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Vapor-phase isomerization of endo-tetrahydrodicyclopentadiene to its exo isomer over zeolite catalysts

Paper ID Volume ID Publish Year Pages File Format Full-Text
41256 45882 2011 5 PDF Available
Title
Vapor-phase isomerization of endo-tetrahydrodicyclopentadiene to its exo isomer over zeolite catalysts
Abstract

Vapor-phase isomerization of endo-tetrahydrodicyclopentadiene (endo-THDCPD) to exo-THDCPD over zeolite catalysts (HY, H-USY, Hβ, HZSM-5 and HMOR) was studied as a green synthesis route for exo-THDCPD. The HY and H-USY catalysts showed catalytic activity while the Hβ, HZSM-5 and HMOR catalysts did not. Higher yield of exo-THDCPD was obtained over the H-USY catalyst than that over the HY catalyst, attributing to the presence of strong acid sites and mesopores in the H-USY catalyst. The yield of exo-THDCPD obtained via vapor-phase isomerization was better than that reported via liquid-phase isomerization. In addition to the properties of the catalyst itself, the vapor-phase isomerization process of endo-THDCPD was also affected by the reaction temperature, the concentration of endo-THDCPD, the contact time and the time on stream. Under the optimized conditions, high purity (>98 wt%) exo-THDCPD was directly obtained without any separation processes. Although deactivation of the catalyst with the time on stream was observed, the activity could be recovered easily via regeneration in air.

Graphical abstractFigure optionsDownload full-size imageDownload high-quality image (129 K)Download as PowerPoint slideHighlights▶ H-USY is an efficient catalyst for vapor-phase isomerization of endo- to exo-THDCPD. ▶ The conditions for isomerization in vapor phase are milder than those in liquid phase. ▶ Exo-THDCPD with purity of ≥98 wt% can be directly obtained from the reactor outlet.

Keywords
Tetrahydrodicyclopentadiene; Vapor-phase isomerization; Ultra-stable Y zeolite; JP-10
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Vapor-phase isomerization of endo-tetrahydrodicyclopentadiene to its exo isomer over zeolite catalysts
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 402, Issues 1–2, 31 July 2011, Pages 196–200
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