermediate olefins and byproducts) and the degradation rate depended on either the ratios of Ga/(Ga + Al) and Si/(Ga + Al) in the zeolite component or on the co-existence of ns Al2O3. It was found that aromatics could be produced selectively by controlling the reaction time. In regards to the catalytic active sites, the ns species at the zeolite surface layer and the surface distributions were confirmed by X-ray photoelectron spectroscopy with the Ar-etching method. It was determined that non-framework Ga species existed as Ga oxides after calcining. It was also revealed that the ns alumina had an important role in forming the ns species of non-framework Ga by extracting it from the zeolite framework and stabilizing it as an ns oxide at the zeolite particle surface which opened into the nano-space.

Graphical abstractFigure optionsDownload full-size imageDownload high-quality image (152 K)Download as PowerPoint slideHighlights► H-GaAlMFI zeolite is effective to aromatic production from heavier n-paraffins. ► The zeolite is promoted by hybridization with nano-structured alumina. ► Ga of the zeolite is extracted near the surface from the framework by calcination. ► The Ga extraction is promoted by nano-structured alumina to be stabilized. ► The highly dispersed Ga protected by the alumina is active, selective and stable.

Keywords
Heavier n-paraffins; Cracking-reforming; Hybrid H-GaAlMFI zeolite catalyst; Aromatics
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Production of aromatics from heavier n-paraffins on hybrid cracking-reforming catalyst
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Publisher
Database: Elsevier - ScienceDirect
Journal: Catalysis Today - Volume 185, Issue 1, 20 May 2012, Pages 119–125
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