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tert-Butylation of toluene over mordenite and cerium-modified mordenite catalysts

Paper ID Volume ID Publish Year Pages File Format Full-Text
44187 46007 2006 9 PDF Available
Title
tert-Butylation of toluene over mordenite and cerium-modified mordenite catalysts
Abstract

tert-Butylation of toluene with tert-butanol in the liquid phase was studied over large pore mordenite zeolite catalyst (H-MOR CBV 21A with Si/Al = 10.5) and over cerium-modified parent zeolite with 1–6 wt.% of cerium. The catalytic activity and para-selectivity of parent and cerium-modified H-mordenite catalysts is discussed. Non-modified H-MOR is catalytic active (66% conversion of toluene), with para-selectivity near 84% at 180 °C after 8 h. Cerium modification of parent mordenite by impregnation decreases catalytic activity but enhances and retains constant high para-selectivity (near 90%). Secondary reactions involved in the alkylation reaction are dealkylation of tert-butyltoluenes and isomerisation of 4-tert-butyltoluene to more stable 3-tert-butyltoluene. The positive influence of cerium modification of parent zeolite on transformation of 4-tert-butyltoluene was investigated. It was proved by 129Xe NMR spectroscopy that cerium/ceria is located on the external surface of H-mordenite, not inside the main channels. It was confirmed by XRD that after calcination at 500 °C in the flow of dry air cerium is in the form of cerium/ceria. tert-Butylation of toluene with tert-butanol over shape-selective mordenite catalysts can be an ecofriendly process for industrial preparation of 4-tert-butyltoluene which is important intermediate product for fine chemicals.

Keywords
TO, toluene; TBA, tert-butanol; TBTO, tert-butyltoluenes; XTO, conversion of TO; S4-TBTO, selectivity = (4-TBTO/∑TBTO) × 100Alkylation; tert-Butylation; Zeolite; Mordenite; 4-tert-Butyltoluene; para-Selectivity; Cerium/ceria modification
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tert-Butylation of toluene over mordenite and cerium-modified mordenite catalysts
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 299, 17 January 2006, Pages 122–130
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
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