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Synthesis of commercial important diethyl phthalate over Al-, Fe- and Al,Zn-MCM-41 molecular sieves

Paper ID Volume ID Publish Year Pages File Format Full-Text
44363 46019 2006 12 PDF Available
Title
Synthesis of commercial important diethyl phthalate over Al-, Fe- and Al,Zn-MCM-41 molecular sieves
Abstract

The synthesis of diethyl phthalate (DEP) from phthalic anhydride (PAH) and ethanol (EtOH) has been carried out successfully on aluminum-, iron- and zinc- containing MCM-41 molecular sieves. These catalysts were prepared by the hydrothermal method. The catalysts have been characterized by the XRD, BET (surface area) and 29Si and, 27Al MAS-NMR techniques. The catalytic activity of these molecular sieves has been tested by the above-mentioned reaction, by the batch processes at 135, 150 and 175 °C. Both conversion and selectivity increased with an increase in temperature and mole ratio (EtOH/PAH). The activity of these catalysts followed the order: Al-MCM-41 (Si/Al = 112) > Fe-MCM-41 (Si/Fe = 115) > Al-MCM-41 (Si/Al = 70) > Al-MCM-41 (Si/Al = 52) > Fe-MCM-41 (Si/Fe = 61) > Al, Zn-MCM-41 (Si/Al + Zn = 104) > Al-MCM-41 (Si/Al = 30). The reaction yielded both monoethyl phthalate (MEP) and diethyl phthalate (DEP). The nature of the catalyst sites has been clarified using water as an impurity. The weight of the catalyst was optimized at 0.06 g. Some times hydrophilic and some times hydrophobic nature of the catalyst been explained by the influence of water; the external surface acidity also facilitates the reaction. This has been confirmed by the addition test reaction.

Keywords
MCM-41; Conversion; Selectivity; Hydrophobicity; Hydrophilicity; Diethyl phthalate
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Synthesis of commercial important diethyl phthalate over Al-, Fe- and Al,Zn-MCM-41 molecular sieves
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 307, Issue 2, 3 July 2006, Pages 245–256
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
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Price was $35.95
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