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Ring contraction and selective ring opening of naphthenic molecules for octane number improvement

Paper ID Volume ID Publish Year Pages File Format Full-Text
43598 45978 2007 13 PDF Available
Title
Ring contraction and selective ring opening of naphthenic molecules for octane number improvement
Abstract

Different catalytic strategies have been evaluated to maximize the production of non-aromatic compounds with high octane number, starting from naphthenic molecules, which are typically obtained from the saturation of aromatics. The research octane number (RON), the motor octane number (MON), and the specific volume of the product mixtures were evaluated in each case. The product distribution obtained on acidic and Pt-containing zeolites was investigated in the temperature range 533–563 K in the presence of hydrogen at a total pressure of 2 MPa. It was found that skeletal isomerization (ring contraction) was the primary reaction in both HY and Pt/HY catalysts. The presence of Pt was found to enhance the stability of the catalyst, but also greatly altered the distribution of RC products, enhancing 1,1-dimethylcyclopentane. This enhancement can be explained in terms of a higher rate of hydride transfer caused by the presence of the metal. Evaluation of the octane numbers of the product indicated that a mixture of RC products results in rather high RON, but the MON and specific volume were about the same as that of the feed. To improve MON and specific volume an Ir/SiO2 catalyst with high hydrogenolysis activity was added to realize the ring opening (RO). The combination of RC and RO was tested on physical mixtures and segregated beds of Pt/HY and Ir/SiO2 catalysts in order to optimize the production of the iso-alkanes with highest octane number. It was found that with segregated catalyst beds, a better control of the selective breaking of CC bonds of RC isomers can be achieved, which optimizes octane number and specific volume.

Graphical abstractDifferent catalytic strategies involving the use of Pt/HY and Ir/SiO2 catalysts have been evaluated to maximize the production of non-aromatic compounds with high octane number, starting from naphthenic molecules, which are typically obtained from the saturation of aromatics. The research octane number (RON), the motor octane number (MON), and the specific volume of the product mixtures were evaluated in each case.Figure optionsDownload full-size imageDownload as PowerPoint slide

Keywords
Methylcyclohexane; Ring opening; Ring contraction; Cracking; Gasoline; Octane number; RON; MON; Pt; HY zeolite; Ir/SiO2
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Ring contraction and selective ring opening of naphthenic molecules for octane number improvement
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 325, Issue 1, 30 May 2007, Pages 175–187
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