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Methylcyclohexane transformation over dealuminated HBEA samples: Mechanisms and active sites

Paper ID Volume ID Publish Year Pages File Format Full-Text
43958 45997 2006 10 PDF Available
Title
Methylcyclohexane transformation over dealuminated HBEA samples: Mechanisms and active sites
Abstract

Methylcyclohexane transformation was carried out at 450 °C over HBEA samples resulting from dealumination of the same parent HBEA zeolite by three different methods: steaming, treatment with aqueous solutions of hydrochloric acid or ammonium hexafluorosilicate. With all the samples, methane, C2–C4 and C7 alkenes, isomers and toluene appear as primary products, the other products C2–C4 alkanes, C5 and C6 alkenes and alkanes, benzene, xylenes and trimethylbenzenes being secondarily formed. These products were shown to result from two mechanisms: carbenium ion chain, protolytic cracking and dehydrogenation. The activities of all the HBEA samples for each of the processes were estimated. A linear correlation was found between the activity of the samples for the carbenium ion chain process and the square of the concentration of protonic sites, which suggests a demanding process. Furthermore a close similarity could be observed between the change of the protolytic activity and Lewis acidity of the HCl treated samples with their Al content. Strong protonic sites resulting from interaction of bridging OH groups with neighbouring Lewis species: structure defects and monomeric extraframework Al species were proposed to be the active sites.

Keywords
BEA zeolite; Dealumination; Methylcyclohexane; Cracking; Mechanisms
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Methylcyclohexane transformation over dealuminated HBEA samples: Mechanisms and active sites
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 301, Issue 1, 10 February 2006, Pages 96–105
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