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Characterization and activity of zinc acetate complex supported over functionalized silica as a catalyst for the production of isopropyl palmitate

Paper ID Volume ID Publish Year Pages File Format Full-Text
44341 46016 2006 10 PDF Available
Title
Characterization and activity of zinc acetate complex supported over functionalized silica as a catalyst for the production of isopropyl palmitate
Abstract

A hybrid silica gel-‘succinic acid-zinc acetate’ catalyst (SG-SAZnA) was synthesized for the esterification of palmitic acid with isopropanol. The scanning electron microscope (SEM) and X-ray diffraction (XRD) studies indicated the presence of a crystalline compound formed by the interaction of the surface succinic acid fragment and zinc acetate. The high thermal stability and catalytic activity of SG-SAZnA catalyst excluded the possibility of breaking of the bond between SA and the silica gel surface. The SG-SAZnA catalyst was mildly acidic, its surface area and average pore size were in the range of mesopores. The kinetics of the esterification of palmitic acid and isopropanol catalyzed by SG-SAZnA catalyst was studied in a stirred batch reactor for the synthesis of isopropyl palmitate. The effects of stirrer speed, reaction temperature, feed molar ratio, catalyst loading and reusability of the catalyst were evaluated. The SG-SAZnA catalyst activity was found to be higher compared to the hybrid silica gel–zinc acetate material (SG-ZnA) for the esterification reaction. The catalyst showed a long life and could be reused for various catalytic cycles without deactivation. The experimental reaction rates were correlated using different rate models. These models include the pseudo-homogeneous, Eley–Rideal and Langmuir Hinshelwood Hougen Watson models. The Langmuir Hinshelwood Hougen Watson (LHHW) model fitted the experimental kinetic data well over a wide range of operating conditions. The reaction parameters obtained from LHHW model were useful for the design of a catalytic distillation column for the production of isopropyl palmitate.

Keywords
Zinc acetate-supported catalyst; Catalytic activity; Esterification; Isopropyl palmitate; Characterization; Kinetic modeling
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Characterization and activity of zinc acetate complex supported over functionalized silica as a catalyst for the production of isopropyl palmitate
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 297, Issue 1, 4 January 2006, Pages 8–17
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