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Intermolecular condensation of ethylenediamine to 1,4-diazabicyclo(2,2,2)octane over H-ZSM-5 catalysts: Effects of Si/Al ratio and crystal size

Paper ID Volume ID Publish Year Pages File Format Full-Text
42167 45913 2010 9 PDF Available
Title
Intermolecular condensation of ethylenediamine to 1,4-diazabicyclo(2,2,2)octane over H-ZSM-5 catalysts: Effects of Si/Al ratio and crystal size
Abstract

The intermolecular condensation of ethylenediamine (EDA) to 1,4-diazabicyclo [2.2.2] octane (DABCO) or triethylenediamine (TEDA) was conducted over H-ZSM-5 catalysts. The effects of reaction parameters, Al content and crystal size on the EDA condensation over H-ZSM-5 have been investigated. The H-ZSM-5 catalyst with a medium Al content (Si/Al = 110) and a small crystal size (ca. 100 nm) showed 99% EDA conversion and afforded a TEDA yield as high as 74% under optimized conditions. The mechanism for the H-ZSM-5-catalyzed condensation of EDA has also been considered. The framework Al-related Brønsted acid sites were assumed to contribute to selective intermolecular condensation of EDA to TEDA. The primary intermolecular condensation of EDA to piperazine (PIP) took place mainly inside the micropores of the MFI structure, while the secondary condensation of PIP with EDA to TEDA was favored by the acid sites located near the pore entrance and on the external surfaces of crystals.

Graphical abstractH-ZSM-5, which has nanosized crystals (100 nm) and a medium Al content corresponding to an Si/Al ratio of 110 catalyzes effectively the intermolecular condensation of EDA to TEDA, giving 99% EDA conversion and 74% selectivity to TEDA.Figure optionsDownload full-size imageDownload high-quality image (234 K)Download as PowerPoint slide

Keywords
Ethylenediamine; Triethylenediamine; Piperazine; Condensation; H-ZSM-5
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Intermolecular condensation of ethylenediamine to 1,4-diazabicyclo(2,2,2)octane over H-ZSM-5 catalysts: Effects of Si/Al ratio and crystal size
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 379, Issues 1–2, 15 May 2010, Pages 45–53
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